BENDIX SINGLE ANCHOR PIN CAM BRAKE Specifications
Contents
1. Figure 31 21 TECH TIPS Air Wedge Brakes AIR WEDGE BRAKES TROUBLESHOOTING GUIDE PROBLEM CAUSES INSUFFICIENT BRAKE Brakes were not adjusted properly at initial installation Automatic adjusters are not functioning properly Brake block 1s worn out Brake block is improper low friction Grease on brake block Plungers are frozen in the housings Air chambers are not bottomed in housings Leak in air system Incorrect wedge angle l 2 3 4 6 Ji 8 9 l BRAKES GRABBING Poor delivery of service air Grease or dirt on brake block Mis alignment of wedge and plunger parts Brake block is improper Binding of brake shoes due to improper assembly distorted shoes or worn out return springs BRAKE DRAGGING Spring brake power spring not releasing fully Low spring brake hold off pressure Improper connection of service lines Weak brake shoe return springs Leaking air lines or seals Loose wheel bearings Wedge shaft out of push rod socket due to improper assembly On Stopmaster Plastic wedge guide is missing or broken Plungers are binding due to improper lubrication Broken wedge return spring and or cotter pin SPRING BRAKES DON T HOLD Air chamber tube is not bottomed in housing Spring brake power spring is broken Power spring is not fully uncaged Caging bolt is damaged Brakes are improperly adjusted Hold off air is not fully releasing ae a oe 22 TECH TIPS Air W2. 10 TECH TIPS AUTOMATIC SLACK ADJUSTERS Product Code 108 FUNCTION As with a manual slack adjuster Automatic Slack Adjusters multiply the linear force exerted by the air chamber and convert it to rotational force to activate the foundation brake components The chamber force is multiplied by a factor depending on slack adjuster arm length e 5 1 2 6 6 2 Through the use of a fixed control point bracket or link and a one way clutch mechanism the Automatic Slack Adjuster maintains proper lining to drum clearance This eliminates the need for constant manual brake adjustment Automatic Slack Adjusters provide consistent brake performance throughout lining life better balance between individual brakes and assist in keeping brake stroke within the legal limits Through normal brake operation the fixed control point moves a rack in the slack adjuster body As the clutches are engaged on regular release the worm screw is turned by the clutch and rack The worm screw then turns the worm wheel adjusting the foundation brakes This will continue until lining to drum contact is achieved At the time of contact the clutch to worm shaft is disengaged stopping worm wheel rotation as shown in Figure 13 External Bracket Actuation During brake release the actuation rod rotates the adjuster wheel in the slack adjuster body As the clutch is engaged the worm screw is turned by the adjuster wheel The worm
3. Bendix and Rockwell air chambers cannot be mixed due to differences in the depth of the push rods See Figure 36 Figure 36 Rockwell Stopmaster air chambers can be identified by a red or black plastic wedge guide over the end of the air chamber push rod SIVHEIUIOD vs COMPETITION e All components must pass Euclid s strict quality control inspection e Euclid has the highest order fill rate in the industry You get the parts you need when you need them e Euclid publishes the easiest to use catalog in the industry e Euclid has the technical staff on hand to answer questions concerning EUCLID either Bendix or Stopmaster Wedge Brakes 95 TECH TIPS AIR HOSE Product Code 130 ML N N NA NI N M FUNCTION Air brake tubes and hoses are the arteries of a vehicles air system Their purpose is to transfer air from the air tanks to valves and brake chambers They are designed to carry the correct volume and pressure to assure balanced effective braking Tubing and hose are used for different purposes even though they perform the same task Tubing is manufactured out of stiff materials like copper and nylon and are used on the vehicle where no movement occurs Hose is manufactured to work with the vehicles suspension connections and points of movement Layers of synthetic rubber and synthetic reinforcement give hose its strength and flexibility See Figure 37 Synthetic Rubber Layer Synthetic Rubb
4. FOR FRUEHAUF roller end view Use std camshaft 1 16 E 8922 ROCKWELL Q PLUS roller end view Use ext life camshaft E 5503 EATON TOP SPEC ES FOR A ROCKWELL roller end view Use std OR ext life camshaft SPICER XL 11 4 roller end view Use ext life camshaft BRAKE BLOCK DRILL PATTERN Lefthand shown 28 Holes 7 8 Thick 10 9 Rivets 28 Holes 13 16 Thick 10 9 Rivets 28 Holes 7 8 Thick 10 9 Rivets 28 Holes 13 16 Thick 10 9 Rivets FMSI 4701 24 Holes 7 8 Thick 10 9 Rivets TECH TIPS CAMSHAFT REPAIR KITS Product Code 104 FUNCTION amp TYPES Euclid Camshaft Repair Kits are designed to restore camshaft operation to its original equipment specifications providing the camshaft itself is not excessively worn Euclid Camshaft Repair Kits come in many configurations to fit a wide variety of brake applications They contain enough camshaft bushings seals washers and lock rings to service one complete axle two camshafts GENERAL INSPECTION RECOMMENDATIONS At each vehicle lubrication interval any missing or loose camshaft lock rings and washers should be replaced On self contained tractor brakes make sure that the chassis lubrication is not leaking between the camshaft tube and the brake spider Replace the gasket if this occurs At each brake reline certain in
5. Synthetic Reinforcement 1 amp 4 Spirals of Reinforcement Improper Crimp Figure 38 26 TECH TIPS Air Hose REPLACEMENT The leaking or in need of replacement hose should be removed immediately Removal and replacement is normally easy when a few guidelines are followed 1 Do not splice patch or cover area in need of replacement 2 Replace hose with a DOT approved hose of same length and inside diameter Changing diameter and length of hose will affect brake timing 3 Route hose properly to avoid wear through problems This routing should take into consideration the empty and loaded conditions 4 Do not bend or twist hose Twisting or excessive bends preload tension into the hose causing premature failure 5 Use correct inserts ferrules nuts and hose when making a replacement hose Combining the incorrect parts could cause assembly failure EUCLID vs COMPETITION e Over 160 separate part numbers available e All Euclid hose is DOT approved e Hose assemblies are available boxed or unboxed e Hose assembly configurations available with one fixed and one swivel end or both ends swivel 27 OTHER EUCLID TECHNICAL TRAINING MODULES AVAILABLE MODULE ONE ONE AIR SYSTEMS Includes Compressors Governors Air Dryers Air Tanks Air Valves Air Hoses MODULE TWO HYDRAULIC BRAKES Includes Hydraulic Wheel Cylinders Master Cylinder Hydraulic Disc Brake Rotors Hydraulic Disc Brake Calipers M
6. There are two basic areas of failure related to service and combination chambers Mechanical and pneumatic Both types of failures require the spring brake to be repaired or replaced WARNING Failure to comply with all instructions for mechanical release of the spring may cause death severe personal injury and or property damage To replace the parking side of a brake chamber follow these general instructions 1 Always block wheels to prevent vehicle rollaway when replacing spring brake diaphragms If spring brake shows structural damage DO NOT cage the spring and DO NOT attempt to service it Replace the complete unit To prevent severe personal injury when removing an uncaged spring brake from a vehicle cut the service push rod with an acetylene cutting torch making sure to relieve all force on it 3 Never strike any part of the spring brake with a hammer or any other heavy object structural damage may result 4 Do not drop spring brake as the compression spring may forcefully release 5 If air pressure is used to aid in the caging process do not tighten release tool nut more than finger tight The air pressure in the emergency chamber must always be exhausted after the spring has been mechanically caged prior to any disassembly 6 On a sealed spring brake the emergency diaphragm cannot be replaced See Figure 20 Replace the complete piggyback unit SERVICE BRAKE RELEASED SERVICE BRAKE RELEASED ce QO Service Return Service R
7. brakes 14 TECH TIPS AIR BRAKE CHAMBERS Product Code 131 THE BRAKE CHAMBER The Brake Chamber converts compressed air into mechanical energy This conversion is accomplished by supplying compressed air against a diaphragm The diaphragm then pushes against a paddle with an attached push rod and Clevis The force of compressed air is now converted into mechanical braking force See Figure 18 Braking force is discontinued when the compressed air is exhausted from the Brake Chamber See Figure 19 BRAKE APPLIED Diaphragm A Return Spring Compressed Ch II P CO Compressed A Air In Camshaft Gi Rotation oi gt BRAKE UNAPPLIED Diaphragm l ent a Return Spring Extended rd GEI Tee Compressed Air Exhausted Camshaft Rotation Figure 19 The Brake described above is a service brake chamber See Figure 18 amp 19 The combination brake chamber is another type of chamber The combination chamber combines a parking brake piggybacked on a service brake See Figure 20 The parking brake uses a very powerful compression spring to apply the brakes Pressurized air against the diaphragm and plate is used to compress the spring WARNING Failure to comply with all instructions for mechanical release may result in the forceful release of the spring and cause death severe personal injury and or property damage 15 TECH TIPS Air Brake Chambers GENERAL INSTRUCTIONS FOR SEALED TYPE SPRING BRAKES
8. screw then turns the worm wheel adjusting the foundation brakes This will continue until lining to drum contact is achieved At the time of contact the clutch to worm shaft is disengaged stopping worm wheel rotation as shown in Figure 14 Link Rod Actuation External Bracket Actuation Link Rod Activation Housing Slack Body FAST One Way Clutch ae N ag LE ee Na Worm Gear 9 Return Springs Worm Wheel if A D Vi Control Plate Figure 13 Figure 14 TECH TIPS Automatic Slack Adjusters ADJUSTING SENSING METHODS 1 Stroke Sensing In sensing push rod stroke several variables come into play Push rod stroke becomes longer when any one or a combination of the following are present camshaft bushing wear air chamber bracket deflection or camshaft twist Once a longer stroke is sensed the adjusting mechanism in the slack is activated reducing the lining to drum clearance There is a possibility that with wear push rod stroke could become longer than the legal limits while lining to drum clearance is correct In a stroke sensing Automatic Slack Adjuster this stroke activates the adjusting mechanism further reducing lining to drum clearance and over adjusting the brake 2 Clearance Sensing The majority of Automatic Slack Adjusters produced today have lining to drum clearance sensing as the activation method Clearance sensing slacks employ a one way clutch and load sensing mechanism which engages only u
9. within specifications by adding or removing camshaft spacer washers Note A minimum of one camshaft spacer washer on either side of the slack adjuster is required If proper axial movement cannot be achieved without removing one or Note maximum both of these spacer washers a slightly longer camshaft deflection must be used Proper preventive maintenance and periodic service must Eaton No less than 005 13mm be performed to insure camshafts and bushings will Not more than 045 1 14mm provide good service during the life of the brake reline Rockwell Not more than 060 1 52mm The intervals in which this service is performed depends on the vehicle application and road conditions Each maintenance supervisor must design a preventive maintenance program that meets his own requirements Euclid recommends that camshaft bushings be lubricated a minimum of every six months for on highway vehicles and every four months for off highway vehicles Figure 12 EWGULID vs COMPETITION e Over 400 Camshafts O ne of the largest all makes Camshaft offerings in the aftermarket e Heat treated camshaft heads and splines to prevent premature wear e All Camshafts are individually boxed to prevent damage to splines e Camshaft Repair Kits contain all necessary parts to reoush one complete axle NOTE For greater brake efficiency Euclid strongly recommends that new camshaft bushings and seals be installed when replacing camshafts
10. ATION STANDARD vs EXTENDED LIFE STAN DARD BRAKES STANDARD Lefthand shown FMSI 4311J 28 Holes 3 4 Thick 10 8 Rivets FMSI 4515E 32 Holes 3 4 Thick 10 8 Rivets FMSI 4515E 32 Holes 3 4 Thick 10 8 Rivets FMSI 4515E 32 Holes 3 4 Thick 10 8 Rivets FMSI 4515E 10 8 Rivets Figure 7 BRAKE BLOCK DRILL PATERN S CAM HEAD HOW TO USE THIS CHART e Compare Brake Shoe Profiles e Compare Table End Views e Compare Brake Block Drill Patterns e Determine Which Type of Camshaft Each Brake Shoe Uses TABLE BRAKE TYPE anchor end view Use std OR ext life camshaft FRUEHAUF XEM as roller end view 59 64 11 16 E 3920 ROCKWELL Q TT roller end view Use std OR 11 4 ext life camshaft ROCKWELL Q FOR FRUEHAUF roller end view 1 Use std OR ext life camshaft SPICER SI FAST CHANGE roller end view Use std OR ext life camshaft 11 4 E 2778 Full color reprints of this Chart A 505 are available BRAKE TYPE EXTENDED LIFE BRAKES EXTEN DED LIFE S CAM HEAD Standard brakes use stan dard OR extended life camshafts Most extended life brakes use ONLY extended life camshafts Fruehauf brakes use ONLY standard camshafts TABLE EATON ES anchor end view Use ext life camshaft EATON TOP SPEC ES
11. ODULE THREE WHEEL ATTACHING PARTS Includes Disc Wheel Parts Spoke Wheel Parts MODULE FOUR SUSPENSIONS Includes Four Spring Suspensions Neway Air Suspensions Mack Camel Back Spring Suspension U Bolts Uni Rods Maxi Rods Air Springs Shock Absorbers an ArvinMeritor brand SERVING THE HEAVY DUTY INDUSTRY SINCE 1939 Euclid Industries LLC 6660 Beta Drive Cleveland Ohio 44143 2321 440 461 4300 e Fax 440 461 4307 Euclid Industries Canada Ltd Toronto e Edmonton e Montreal www arvinmeritor com Copyright 1999 Euclid Industries LLC TT 7 4 99 e Printed in USA MODULE FIVE FRONT END PARTS Includes King Pin Sets Tie Rod Ends Drag Links Light Duty Front End Parts MODULE SIX AIR CONDITIONING AND HEATING PARTS MODULE SEVEN ELECTRICAL COMPONENTS Includes Alternators Starters MODULE EIGHT ENGINE COOLING SYSTEMS Includes Water Pumps WWW EUCLIDIND COM For more information on Euclid s other Tech Tips visit our new Web site Distributed By
12. OEM specifica tions in order to provide the vehicle owner longer life and improved performance on his investment in brake hardware e A higher quality brake kit will cost more initially but will pay off in the long run with less wear on brake lining and drums e The popularity of automatic slack adjusters and non asbestos brake lining have increased the stress on foundation brake hardware T hus more heavy duty high quality parts such as Euclid s are required to meet today s stress loads e Euclid offers 80 cataloged brake kits covering a broad range of heavy duty truck and trailer air brake applications e Euclid offers the finest and most detailed catalog information on air brake kits A photograph and list of components is shown for each kit to ease in identification TECH TIPS CAMSHAFTS Product Code 103 FUNCTION Air Brake Camshafts are part of a series of fulcrums and levers that transfer brake application force through the brake system Force from the air brake chamber pushes the arm of the slack adjuster The slack adjuster mated to the Camshaft by splines rotates the camshaft The center of the camshaft becomes the fulcrum When the S head of the Camshaft rotates it delivers the brake force to the roller ends of the brake shoes and pushes them into contact with the brake drum TYPES Camshafts are designed for specific brake applications They are available in a variety of lengths bushing journal di
13. TECH TIPS Includes Foundation Air Brake Hardware Kits Camshafts Camshaft Repair Kits Automatic Slack Adjusters Air Brake Chambers Air Wedge Brakes Air Hose an ArvinMeritor brand TECH TIPS FOUNDATION AIR BRAKE HARDWARE KITS Product Code 101 FUNCTION Air brake hardware kits are designed to provide all the components required to achieve maximum lining life stopping power and stability of the foundation brake at each reline Each hardware kit is designed for a specific application correct component identification is critical Euclid Master Catalog 100 provides critical dimensions of all components for identification purposes Wall charts are also provided to aid in brake shoe identification TYPE In the aftermarket air brake hardware kits are available in various quality levels and number of components in each kit The end user should pay attention to these differences to assure that he is purchasing a quality kit from a reputable manufacturer The old saying You get what you pay for certainly applies to brake kits Euclid air brake hardware kits are available with a variety of components from minor kits which range from some containing only high wear components to the major kits which repair one complete wheel These major repair kits are Euclid s MEGA PLUS Maximum Life MEGA Premium Quality and STOPMATE Standard Quality brake kits Euclid MEGA PLUS kits are complete kits designed for today s extend
14. ameters head sizes number of splines and spline diameters Camshaft lengths are determined by the location of the air brake chamber Head sizes are determined by the type and size of the brake A 15 diameter steering axle cam commonly uses a small flat type camshaft head The 12 4 diameter trailer brakes use small but deeper S shaped camshaft heads The 16 2 and 18 steering drive or trailer axle brakes use large S shaped camshaft heads on standard applications Late model camshaft heads have evolved into the extended life design These new heads for 16 2 application utilize deeper pockets for use with the thicker brake blocks while using standards drums Care must be taken when identifying these two camshaft types See Figure 7 Standard head camshafts cannot be used when using extended life brake shoes When using extended life camshafts standard or extended life brake block can be used Always use the same style camshaft on both sides of an axle to promote a balanced brake condition As shown in Figure 6 the direction the camshaft head rotates to apply the brakes determines if the camshaft is right hand or left hand The side of the vehicle the Camshaft is located on has no bearing on whether the camshaft is right hand or left hand BRAKE CAMSHAFT BRAKE CAMSHAFT LEFT HAND RIGHT HAND SN View From Head End Figure 6 6 TECH TIPS BRAKE SHOE IDENTIFICATION Product Code 103 BRAKE IDENTIFIC
15. bushing hole in the brake spider for wear If the hole is worn and cannot provide an adequate press fit to the bushing the spider must be replaced Special tools such as E 3864B Brake Spider Alignment Tool are also available to check the alignment of the anchor pin holes in the spider If the spider holes do not meet specifications the brake shoe will not be held square to the drum and the spider must be replaced Corrosion between standard mild steel anchor pin bushings and anchor pins is a common complaint Euclid supplies a stainless steel version of these bushings in its MEGA and MEGA PLUS kits to eliminate this problem NOTE Anti seize compound should be used in the assembly of anchor pins bushings regardless of which plating and material is being used in order to insure smooth rolling action and prevent corrosion Euclid s MEGA PLUS kits include a corrosion resistant non magnetic stainless bushings with a dimpled inner surface to hold antiseize lubricant in place BRAKE SHOE ROLLERS Brake shoe rollers transfer the force from the camshaft to the brake shoes As the rollers move up the ramps of the camshaft the brakes are applied Brake shoe rollers are manufactured in two major types smooth and knurled Knurled rollers like the diamond knurled designed rollers supplied by Euclid create a positive rolling action and when installed properly eliminate flat spot problems on the head of the camshaft Although knurled rollers may roll a patter
16. d service than S Cam brakes This issue of Tech Tips gives a brief description of Air Wedge Brakes Before attempting to service a Wedge Brake Euclid recommends that the mechanic obtain a copy of Bendix s Service Data Manual No SD 12 1 Wedge Brakes and or Rockwell s Field Maintenance Manual No 4R Stopmaster Brakes Rockwell Stopmaster Bendix TYPES There are two Air Wedge Brake systems currently in use Bendix and Rockwell Stopmaster The two are similar in Operation and contain the same basic components e Backing Plate or Spider e Plunger Housings e Automatic Adjuster Assemblies e Adjusting Plungers e Anchor Plungers e Wedge Assemblies e Air Chambers e Brake Shoes e Brake Shoe Return Springs The biggest difference between the two brake systems is in the design of the automatic adjuster assemblies 20 EUCLID TECH TIPS Air Wedge Bakes OPERATION When air is applied to the air chamber the air chamber push rod pushes a wedge between two rollers in the wedge assembly The rollers spread and push the plungers outward forcing the brake shoes into the brake drum Figure 29 As the brake lining contacts the drum both shoes are carried into the drum rotation This is called Wrap up The force of the wrap up causes the anchor plungers to reseat and absorb the brake torque When the brake is released the wedge assembly spring retracts the wedge from between the plungers The brake shoe return springs b
17. d short radius The short radius fits into the slot of the anchor plunger the long radius fits into the slot of the adjuster bolt head Stopmaster shoe webs are stamped with an arrow and the words FORWARD DRUM ROTATION The arrow points to the short radius of the web and indicates that the forward drum rotation is toward the anchor plungers See Figure 35 FORWARD RUM RO TATO Long BENDIX SHOE Radius STOPMASTER SHOE Radius Figure 34 Figure 35 BRAKE BLOCK When asbestos brake block was used the recommendations for wedge brakes was to use a GG rated friction material This is still recommended in Rockwell s Service Manual However with non asbestos brake block there are some friction materials rated FF that give the same or better stopping performance as the old GG asbestos materials Euclid recommends the use of its SD1 GG or MB23 FF rated brake block depending on the specific wedge brake application DO NOT use a combination brake block on wedge brakes BRAKE SHOE RETURN SPRINGS Brake shoe return springs should always be replaced when doing a wedge brake reline Brake shoe return springs are critical to the operation of wedge brake automatic adjusters and maintaining the correct lining to drum 36 GH Stopmaster Push Rod clearance Metal spring dampers on Bendix wedge brakes must be Bendix Push Rod used to prevent spring fatigue and premature spring failure 69 AIR CHAMBERS
18. dimensions To achieve the best brake performance old worn shoes must be discarded and replaced with new lined shoes Figure 1 Figure 2 Figure 3 Euclid E 3863 Brake Shoe Gauge 2 EUCUD weindex info weindex info TECH TIPS Foundation Air Brake Hardware Kits ANCHOR PINS Anchor pins position and maintain the position of the brake shoes Brake force is transferred from the shoes through the anchor pin to the brake spider As a result of normal movement and brake force anchor pins will wear As they wear they no longer maintain the proper position of the brake shoes This allows for unmatched lining to drum contact and inferior braking Rockwell s designed brakes P amp Q are manufactured with two replaceable anchor pins which because of wear must be replaced at each brake reline Euclid supplies all replaceable pins with a precision ground finish to provide the smoothest possible wear surface while other manufacturers often use a standard ungrounded finish on their anchor pins Eaton s non replaceable single anchor pin must be closely inspected for wear and roughness Make sure Eaton anchor pins are smooth and free of irregularities Eaton s specifications allow for up to 031 of wear before the entire brake spider must be replaced This 031 is the maximum wear limit however and wear in smaller amounts may also cause brake shoes to be positioned incorrectly and create unusual wear on the brake lining Roughness on anchor p
19. e foundation brake for problems such as worn bushings worn S cam surfaces flat spotted rollers etc Air Chamber Size Type Desired Stroke Type 30 Air Chamber 1 1 4 to 2 stroke with Type 24 Long Stroke 1 1 4 to 2 stroke 80 to 90 psi Type 20 24 Air Chamber 1 to 1 3 4 stroke Service Brake Type 9 12 Air Chamber 3 4 to 1 1 2 stroke Application The air chamber push rod stroke can be difficult to measure properly With a tape measure measure the movement of the push rod from the completely released position to the applied position 80 to 90 psi This movement can also be measured by marking the push rod where it exits the air chamber brake released then apply the brake and measure the distance from the mark to the face of the air chamber The control arm location or clevis position should be checked if the brakes have been running tight or the push rod stroke measurement is less than 1 1 4 on the rear axle or 3 4 on the steer axle If the stroke changes after a proper initial installation foundation brake components should be checked before replacing Automatic Slack Adjusters Look for worn camshaft bushing worn camshaft weak or broken return springs etc These components and their proper inspection and maintenance procedures can be seen in Euclid s training video Air Foundation Brakes The Hidden Challenge VIDEO 1 Euclid offers two Automatic Slack Adjusters Euclid Haldex and Crewson Brunner The features benefits and prop
20. ed service applications and provide for maximum life by using heavy duty shot peened return springs dimpled anchor pin bushings and antiseize lubricant Euclid MEGA heavy duty brake kits include all the needed components including anchor pins rollers heavy duty return springs spring and roller retainers washers lock rings and bushings Euclid STOPMATE brake kits also include all the components needed to repair one complete wheel but offer a standard quality level rather than a premium quality level with added durability In this issue of Tech Tips we will highlight most of these components their wear points and types available GENERAL INSPECTION RECOMMENDATIONS As foundation brake hardware wears brake shoe and lining wear is affected Brake lining wear patterns are a good place to start troubleshooting foundation brake hardware problems Euclid supplies a Wall Chart A 504 and a Service Bulletin B 20 which describes possible causes and solutions to the most common brake lining wear problems BRAKE SHOES Brake shoes need to be inspected for anchor pin connection wear See Figure 1 roller connection wear web straightness See Figure 2 stretch See Figure 3 and table flatness Several styles of tools to check these wear points are available individually or as one unit such as Euclid s E 3863 Brake Shoe Gauge Most brake shoe gauges are GO NO GO style and reject only those brake shoes which are worn beyond the minimum allowable
21. ed with back up protection Clevis control actuation reduces part number inventories and speeds installation sg Hexagon shaft has low rotational Heavy duty coil spring for torque for easy consistent gear set preload installation Housing made from modular cast iron or heat treated forging depending on part learing sensin number Clearing sensing clutch virtually eliminates unwanted brake adjustment Allinternal components made from high strength hardened alloy steel Figure 17 As the brakes are applied the Slack Adjuster s rotation moves the shoe and linings into contact with the brake drum This movement also lifts the actuation rod through a pre set free travel dimension that is the normal lining to drum running clearance Continuing the brake application rotates a one way clutch in its overriding mode and at the same time causes the large coil spring to deflect at a specific force This spring deflection allows the worm to move axially which releases the drive clutch and prevents unwanted brake adjustment from occurring As the brakes are released the large coil spring resumes its original load and position which allows the drive clutch to re engage Simultaneous to drive clutch re engagement if any lining wear has occurred the actuation rod rotates the one way adjusting clutch an amount proportional to the lining wear This motion rotates the worm worm wheel and S cam shaft resulting in adjustment of the
22. edge Brakes PROBLEM CAUSES BRAKES ARE FROZEN OR LOCKED UP UNEVEN BRAKING AUTOMATIC ADJUSTERS ARE NOT WORKING Spring brakes are not releasing Insufficient air pressure in chamber Air lines are not properly connected to the spring brake chamber Plungers are seized in housing Broken wedge return spring Connecting air lines to trailer are crossed Wedge shaft out of push rod socket due to improper assembly On Stopmaster Plastic wedge guide is missing or broken Brake shoes are installed backwards Weak brake shoe return spring Wedge and roller assemblies are not engaging plunger slots Brake block is not same mix on each brake assembly DO NOT USE combination brake block Grease or dirt on brake block Shoe hold down clips missing or not properly holding shoes against support pads Lightweight drums allow excessive deflection and bell mouthing 9 Automatic adjusters are not functioning properly 10 A wedge roller is out of the cage BENDIX Weak or broken adjuster lever spring Broken adjuster lever pin Worn or broken adjuster lever or cap teeth Dislodged overload spring Improper lubrication Adjuster bolt and sleeve threads are binding Brake shoes are installed backwards Improper installation of adjuster parts oo See E e ROCKWELL STOPMASTER Detent spring is damaged or broken Adjuster bolt and sleeve threads are binding Brake shoes are installed backwards Improper insta
23. emble the release stud washer and nut on release stud finger tight Figure 24 ANRWND DANGER The below listed instructions step 7 only apply when spring brake is not pressurized If air pressure is used to compress the spring do not tighten release stud nut more than finger tight Torquing the nut can cause pressure plate damage resulting in sudden release of the spring causing death or severe personal injury 7 To cage the compression spring tighten release stud nut with hand wrench DO NOT USE IMPACT WRENCH and make certain the push rod is retracting Figure 24 a DO NOT OVER TORQUE RELEASE STUD ASSEMBLY DANGER Over torquing the nut can cause pressure plate damage S Cam type 35 ft lb 47 Nm Maximum Wedge type 20 ft Ib 27 Nm Maximum b To ensure that the compression spring is fully caged the stud length beyond the nut see X Figure 24 should measure SEALED AND STEEL CHAMBER TYPES ALUMINUM CHAMBER TYPES 30 Chamber 2 7 8 Min 36 Chamber 3 3 8 Min 24 Chamber 2 29 32 Min 16 Chamber 3 1 8 Min 30 Chamber 2 3 4 Min 12 Chamber 2 3 8 Min 24 Chamber 2 13 16 Min WARNING If the recommended X dimension is not correct for chamber size and torque value the spring brake should be considered structurally damaged See 2 under general instructions Tto Release Tool Service Clamp Side Pocket Release Stud 1 4 Turn Clockwise Service A gt Release Tool Push Washer and Retract
24. ent of friction and high water resistance worm screw makes installation Gs and change of linings eas 9 9 Arrow showing the direction of operation Unique assymetrical tooth profile gives high Enclosed rack sintered to a high standard of i a gt s strength density and hardness transferring the move G fi ment of the stroke to the adjusting mechanism ee Strong coil spring guarantees a constant axial pressure of the worm screw Recess in the control disc corresponding to the desired clearance between brake dee s lining and brake drum Gef d he Three O rings protect against dirt water etc Rivets lock screw covers in the desired position Gasket between control unit and housing casio Worm gear of specially treated high grade steel Control arm for fixing the adjuster to the anchor bracket fixpoint Figure 15 OPERATION See Figure 15 Upon brake application the slack adjuster rotates and moves the shoes into contact with the drum The clearance notch corresponds to the normal lining to drum clearance As the brake application continues the rack moves upwards and rotates the one way clutch which overrides in this direction As the brake torque increases the coil spring load is overcome and the wormshaft is displaced axially releasing the cone clutch When the brake begins its return stroke the coil spring load returns to normal and the cone clutch is again engaged The rack is pulled back to its original po
25. er operation of each is listed on the following pages 12 TECH TIPS Automatic Slack Adjusters EUCLID HALDEX Features Benefits amp Advantages Unhanded design Euclid Haldex Automatic Slack Adjusters fit both left or right hand applications except for offsets which are available in 5 8 and 1 2 models Thus greater product coverage results with fewer part numbers Available for 12 4 brakes Euclid Haldex Automatic Slack Adjusters are available for most 12 1 4 brake applications Quicker to install Euclid Haldex uses existing clevis connection Since clevis change is not required retrofit installation time can be cut in half Sealed to prevent contamination Euclid Haldex uses a fixed control arm with a totally sealed body With no external boots contamination failure is eliminated Easy manual adjustment Euclid Haldex Automatic Slacks require no special procedure for de adjustment Euclid Haldex can be manually adjusted and de adjusted at reline or installation the same as manual slack adjusters Unmatched warranty The Euclid Haldex warranty has been extended to 6 years 1 000 000 miles for on highway vehicles Reliable one way clutch converting the linear motionof sw Bushing made of hardened steel the rack to rotary motion j Bearing made of free cutting steel and tenifer treated give a minimum of friction SSC Ze Housing cast in nodular iron and tenifer treated to give The Hexagon on the end of the E alow coeffici
26. er Layer Synthetic Rubber Tube OOS UI III ee U 3rd amp 4th Spirals of 1st amp 2nd Spirals of Synthetic Reinforcement Synthetic Reinforcement Figure 37 This design meets United States Department of Transportation DOT Society of Automotive Engineers and the National Highway Traffic Safety Administration requirements INSPECTION An air leak is usually a sign that a hose needs repair or replacing Hearing an air leak is not the only reason for replacing an air hose Prevention of your vehicle being put out of service on the road is another reason Out of service criteria is in place to prevent problems associated with hose failure on the highway Brake lock up tire flat spotting brake imbalance and accidents are a few of those problems The published out of service criteria includes the following reasons Bulging and or swelling with air applied Improper splice hose forced over pipe and using hose clamps to secure Crimp twist or turn causing restrictions Cut wear damage through rubber cover and outer reinforcement ply ee Some manufacturers will use small vent holes to eliminate air from between the cover layer and the third and fourth spiral reinforcement layers These vent holes will cause no problems in the life of the hose the safety of the vehicle and do not represent an out of service condition See Figure 38 Strands of Reinforcement Cover Layer Improper Crimp 3 amp 4 Spirals of
27. eturn Service Push Rod Spring Compressed Spring Extended LC Parking Push Rod Air Pressure No Air Pressure Diaphragm K LEL Y ft Ly NEL Compression DEAN Spring Parking Return Spring Extended Compression Compressed Spring PARKING BRAKE NOT APPLIED PARKING BRAKE APPLIED Figure 20 Figure 21 The spring extends and applies the brakes when air is exhausted from the emergency brake diaphragm The spring will also extend if air pressure on the trailer drops below 60 psi See Figure 21 16 TECH TIPS Air Brake Chambers MECHANICAL RELEASE OF SPRING BRAKE ALL TYPES DANGER Do not attempt to mechanically release cage the spring when spring brake shows structural damage and or when safety ears have been removed Caging the spring or disassembly of the chamber may result in the forceful release of the spring chamber and its contents which could cause death severe personal injury and or property damage Remove complete spring brake and replace with new unit NOTICE There are no safety ears or clamp on a Sealed Type Brake Remove dust plug from release tool keyhole in center of spring chamber Figure 22 Remove release tool assembly from side pocket of adapter Figure 22 Insert release stud through keyhole in chamber into the pressure plate Figure 23 Turn release stud 4 turn clockwise Figure 23 Pull on release stud to ensure stud crosspin is properly seated in the pressure plate Figure 23 Ass
28. g As we have examined each of the above components of brake shoe repair kits it is clear that each and every part experiences wear through the life of the brake lining Although this wear may seem small at a visual inspection combined it can cause very severe brake wear and performance problems To insure maximum brake life and peak performance all foundation brake hardware components must be replaced at each brake reline For over 50 years Euclid has supplied brake components that are manufactured under the strictest quality controls in the industry MEGA heavy duty brake shoe repair kits include only premium quality components stainless steel bushings diamond knurled rollers and shot peened heavy duty return springs the best in the industry exceeding OEM specifications MEGA PLUS kits include the same high quality components of MEGA kits but add 100 1b shot peened return springs dimpled anchor pin bushings and antiseize lubricant For the price sensitive market segment Euclid offers the STOPMATE standard quality brake shoe repair kit which features zinc clear chromate plated and hardened anchor pins which resist corrosion diamond knurled rollers and standard or heavy duty return springs STOPMATE kits meet OEM specifications while Euclid MEGA and MEGA PLUS kits exceed OEM specifications 4 weindex info weindex info TECH TIPS Foundation Air Brake Hardware Kits EUCLID vs COMPETITION e Euclid brake kits meet or exceed
29. ing Rod cl Nut Push Rod Sealed Type Piggyback Figure 22 Figure 23 Figure 24 17 TECH TIPS Air Brake Chambers COMBINATION SERVICE SPRING BRAKE INSTALLATION INSTRUCTIONS WARNING Before installing a new combination spring brake it is necessary to determine the correct service push rod length to insure proper alignment for efficient operation of the spring brake 1 To determine the correct push rod length of the brake to be installed measure the B dimension as shown See Figure 25 and subtract the setup stroke as listed in Table 1 With the spring brake fully caged B Setup Stroke Push Rod Length Including Clevis WARNING Setup stroke is only to establish push rod length See instruction 7 on page 19 EXAMPLE For a type 30 spring brake if B See Figure 25 5 0 inches setup stroke 1 1 2 inches Table 1 The push rod length from mounting face to centerline of main clevis pin should measure 5 minus in 3 2 in with the spring brake caged See Figure 26 2 To mark the push rod cut off length the length of the threaded rod protruding between the clevis legs must not exceed 3 16 to ensure no interference with the operation of the slack adjuster 3 Once the proper push rod length has been marked the push rod can be cut to length with the spring brake fully caged 4 Install the clevis and jam nut on the push rod and the spring brake to the mounting bracket See Table 2 for installation t
30. ins can cause faster wear on pins bushings and shoes Anchor pin heat treatment and depth of heat treatment also varies between manufacturers Today s non asbestos lining materials are lasting up to 50 longer than in years past causing more wear on anchor pins Euclid supplies only anchor pins that have been hardened to OE specifications ensuring a consistent wear surface 1s maintained through the life of the brake lining A thinner surface may be worn through at an interval between relines causing unstable and inferior braking Plating of anchor pins is the most obvious part to examine for wear when doing a brake reline job Platings are available in black oxide zinc and in many Euclid MEGA Kits hard chrome All these platings provide good corrosion resistance before any brake force is applied to them Hard chrome anchor pins are available in many Euclid kits which have severe service applications and provide the ultimate in wear resistance NOTE Anti seize lubricant should be used in the assembly of anchor pins bushings regardless which plating and material is being used in order to insure smooth rolling action and prevent corrosion ANCHOR PIN BUSHINGS As anchor pins wear so do anchor pin bushings These bushings are included in all complete wheel brake kits where they are used and need to be replaced Proper tools should be used to remove and install these bushings to avoid deforming them during installation Inspect the anchor pin
31. llation of adjuster parts Damaged pawl or adjuster sleeve teeth Adjuster pawl is in backwards or upside down Adjuster pawl springs have collapsed or are missing eee Se a 23 TECH TIPS Air Wedge Brakes AUTOMATIC BRAKE ADJUSTMENT Air Wedge Brakes include automatic adjuster assemblies that maintain the proper brake lining to drum clearance The components of Bendix and Rockwell adjuster assemblies are shown in Figure 32 BENDIX ADJUSTER ASSEMBLY STOPMASTER ADJUSTER ASSEMBLY CR Adjusting Screw ED Seal T D Adjusting Nut Adjusting Sleeve YY Overload Spring Adjusting Nut Cap eae Adjusting Lever Adjusting Cm Pawl Adjusting Plunger Adjusting Lever Spring Spring Cap fa lt Adjusting Lever Pin Figure 32 Although Bendix and Rockwell Stopmaster automatic adjusters differ in design the principle of operation is the same When the brakes are applied the outward movement of the plungers moves the brake shoes against the drum The distance the adjusting plungers move depends on the lining to drum clearance If the lining is worn enough to require adjustment the adjusting plungers will move outward enough for the adjusting lever Bendix or adjusting pawl Rockwell to pick up the next tooth on the adjusting cap Bendix or adjusting sleeve Rockwell When the brakes are released the brake shoe return springs pull the brake shoes away from the drum This presse
32. n in the head of the camshaft this pattern does not wear the camshaft By staying in the same pattern it is proof that the roller is rolling much like gears in mesh and not sliding because sliding wears the camshaft Some rollers are held in place during assembly by wire roller retainers These retainers may be installed incorrectly and cause the best knurled roller not to turn The most commonly mis installed roller retainer is the E 3007A 3 TECH TIPS Foundation Air Brake Hardware Kits Lube here Lube here Do not lube here Lube here ROOD WOOO NOOK OS Q e Q RON C ebe Ee p YY XXX KS O 208 d be SSD d ZE Do not lube here Figure 4 To aid the rollers in turning only the pins must be lubricated See Figure 4 DO NOT APPLY LUBRICATION TO THE ROLLING SURFACE OR HEAD OF CAMSHAPT If lubrication is applied to either of these rolling surfaces the rollers will tend to slide and not roll This sliding action will create flat spots on the face of the roller and cause wear on the camshaft Flat spots on rollers can cause brake adjustment to make very wide lining to drum clearance swings as these flat spots roll around See Figure 5 Even without lubrication smooth Figure 5 rollers are still susceptible to flat spots BRAKE SHOE RETURN SPRINGS Brake shoe return springs serve two important functions 1 to prevent brake shoes from dragging on the brake drum and 2 to maintain tight contact between the brake shoes rollers a
33. nd the camshaft These springs are also a major factor in release timing of foundation air brakes Many uneven wear problems between wheels on a vehicle can be attributed to weak return springs Brake return springs are manufactured for the heavy duty market in different wire types often designated as standard or heavy duty These wire types are not physically identifiable without specialized lab testing Many end users relate wire diameter to the classification of the return spring e small diameter standard large diameter heavy duty Although wire diameter is a factor in spring strength it is not the only factor Color coding between manufacturers is also something that will not indicate the strength of a return spring Because there is no real in field test that can determine the strength of a return spring end users must rely on their quality manufacturers for new springs and replace all return springs at each reline Brake shoe return springs when nicked or marked will most often fail at that mark Care should be taken when installing new return springs not to nick them A screwdriver between the coils must never be used to install springs During manufacturing there is a slight possibility of a mark or imperfection on the spring For this reason Euclid has always exceeded OEM spring specifications by shot peening its MEGA and MEGA PLUS heavy duty return spring to remove any stress that otherwise could cause the spring to fail or brakes to dra
34. ntil brake application torque rises rapidly as brake shoes come into contact with drum Push rod stroke and its characteristic wear points are less of a factor in operating clearance sensing Automatic Slacks GENERAL INSPECTION RECOMMENDATIONS An Automatic Slack Adjuster should never be manually adjusted while in service The only time it should be manually adjusted is during installation or reline If manually adjusted frequently the internal clutch life can be shortened Automatic Slack Adjusters should be lubricated at all routine vehicle chassis lubrications 25 000 miles or three months whichever occurs first Some Automatic Slack Adjusters require the use of special lubricant to maintain watranty Euclid Automatic Slack Adjusters require no special lubricant Check all control arm brackets external links and or external boots for damage These are the most vulnerable areas that can cause improper operation of the adjusting mechanism resulting in Slack Adjuster failure The true test of an Automatic Slack Adjuster is Does it maintain a proper shoe to drum clearance In a new installation the Automatic Slack Adjuster should automatically maintain stroke as listed below If correct on initial installation then during the brake lining life the Automatic Slack Adjuster should maintain this stroke The Automatic Slack Adjuster cannot be operated as a manual adjuster If on a new installation proper stroke cannot be obtained closely inspect th
35. orque The clevis must be adjusted so that it has full thread engagement on the pushrod from flush to 3 16 protrusion d of Slack Adjuster Parallel to mounting surface CORRECT When Brakes are Applied CORRECT Parking or 60 When Brakes psi Service are Applied Parking or 60 psi Service Set up Stroke Push Rod Length Table 1 Including Clevis Figure 25 Figure 26 TABLE 1 STROKE VALUES CHAMBER Sone RECOMMENDED CHAMBER STROKE RANGE SETUP ETHOKE NCHES minum TI MAXIMUM Geier Should be as short a stroke as possible without brake dragging Stroke length measured by applying parking brake or 60 PSIG service brake application Long Stroke Typical setup stroke values NOTICE For special applications consult vehicle brake or slack adjuster manufacturers 18 TECH TIPS Air Brake Chambers COMBINATION SERVICE SPRING BRAKE INSTALLATION INSTRUCTIONS CONT 5 Connect the service and emergency air line to the proper air ports and the clevis to the slack adjuster and uncage the spring brake 6 Adjust the slack adjuster to the listed setup stroke Table 1 With the brake applied the following conditions must occur a push rod 90 to the centerline of slack adjuster b push rod 90 to the mounting face of the spring brake If the setup results in the condition depicted in Figure 27 or Figure 28 the spring brake is misaligned and must be corrected by one or more of the following Figu
36. re 27 a shorten push rod b align spring brake on mounting bracket c mount clevis in proper slack adjuster hole Figure 28 a lengthen push rod b align spring brake on mounting bracket c mount clevis in proper slack adjuster hole If misalignment cannot be corrected consult with foundation brake manufacturer for verification of correct mounting bracket position 7 Once the spring brake and push rod are set Figure 25 release the brakes and follow vehicle manufacturer s instruction for brake adjustment 8 Reassemble release tool inside pocket of adapter and install dust plug in release tool keyhole in center of chamber WARNING After installation check for proper emergency operation service operation and brake adjustment Ce Mounting Surface INCORRECT INCORRECT 3 When Brakes are When Brakes are G 2 Applied Applied Parking or 60 PSI Parking or 60 PSI Service Service More than 90 Less than 90 Figure 27 Figure 28 TABLE 2 INSTALLATION TORQUE VALUES Torque Mounting nut and lock washer 110 150 Ib ft Self locking nut and lock washer 85 95 Ib ft Fine thread mounting nut and lock washer 80 100 Ib ft Jam nut 15 25 Ib ft Ports 10 max Release Stud 25 35 Release Stud in side pocket 5 8 Ib ft 19 TECH TIPS AIR WEDGE BRAKES Product Code 140 141 Air Wedge Brakes provide a good braking system when they are serviced correctly They are more complicated in operation an
37. ring the shoes back and returns the plungers to their original seats in the housings Figure 30 Brake Shoe Assembly Brake Air Chamber Assembly Brake Shoe Assembly Brake Air Chamber Assembly Adjusting Bolt Adjusting att af N Assembly Assembly Adjusting A 5 Adjusting Plunger EAN a e Jda Plunger kA ei e tee d Guide Screw Guide Screw VI77 ty Tee ete d 4 6 d ON or IR Plunger Seal Plunger Seal UE ui d and Retainer and Retainer Assembly Anchor Plunger Solid MANUAL ADJUSTING 1 3 4 STROKE WEDGE ASSEMBLY SHOWN IN ON POSITION MANUAL ADJUSTING 1 3 4 STROKE WEDGE ASSEMBLY SHOWN IN OFF POSITION Figure 29 MAJOR COMPONENTS WEDGE ASSEMBLIES A wedge assembly consists of a wedge two rollers a wedge cage for holding the rollers in place and a wedge return spring Figure 30 Wedges are made with different degree angles that are determined by the brake application The angle degrees are marked on the wedges as shown in Figure 31 An important but often misunderstood point is that the smaller the degree of wedge angle the faster the brake will apply For example wedge brakes with 10 degree angle wedges will apply faster than wedge brakes with 14 degree angle wedges This is critical when balancing brakes and adjusting brake timing Degree Angle Wedge Return Wedge Return Sprin Marked Here Spring Rollers H urn opring Degree Angle Wedge Marked Here
38. rt number E 2739 When using self aligning camshaft support brackets and bushings on trailer axles do not completely torque the support bracket retaining bolts until the camshaft is installed through the bushing After the camshaft is installed and the bolts properly torqued the camshaft must turn freely by hand If not camshaft seals are commonly installed incorrectly This can cause excessive grease build up on the camshaft head and brake shoe rollers The correct installation of camshaft seals and O rings is shown in Figures 10 and 11 SEAL INSTALLATION INTO A CAMSHAFT BRACKET SEAL AND O RING INSTALLATION INTO A BRAKE SPIDER SPIDER BRACKET INBOARD lt gt OUTBOARD Figure 10 Figure 11 9 TECH TIPS Camshaft Repair Kits Place the camshaft head thrust washer onto the camshaft and lubricate the camshaft bushing journals before installing it This makes camshaft installation easier and protects the seals from damage When the camshaft is installed it must turn freely by hand to insure proper brake release Place a spacer washer on the installed camshaft s spline end before putting the slack adjuster on After the camshaft slack adjuster washers and lock ring are in place the camshaft axial movement must be checked with a dial indicator See Figure 12 Eaton specifies axial movement be not less than 005 and not greater than 045 Rockwell specifies axial movement be not greater than 060 Axial movement can be brought
39. s the plungers back into the plunger housings The adjusting nut Bendix or adjusting sleeve Rockwell rotates and threads the adjusting bolt outward adjusting the lining to drum clearance NOTE Rockwell Stopmaster adjusting plungers are made to match the wedge angle The correct adjusting plunger must be used ANCHOR PLUNGERS Anchor plungers take the force of the brake wrap up When installed in a wedge brake assembly the forward drum rotation should always be into the anchor plungers and away from the adjuster assemblies Bendix uses a two piece anchor plunger that can be installed in a right or left hand brake and without regard to the wedge angle Rockwell Stopmaster uses right and left hand one piece anchor plungers that are marked with the wedge angle Right hand anchor plungers are installed in brakes on the right hand side of the vehicle left hand plungers are installed on the left hand side of the vehicle Stopmaster anchor plungers must be matched to the wedge angle See Figure 33 BENDIX TWO PIECE ANCHOR PLUNGER STOPMASTER ONE PIECE ANCHOR PLUNGER Degree Angle Marked Here Ce a 24 Figure 33 TECH TIPS Air Wedge Brakes BRAKE SHOES Both Bendix and Rockwell Stopmaster brake shoes must be installed correctly in the brake assembly Bendix shoe webs are stamped ADJ END on the end that fits into the slot of the adjusting bolt head See Figure 34 Rockwell Stopmaster shoe webs have a long an
40. sition in the notch and any additional travel brought about by lining wear causes the rack to turn the locked one way clutch and rotates the wormshaft through the locked cone clutch The wormshaft then rotates the wormwheel and camshaft adjusting the brakes 13 TECH TIPS Automatic Slack Adjusters CREWSON BRUNNER AUTO SLACK SMART MANUAL SLACK EASY Features Clearance AND load sensing Link rod actuation Adjusts on brake return Easy manual adjustment Extra grease sealing provisions Minimal part numbers for total product coverage Patented Hands Free Installation Guide Outstanding Warranty Figure 16 Operation Figure 17 Benefits amp Advantages Less likely to overadjust than stroke or clearance only sensing No external mounting brackets that can be damaged easier installation Works with air chamber shoe return springs and brake components not against them provides more consistent adjustment This is important on new long life brake designs Does not require component disassembly or cause excessive component wear High integrity seals with built in backup designs Reduces inventory cost complexity Fewer part numbers than automatic slack adjusters with external mounting brackets or stroke sensing adjusting Quickset and most foolproof installation method Figure 16 Four 4 years or 400 000 miles whichever occurs first for on highway trucks tractors and trailers All sealing points design
41. spection procedures must be performed on the camshafts and their related components Camshaft radial movement should be checked with a dial indicator If radial movement exceeds 020 for Eaton brakes or 030 for Rockwell brakes the camshaft must be removed See Figure 8 Inspect the camshafts for wear roughness and or deformed splines See Figure 9 and replace as necessary A knurled pattern on the camshaft S head is an indication that knurled brake shoe rollers were rolling properly on the S head Smooth brake shoe rollers have a tendency to slide on S heads and cause them to wear For this reason Euclid always recommends the use of knurled brake shoe rollers If more than 020 Eaton Brakes or Check for wear cracks 030 Rockwell Brakes replace Geen bushings then recheck Ba and flat spots Check for wear roughness and corrosion Check for cracks 7 wear or deformed splines MOVE Note maximum deflection WW N Figure 8 Figure 9 8 TECH TIPS Camshaft Repair Kits If camshaft bushings have been worn at any point check the brake spider or camshaft support bracket before installing new bushings and seals Wear in the spider or camshaft support bracket affect the fit of the bushings and help create excessive radial movement Camshaft bushings and seals should be installed using the proper installation tools For 1 12 I D bushings and seals use Euclid installation tool E 1250 for 1 5 8 I D use pa
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