Meritor SMT Mechanical Suspension Service Manual
Contents
1. Remove wheels and any air piping and other load sensing attachments on axle Slacken handbrake Remove handbrake linkage from slack adjusters Remove torque arms from axles and hanger brackets Jack up front axle Remove U bolt retaining nuts washers and spring top plate Remove U bolts Lower axle and remove jacks Axle can now be rolled out of the way Remove spring retaining bolt from equaliser Remove road spring Repeat for other side Fig 14 Remove rear axle in the same way B EQUALISER REMOVAL SMT Untighten nut then remove equaliser bolt Fig 15 SMT Service SECTION 5 SMT Equaliser Assembly Equaliser Bracket Equaliser Bush Equaliser Bolt Clamp Washer Nut Assembly of Tandem Suspension A EQUALISER ASSEMBLY Locate equaliser assembly in hanger bracket Smear two tapered bushes with soap solution on outer faces only then insert bushes into either side of the hanger bracket driving them into the equaliser as far as possible with a nylon hammer The equaliser bolt can then be pushed through the bush bores Complete assembly with clamp washer and nut Tighten nut to a torque of 30 36 kgf m 215 260 Ibf ft To ensure correct location of equaliser it is advisable to manufacture a special spacer This will prevent the equaliser being pulled out of centre when the nut is tightened For details of spacer see page 6 B SPRING Fit spring into position making sure that lipped end o2. recommended torque 52 55 5 kgf m 375 400 Ibf ft b Two Three Four Leaf Parabolic recommended torque 52 55 5 kgf m 375 400 Ibf ft c Multi Leaf recommended torque 52 55 5 kgf m 375 400 Ibf ft Note When fitting single leaf two three and four leaf parabolic springs it is imperative that Delrin liners are fitted top and bottom as shown in Fig 13 UNDERSLUNG APPLICATION FIG 13a Range of springs for the SMT standard axle spreads only are as follows a Single Leaf recommended torque 62 65 kgf m 450 475 Ibf ft b Two Three Four Leaf Parabolic recommended torque 62 65 kgf m 450 475 Ibf ft c Multi Leaf recommended torque 62 65 kgf m 450 475 Ibf ft Note When fitting single leaf two three and four leaf parabolic springs it is imperative that Delrin liners are fitted top and bottom as shown in Fig 13a Caution Do not strike an arc on U bolts leaf springs and axles except at designated points when welding in close proximity to these parts they should be protected from weld spatter P an ArvinMeritor brand SECTION 4 Maintenance Overhauling Tandem Suspension i The trailer should be jacked up until the wheels are just clear of the ground and then firmly secured on strong trestles This removes all imposed weight from the suspension and ensures that any work required underneath the trailer is carried out in safety A AXLE ii lt lt
3. an ArvinMeritor brand Meritor SMT Mechanical Suspension Service Manual ArvinMeritor SMT Service INDEX Section Description THE MERITOR WARRANTY FITTING OF HANGER CASTINGS AND EQUALISER BRACKETS Single Axle Tandem Axle Tri axle Widespread Tandem Axle Sub Frame Check Gussets Pipe Brace Capacity Plate ASSEMBLY TO FRAME Fitting Spring Seats and Springs to Axle Fitting Axle to Trailer Frame Fitting Spring Retaining Bolts Equaliser Assemblies Fitting of Torque Arms Alignment and Adjustment SPRINGS Overslung Applications Underslung Applications OVERHAULING TANDEM SUSPENSION Axle Equaliser Removal ASSEMBLY OF TANDEM SUSPENSION Spring Torque Arm Axle TAPER LEAF SPRING SUSPENSION TRAILER SLOPE TRI AXLE PERFORMANCE AXLE CAPACITY RATINGS ty an ArvinMeritor brand Page 10 11 11 SMT Service Meritor Limited Warranty 1 AXLES MECHANICAL AND FLEXAIR SUSPENSIONS INDAIR OTHER MERITOR ACCESSORY PRODUCTS 24 MONTHS PARTS AND LABOUR Effective 1st March 1989 2 AXLES AND FLEXAIR UNITS ASSEMBLED BY MERITOR 36 MONTHS PARTS AND LABOUR Effective 1st May 1992 The Company warrants that at its option it will repair or replace without charge any original Meritor axle suspension trailer component and any axle and suspension assembly which is found on examination by the Company to be defective as to material or workmanship Subject to such assembly or component having been us
4. and position U bolts on axle beam ensuring they are as close as possible to the Spring Seat x FRONT DO NOT FIT BOLT THROUGH THIS HOLE D EQUALISER ASSEMBLIES SMT Equaliser assemblies when supplied are handed for ease of maintenance However it should be noted by the trailer builder that the equaliser assembly can be installed two different ways one with the head of the equaliser bolt facing outwards this is the way that Meritor would prefer it to be installed because the equaliser bolt can easily be removed in the event of the bushes being replaced Alternatively if the trailer builder s preference is for the equaliser bolt nut to be on the outside then sufficient clearance must be allowed under the trailer for the removal of the equaliser bolt so that again the bushes can be replaced when required E FITTING OF TORQUE ARMS SMT SERIES Adjustable torque arms fitted kerb side Install torque arms between hanger bracket lugs dip torque arm bushings into a solution of 50 water and 50 liquid soap Then insert from each side into hanger bracket and torque arm bores Tap bushings into position with hide hammer to ensure no damage is done to bushes Fit torque arm bolt clamp washer and nut To ensure correct location of torque arm and to avoid metal to metal contact at the four points marked A it may be necessary to fit special spacers as shown in Fig 9 This will prevent the torque arm being pulled o
5. the spacer block dowel hole The liner E without a hole is then placed between the top of the spring and the spring top plate F Fit U bolts G and secure with washers and nuts Line up the springs so that they are at right angles to the axle centre line Tighten U bolt nuts to 52 kgf m 375 Ibf ft Conversion kits are available as shown in table above Spring Seat Thickness Dimension Replacement Kit No The taper leaf kit will give the same unladen frame height as the multi leaf spring it replaces The fully laden frame height will be about 25mm 1 higher when taper leaf springs are fitted SECTION 7 Trailer Slope Relative to Spring Seat Heights When considering the axle and suspension to be specified for a new trailer always take into account the angle of slope as shown in Fig 20 If this angle is greater than that specified against each type of suspension shown below in the laden condition the equaliser will have excessive tilt see Fig 21 This tilt will reduce the equaliser movement causing the equaliser to strike the frame under uneven road conditions a p af r a an ArvinMeritor brand This can be overcome by specifying spring seats 25mm 1 higher on the forward axle than the seats at the rear see Fig 22 or alternatively by welding packing pieces 25mm thick to the existing spring seats see Figs 23 and 24 Shown in Fig 23 is the same malfunction on a widespread su
6. 13 Meritor HVS Barcelona S A Commercial Vehicle Systems Ctra Granollers Sabadell Km 13 3 Poligono Argelagues 08185 Lli de Vall Spain Telephone 34 9 3 843 95 68 Fax 34 9 3 843 83 59 For further information contact Meritor HVS Limited Commercial Vehicle Systems Rackery Lane Llay Wrexham LL12 OPB U K Telephone 44 0 1978 852141 Fax 44 0 1978 856173 www arvinmeritor com Copyright 2001 Meritor Automotive All rights Reserved Publication 4 01 4 ArvinMeritor Inc World Headquarters 2135 West Maple Road Troy Michigan 48084 U S A Telephone 1 248 435 1000 ArvinMeritor Commercial Vehicle Aftermarket AG Neugutstrasse 89 8600 D bendorf Switzerland Telephone 41 0 1 824 8200 Fax 41 0 1 824 8264 ArvinMeritor Commercial Vehicle Systems Postbus 255 5700AG Helmond Churchilllaan 204A 5705BK Helmond Holland Telephone 31 0 492 535805 Fax 31 0 492 547175 ArvinMeritor South Africa Commercial Vehicle Systems Telephone 27 0 83 602 1603 Descriptions and specifications were in effect at the time of publication and are subject to change without notice or liability Meritor reserve the right to make design improvements change or discontinue parts at any time ArvinMeritor
7. 52 55 kof m to either of the rear hanger brackets corresponds with the correct capacity of the running gear to facilitate future plating of the vehicle B FITTING AXLE TO TRAILER FRAME Position axle and spring assembly under trailer frame inserting the springs first into front hanger bracket and then into equaliser bracket C FITTING SPRING RETAINING BOLTS Fit spring retaining bolts A and nuts in position in equaliser bracket Fig 7 and tighten Lower axle Repeat for rear axle SECTION 2 New Suspension Assembly to Frame Tandem Note One important aspect of assembly which should always be closely watched is the allowance of sufficient clearance in the positioning of air cylinder brackets etc for the withdrawal of torque arm bolts and the Note equaliser bolt Compliance with this can save time money and temper When assembling the springs on the widespread suspension it is most important that the spring retaining bolt marked X should be fitted to the FRONT equaliser only Fig 8 Under no circumstances should a A FITTING OF SPRING SEATS AND SPRINGS TO bolt be fitted to the REAR equaliser Failure to observe this instruction AXLE will result in restricted equaliser movement and possible damage to the i Weld spring seats into position on axle to pre suspension unit determined centres For spring centres see page 11 and Axle section for Beam Welding procedure ii Lift springs on to spring seats
8. ed solely on a vehicle for which the specification and applications have been approved by the Company s engineering department and in accordance with the approved applications and the vehicle not having been altered from the manufacturer s specification This warranty and the obligation to repair or exchange are complete and exclusive No liability is accepted for special or consequential expenses damages of any nature The warranty does not apply to normal wear and tear abuse damage caused by accident failure to lubricate as specified in accordance with manufacturer s instructions and if adequate storage facilities and protection are not provided the damage resulting from deterioration up to the time Meritor products are delivered to the first owner user Allowances for labour will be paid for repair or replacement only as determined and APPROVED by Meritor Service Department BEFORE SUCH LABOUR HAS STARTED All claims submitted under this warranty period must be filed in writing with the Meritor Aftermarket Services Division within 60 days from the date of failure and all components involved in the claim must be retained and available for inspection for 90 days from the date of claim being submitted No deductions shall be made from remittances or current accounts in respect of any warranty claims whilst those claims are being processed All claims must quote component Serial Numbers where applicable and relevant vehicle numbe
9. f spring is inside equaliser Fig 17 Insert spring retaining bolts into equaliser Fit washers and nuts to spring retaining bolts A and tighten If a new spring is to be fitted make sure that preserving grease is only removed from area covered by top plate and spring seat See notes regarding fitting of taper leaf spring page 9 an ArvinMeritor brand SMT Service C TORQUE ARM Follow procedure outlined under fitting of torque arms on page 6 i ii ii iv Fit adjustable torque arms to front hanger brackets on kerb side of vehicle Be sure that the slots of the clamp point downwards except on special underslung application Insert bolt through torque arm bushes and fit flat washer Fit nut onto bolt but do not fully tighten Tighten clamp bolts but not to full compression Repeat operation 5 c and 5 d for rear axle fitting adjustable torque arm to equaliser bracket Repeat operation 5 c 5 d and 5 d i for fixed torque arm to road side D AXLE Vv vi Roll axle into position and raise until spring seat makes contact with underside of spring Place top pad in position Insert U bolts on spring seat and top plate Fit washers and nuts Line up springs so they are at right angles to axle centre line Follow procedure outlined under fitting of torque arms on page 6 and tighten nut to 30 36 kgf m 215 260 Ibf ft vii viii ix Repeat opera
10. ff centre and prevent excessive build up of rubber under head of bolt as shown in Fig 10 When thickness of rubber under head of bolt approximately 2mm remove spacer from under clamp washer and tighten nut to 30 35 kgf m 215 260 Ibf ft Remove spacer between torque arm and inside wall of hanger bracket F ALIGNMENT AND ADJUSTMENT Commence alignment by measuring from the centre of the fifth wheel king pin to the outside centre of the front axle Adjust by turning torque arm screw until the dimensions X X are within 1 5mm of each other Tighten clamp bolts to recommended torque Alignment of the rear axle is then carried out using the same procedure as with the front axle until the dimensions Y Y are within 3mm of each other Fig 11 Tighten clamp bolts an ArvinMeritor brand SPACERS IN POSITION POINTS A KING PIN Note Torque arms with 12mm dia bolts should be tightened to 10 kgf m 70 lbf ft Fig 12 After a period of running in check all nuts for correct torque then again after 1 000 km and subsequently at every 10 000 km intervals Check all nuts for correct torque The equaliser bolt should be checked for torque at 30 36 kgf m 215 260 Ibf ft 12mm DIA BOLTS SMT Service SECTION 3 Springs OVERSLUNG APPLICATION FIT DELRIN amp BOTTOM SPACER WELDED TO SEAT Range of springs for the SMT standard axle spreads only are as follows a Single Leaf
11. kets can then be positioned from the equaliser bracket and the sub frame set in position on the trailer by taking a measurement from the king pin to the centre of the equaliser brackets Fig 5 F CHECK All castings should firstly be tack welded in place A careful check should then be made to ensure that the hangers and brackets are correctly located and are square with the frame Final welding can then be carried out Welding to be carried out with low hydrogen electrode with a minimum of 8mm fillet weld around all sides of the bracket G GUSSETS It is recommended that gussets are fitted in all instances where brackets are welded to underside of frame Fig 6 H PIPE BRACE After all hangers and equalisers have been installed cut pipe braces to fit between right and left front hangers equaliser brackets and rear hangers on widespread and tri axle suspension For positioning of braces see Fig 6 cut length to suit recommended size 60mm 0 D x 4 00mm wall minimum KING PIN TO CENTRE OF EQUALISER BRACKET KING PIN TO CENTRE OF EQUALISER gt bs i J a an ArvinMeritor brand I CAPACITY PLATE iii When U bolts are in position place top plate in a ee pee position on springs and fit washers and nuts onto U Trailer manufacturers should ensure that the identification plate riveted bolts Recommended torque
12. lity Assurance SECTION 1 New Suspension Fitting of Hanger Castings and Equaliser Brackets Note It is normal procedure to commence the building of new suspensions in an inverted position A SINGLE AXLE Position the front hanger bracket by measuring from the king pin to the centre of the casting The rear hanger position can then be located from the front hanger after reference to the assembly drawing Fig 1 B TANDEM AXLE The equaliser is supplied as a complete unit and should be positioned first by taking a measurement from the king pin to the centre of the equaliser bracket The front and rear hanger castings can then be positioned by measuring from the centre pin of the equaliser bracket to the centre of the appropriate hanger bracket again after reference to the assembly drawing Fig 2 C TRI AXLE Installation again as above after reference to assembly drawing to ascertain axle centres Fig 3 KING PIN TO CENTRE OF HANGER BRACKET an ArvinMeritor brand D WIDESPREAD TANDEM AXLE Here again the position of the suspension is determined by a measurement taken from the king pin to the centre of the suspension From this mark the position of the equaliser hanger brackets can be located as previously Fig 4 E SUB FRAME When installing a suspension to a sub frame check the sub frame for squareness before the equaliser bracket position is found The front and rear hanger brac
13. nsidering each installation individually after judging fifth wheel height wheel base etc When a steering axle is required Meritor Engineering Department should be consulted The laden ride height of fifth wheel must also be taken into consideration when determining trailer slope If a variation greater than plus or minus 15mm is expected from the specified slope a tri axle suspension will not properly compensate The preceding criteria are not applicable to multi axle air suspension configurations For details of mount heights weights etc please send for Meritor s air suspension literature and specification an ArvinMeritor brand SECTION 9 Certified Axle Capacity Ratings sm wnat Nominal Axle Rating Spring Centres Ratings shown are for normal highway applications and may vary with special applications and service All special applications must be approved by Meritor Design Engineering Department Meritor HVS Limited Commercial Vehicle Systems Rackery Lane Llay Wrexham LL12 OPB U K Telephone 44 0 1978 852141 Fax 44 0 1978 856173 Meritor HVS Mitry Mory S A Commercial Vehicle Systems Z du Moulin a Vent 9 rue des Freres Lumiere 77290 Mitry Mory France Telephone 33 0 1 64 27 44 61 Fax 33 0 1 64 27 30 45 Meritor HVS Verona s r l Commercial Vehicle Systems Via Monte Fiorino 23 37057 San Giovanni Lupatoto Verona Italy Telephone 39 045 8750399 Fax 39 045 8750640 87505
14. r identification and also assembly Serial Number and manufacturing date code where applicable This warranty is in substitution for and excludes all express or implied statutory or other conditions warranties guarantees or liabilities whether as to fitness for a particular purpose quality standard of workmanship or otherwise Save as provided herein the Company accepts no liability whatsoever for defects in parts or for any injury loss or damage attributable thereto howsoever arising whether direct indirect or consequential F an ArvinMeritor brand Warranty Procedure Should any Meritor equipment fitted to your trailer become unserviceable within the warranty period contact the trailer manufacturer or Meritor Service Department who will advise on the appropriate action A comprehensive network of original parts distributors and service stations operate throughout Europe this is supported internationally with agents strategically placed around the world Meritor HVS Limited reserve the right to make changes in specifications shown herein or add improvements at any time without notice or obligation PARTS SHOWN ARE MADE FROM DRAWINGS IN WHICH COPYRIGHT SUBSISTS THE MAKING OF COPIES OF ANY OF THESE PARTS IS PROHIBITED Meritor HVS Limited Erkend door de Raad voor de Certificatie The high quality assurance management systems applied by Meritor are endorsed with the awarding of ISO 9001 Lloyd s Register Qua
15. spension A packer of appropriate thickness welded in position will correct this as shown in Fig 24 Alternatively the addition of a suitable tapered spacer welded between the hanger bracket and the main frame will achieve the same result Tandem Suspension One in one hundred 1 100 Widespread Suspension One in one hundred and fifty 1 150 Tri Axle One in two hundred 1 200 If the angle of slope is greatly in excess of the above slopes a packer of greater depth than the 25mm will be required to combat the equaliser tilt ANGLE OF SLOPE CORRECTED ALTERNATIVE PACKING PIECE 1 HIGH WELDED TO SPRING SEAT SMT Service SECTION 8 Tri Axle Performance Investigations into the performance of trailers fitted with tri axle suspensions have shown that installation is more critical than for tandem suspensions The platform slope in the laden condition if above the recommended maximum quoted has apart from reducing equaliser travel a critical effect on axle loadings High axle loadings can cause excessive tyre wear or even failure particularly when cornering Therefore it is imperative when installing a tri axle suspension that particular attention should be paid to the laden trailer s slope If the slope is greater than one in two hundred the packing pieces must be welded to the spring seats on the front and centre axles the deepest being fitted to the front axle The depth of packing can only be determined by co
16. tions iv v and vi for rear axle Refit handbrake linkage to brake adjusting lever using new split pins Air Chamber Fit air chambers to brackets inserting the two holding bolts through holes in the bracket fitting washers and then screwing nuts home Fit air chamber connecting rod to brake linkage and secure by inserting split pin through retaining shaft Finally tighten nuts holding air chamber to bracket Carry out alignment and adjustment procedure as described in operation f alignment and adjustment of installation for new suspensions on page 6 Tighten torque arm clamp bolts to 10 kgf m 70 Ibf ft Fig 18 Fit road wheel and remove jacks from under axle 10 kgf m 70 Ibf ft an ArvinMeritor brand SECTION 6 Fitting Conversion of Monoleaf Spring Suspension Installation is similar to the standard multi leaf suspension and the instructions given for the latter should be closely followed However due to the reduced depth of the spring certain additional parts are required in order to maintain the necessary mounting height Spacer block A Fig 19 is placed on top of the spring seat B and securely welded using the recessed area at either end of the block care being taken to ensure the top faces are square to the spring seat faces The Delrin liner C with hole is then placed on the top face of the spacer block and the location dowel on the underside of spring D located in
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