R-Series Manual
Contents
1. lt l eT T Red Efdyn de Ree Toll Free SAR a 7734 East 11 Street Phone 918 838 Tulsa Oklahoma 74112 www efdyn com sales efdyn com EAN MOTION MANAGEMENT IV OIL FILLING A B C With shock absorber in a horizontal fill port up position remove filler port plug Remove bleeder screw Pour oil into filler port until a steady flow of oil without air bubbles emerges from the bleed screw hole Let shock absorber oil level bleed down to the bleed screw hole Replace filler port plug and bleeder screw E Force piston rod in slowly several times Remove port plug and bleed screw recheck oil level adding more if required DO NOT OVERFILL This can cause distortion of the outer jacket tube during operation V OPERATION A Uniform Deceleration This principle governing the operation of EFDYN shock absorbers provides the gentlest possible cushioning throughout the complete stopping range The precision non adjustable orifices specifically engineered and designed for conditions of each load range to ensure optimum performance 1 Velocity If the load to be stopped has no propelling force such as gravity air cylinder hydraulic or electric drive then the stopping force results from inertia only velocity at impact does not affect uniform deceleration Under these conditions hydraulic pressure in the shock absorber will be proportional to impact velocity which is limited to the maximum capacity rating of t2. of the moving load E Air Charged Shock Absorbers Air charged shock absorbers are shipped filled with oil to proper level and without air charge piston rod in compressed position Prior to usage unit must be charged to air pressure specified ll INSTALLATION A General R Series standard self contained spring return shock absorbers may be mounted horizontally or vertically with piston rod up If a unit has been specified to operate at an angle of more than five degrees either side of horizontal or vertical centerline bleeder screws will have not been relocated accordingly before shipment However if an accumulator is used a standard shock absorber may be mounted at any angle B Mounting Support 1 The supporting structure must be rigid and so constructed that deflection under full stopping force is negligible Efdyn Incorporated fd Toll Free 800 950 1172 7734 East 11 Street WWW n m Phone 918 838 1170 Tulsa Oklahoma 74112 y CO sales efdyn com EAN MOTION MANAGEMENT 2 The moving load must be well guided and in line with the shock absorber at point of impact If it is subject to lateral wandering side forces may be imposed on the piston rod resulting in excessive bearing wear If the contacting surface on the load is soft in comparison to the cap a depression may be formed which could trap the bumper cap and result in a bent rod if the load shifts To avoid this attach a hardened plate at the point of impa
3. or no c Worn or broken piston ring causing excessive oil bypass to rod end of piston Load conditions not matched to shock absorber orificing Load jars heavily at beginning of stroke but finishes stroke gently Shock absorber is over filled with fluid and there is no room for piston rod displacement This is apt to rupture outer jacket tube or blow seals Load jars heavily at a beginning of stroke and does not complete full stroke b Load conditions not matched to shock absorber orificing Efdyn Incorporated 7734 East 11 Street Tulsa Oklahoma 74112 www efdyn com If a piston rod is bent or the surface is significantly damaged it is usually best to order a new piston rod assembly rather than try to straighten or smooth the damaged part Such repairs are difficult to perform effectively enough to prevent further rod seal damage Remove piston rod assembly and examine piston ring for breakage especially at thin joint sections If piston ring is broken or shows evidence of excessive ware or scoring examine hydraulic fluid for contamination If cylinder walls are not scored replace piston ring purge unit clean and refill with clean fluid a Oil level low Refill properly See Section IV resistance during the stroke b Load conditions not matched Consult factory and hammers heavily at end to shock absorber orificing of stroke Remove piston rod assembly and examine piston ring I
4. EFDYN MOTION MANAGEMENT R SERIES SHOCK ABSORBER INSTALLATION OPERATION AND SERVICE MANUAL sales efdyn com www efdyn com 7734 E 11 ST 800 950 1172 TULSA OK 74112 FAX 918 835 3334 EAN l General Instructions The EFDYN R Series Model shock absorbers are reliable units designed to cushion a moving load to the most gentle stop possible They are ruggedly built and will perform for many years of trouble free service provided adequate maintenance procedures are followed A Surface Finish All standard shock absorbers are painted EFDYN Blue per EFDYN Spec 1 3238 02 01 Shocks used in outdoor environments are painted with Anchor Paint black epoxy 3900 THE PISTON ROD SHOULD NEVER BE PAINTED B Serial Number Every unit manufactured by EFDYN is assigned a serial number It is stamped on the unit This number should always be given when ordering a unit for an identical application or spare parts C Fluid Filling All self contained spring return air charge return and mechanical return shock absorbers are shipped filled with oil unless special conditions dictate otherwise Air return shock absorbers are shipped dry See Filling Instructions Section IV D Spring Return Spring return models incorporate internal or external springs which return the piston rod to the outward position with sufficient force to overcome friction Do not rely on the spring force to return outside members which might be part
5. ated fd Toll Free 800 950 1172 7734 East 11 Street WWW n m Phone 918 838 1170 Tulsa Oklahoma 74112 y CO sales efdyn com EAN MOTION MANAGEMENT B Parts Replacement 1 A new set of packing and seals may be ordered and installed if oil loss becomes excessive after long service These packing and seal kits consist of the following parts Item No Description No Required 10 Rod Wiper Standard 1 15 Gland Seal 1 26 Bleeder Screw 2 56 Rod Seal Standard 1 2 Replacement can be made as follows a Remove bumper retaining screw and the bumper cap taking care not to score the piston rod b Place unit in a vertical position with piston rod upward and remove snap ring at the front head CAUTION Piston rod assembly is spring loaded It is recommended that the unit be placed under a press prior to removing the snap ring c With piston rod restrained against return spring force the gland may be removed by compressing the rod and allowing the piston rod assembly to bump out the gland on return d Slowly relieve rod restraint and remove piston rod and gland assembly e Remove gland and retainer assembly from piston rod f Remove rod seal from gland notice that rod seal lip ends face inward into gland Remove rod wiper from retainer and gland seal from gland g Install new rod seal rod wiper and gland seal 3 The gland Assembly item no 118 should be checked at the time of disassembly If there is evidence of e
6. ce springs and spring spacers 8 Tore assemble shock absorber a Place unit under arbor press Insert piston ring starting sleeve item 86 in open bore of front head Since return spring will extend beyond the head starting sleeve must be passed over spring Place pre assembled piston and rod assembly on spring and press in slowly until piston has entered the cylinder bore about 3 1 2 inches beyond the starting sleeve d Hold assembly in place and remove starting sleeve e Press gland and rod seal assembly into head bore and insert rod wiper Efdyn Incorporated 7734 East 11 Street Tulsa Oklahoma 74112 retainer ring item 16 Release press and replenish oil as required Compress and retract piston rod several times to ensure ease of piston rod return and proper assembly The gland well around the retaining ring and piston rod should be inspected for leakage or excessive rod wipage heavy film on rod to ensure packing tightness Unit should be ready for operation Toll Free 800 950 1172 www efdyn com Phone 918 838 1170 sales efdyn com EAN MOTION MANAGEMENT TROUBLE SHOOTING A Piston rod fails to return out 2 ward when load is removed continued B 1 2 3 Dents or gouges on surface of piston rod caused by hard objects striking it 3 Bent piston rod 4 Broken piston ring Foreign matter wedged between piston and cylinder wall Improper Cushioning Load meets little
7. ct on the moving load C Protecting Piston Rod Trouble free performance depends largely on smooth functioning of the piston rod Utmost care should be taken during installation and operation to prevent bending denting scratching or gouging D Special Safety Measures 1 Mounting screws should be of high strength alloy steel 2 External mechanical stops are recommended for the load set to contact just before the bumper cap on the piston rod strikes the shock absorber front head This added protection is desirable in order to prevent the bumper cap from impinging against the front head 3 Back up bar keyed or welded to base must be provided at rear of lug mounted models to prevent shear loading on mounting bolts 4 Run the load into the bumper at slow speed after the shock absorber has been mounted and filled to test for proper operation lil HYDRAULIC FLUIDS Dexron IIl Mercon Hydraulic Fluid Typical specifications are Gravity API aaien ds ns Stabee 31 0 Viscosity Saybolt Universal Seconds at 100 degrees E sa pg xc TGT DR a Z TRS OE vr 175 at210 degrees Ps cute css 51 Viscosity CP Brookfield CRC L 45 At 40 degrees F 17 500 Viscosity Index ASTM D 2270 183 Flash COC Degrees Ps cuisses ire 367 Pour Point Degrees F not less than 60 Corrosion ASTM D 665 Pass E
8. f ware or damage is evident replace ring Consult factory Bleed off excess oil to proper fill point See Section IV Consult factory Toll Free 800 950 1178 Phone 918 838 1170 sales efdyn com EAN MOTION MANAGEMENT DIFFICULTY POSSIBLE CAUSE REMEDY 4 Load cushions softly but jars ja Improper load conditions Consult Factory at end of stroke and then l bounces back b Excessive aeration of the Refill properly See Section fluid soft springy action IV Install external 1 Low oil level accumulator 2 With spring returned self contained units duty cycle may be too high Mounting structure too Stiffen unit mounting flexible for transmitted structure or use shock stopping forces absorber with longer stroke In cases of emergency operate at reduced velocity C Excessive ware or scoring of Hydraulic fluid is Purge and refill with clean piston rod and or rod contaminated with abrasive fluid bearing particles Efdyn Incorporated fd Toll Free 800 950 1172 7734 East 11 Street Phone 918 838 1170 Tulsa Oklahoma 74112 www e yn com sales efdyn com EAN MOTION MANAGEMENT 10 R Series Part List ITEM NO DESCRIPTION a Jacket Tube 2 2 OOOO Flange 2 Piston Bearing d Pressure Tube B 2 OO Piston Ring Retainer B Piston Too ongs Piston Rod B Bumper Cap 10 o o Rod Wiper 3 i Fill Port Plug 12 Piston Ring 123 Z oO oOo Return Spring 15 O Ring Gland 16 Retaining Ring G
9. he shock absorber 2 Propelling Force If any significant propelling force is present any change in moving load weight velocity or propelling force will adversely affect the stopping characteristics of the shock absorber For all practical purposes a load variation of 15 above or below the design load will not seriously alter the uniform deceleration characteristics of the shock absorber Operating Temperature 1 Range with Dexron IIIl Mercon Hydraulic Fluid 40 to 190 F 2 Temperature Rise Hydraulic shock absorbers convert all the kinetic energy of the moving load into heat during operation This heat build up causes a temperature rise within the shock absorber which is proportional to the energy absorbed cycle rate bore and stroke of the shock and ambient temperature Radiation from the sun or other hot bodies and contact area of mounting members are factors to be considered Efdyn Incorporated Toll Free 800 950 1172 7734 East 11 Street WWW efdyn com Phone 918 838 1170 Tulsa Oklahoma 74112 sales efdyn com EFDYN MOTION MANAGEMENT C Other factors Influencing Successful Operation 1 Polyurethane rod packings are standard on all EFDYN shock absorbers Petroleum base and silicone fluids are compatible with these compounds The shock absorber should be flushed with a suitable flushing agent when changing from one type of oil to another 2 A polyurethane wiper scraper is provided on the piston rod to effect
10. ively exclude contaminants from vital working parts 3 Hydraulic fluid used must be clean free from contaminants and filtered to a cleanliness level of 100 microns absolute 4 Do not use fire resistant fluids unless packing compatibility has been determined Special piston rod packing is required for phosphate ester fluids VI MAINTENANCE EFDYN shock absorbers will provide many years of trouble free service provided they are properly maintained To ensure optimum performance they should be inspected periodically for wear and proper fluid operating level Heavy duty applications require more frequent maintenance Replacement of working parts should be made to prevent irreparable damage The following service inspection schedule is recommended Class of Service Inspection Schedule Heavy Duty Foundries Steel Mills High 60 days cycle applications outdoor service Moderate Duty Automotive plants Packaging 120 days Plants Low cycle applications Indoor service A Oil Replacement A small amount of oil wipage is normal at the piston rod gland In fact ifa controlled amount of lubrication were not present the seals would run dry and wear out prematurely After long service the piston rod seals will wear to the extent that oil replacement will become necessary more frequently Replacement oil must be filtered to at least 100 microns absolute and be the same type as is in the unit See Section IV Efdyn Incorpor
11. land 21 Cap Screw Bumper 26 Bleed Screw 28 Gland 33 o oooO Rod Bearing 46 Front Head Bp Rod Seal 59 Wiper Retainer 138 Fill Port Bushing Efdyn Incorporated Toll Free 800 950 1172 7734 East 11 Street www efdyn com Phone 918 838 1170 Tulsa Oklahoma 74112 sales efdyn com EFDYN MOTION MANAGEMENT g N ZA TN N eS Yd A LA ET LT LT NT LT LLL N N CLL LL LZ XL CVS AVS LT LN LLL IL LLL LL SIII PAIA PELASI NN Shh DI N WS H E j j ARS NEm E NEANS i L K L ial 15 S LU U K C IRNSS liz S J 7 THIS DRAWING IS THE PROPERTY OF PA SE PERSE CES 1608 000 _ Marea 6 4608 0 00 VS ae Gene MATERIAL DISCLOSED I ISISSUEO N RV CS Lo K S CO ED peed Pt Ld PE FINISHES UNLESS Efdyn Incorporated fd Toll Free 800 950 1172 7734 East 11 Street Phone 918 838 1170 Tulsa Oklahoma 74112 www e yn com sales efdyn com
12. xcessive ware or scoring of gland bearing the Gland Assembly and Wiper Retainer item no 59 should be replaced 4 Inspect the piston ring and the piston bearing for wear or scoring If these signs are present the parts should be replaced 5 To replace Rod Seal Assembly item no 88 a Remove bumper cap b Hold piston and rod assembly vertically in bench vise by clamping on piston nut c Place torpedo EFDYN assembly tool item 148 against matching holes d Pre assemble Gland Assembly item 188 Rod Seal item 56 Wiper Retainer item 59 Rod Wiper item 10 and Wiper Retainer Snap Ring item 16 as a group and slide over torpedo onto piston rod e Replace bumper cap and secure cap screw with a medium strength thread locking fluid Torque cap screw item 21 to 1000 in Ibs Efdyn Incorporated fd Toll Free 800 950 1172 7734 East 11 Street WWW n m Phone 918 838 1170 Tulsa Oklahoma 74112 y CO sales efdyn com EAN MOTION MANAGEMENT 6 Replace Gland Seal item 15 in groove of gland assembly 7 Before re assembling unit inspect the cylinder bore for wear marks or scoring Bore was originally honed to a 10 15 micro finish If the bore is scored shock absorber performance could be adversely affected by oil leakage past the piston ring Proceed as follows a b C d Remove springs and spring spacers Remove hydraulic oil from unit Inspect bore re hone if necessary Repla
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