Eaton TE series Installation & Service Manual

Contents

Eaton TE series Installation & Service Manual Manual pdf 7 page image

5ServiceThe following instructions describe thecomplete rebuilding of your Vickers TE,TF or TL cylinder.Refer to Figure 4 exploded view.WarningBefore breaking a circuit connection,make certain that power is off andsystem pressure has been released.Lower all vertical cylinders, dischargeaccumulators, and block any loadwhose movement could generatepressure. Plug all removed units andcap all lines to prevent the entry of dirtinto the system.Required ToolsSpanner wrenchAdjustable wrenchSoft brass toolThin tool (like a metal ruler)Copper padded viceRubber malletTorque wrenchReplacing Rod Seals1. Once the cylinder is removed fromservice, fully retract the piston rodand remove all port connections.Drain any hydraulic fluid by manuallycycling the cylinder. Large cylinderscan be carefully cycled with airpressure.2. The Quick Change rod cartridgeallows rod seal replacement withoutdisturbing the tie rods. Remove anyburrs from the wrench flat area of thepiston rod. Place the cylinder in a vice,rod end up if possible. Remove therod bearing retainer plate by removingthe retainer screws. The retainer maybe round, square or rectangular.Round retainers that are recessed intothe head have a pry groove on theO.D. or two tapped holes to aidremoval.3. Remove the rod seals on smallercylinders by placing your thumb overthe rod end port and giving a quickpull on the piston rod. Use lowpressure air in the rod end port forlarger cylinders. Leave the bearingon the rod to catch the seals as theyleave the seal cavity. Note theposition of the male seal adaptorrelative to the bearing and the seals.Leave the male seal adapter in placeif in the bottom of the seal cavity, tosupport the piston rod whileperforming the remainingdisassembly.4. Remove the elastomer rod wiper orrod scraper retainer from the rodbearing. Remove the rod scrapers ifapplicable.5. For metallic scrapers, stack the newscraper rings so that the slots arestaggered. Lightly lubricate the newwiper or retainer and push it into thebearing groove with a soft brass tool.6. Lightly lubricate the new rod sealsand replace, one at a time, byleading the outside sealing edge witha soft brass tool as each seal isinserted in the cavity. Be careful notto damage the seals when placingthem over the piston rod.7. Carefully replace the bearing on therod. Slide the retainer plate intoposition. Replace the retainerscrews, and tighten in a crosssequence pattern. Torque to valuesshown in Table 2 below.Retainer Screw TorqueRetainerScrewSizeScrewPart #6893ScrewPart #6894Rec.Torque(ft-lbs)1 /4 - 28 -1 -2 -1 -2 -3 71 /4 - 28 -1, -2 -1, -2, -3 75 /16 - 24 -3 -4 -4 -5 125 /16 - 24 -3, -4 -4, -5 123 /8 - 24 -5 -6 -7 223 /8 - 24 -5 -6, -7 221 /2 - 20 -6, -7 -8, -9 50Table 2.Complete Rebuild1. Repeat steps 1, 2, 3, 4 and 5 inReplacing rod seals section.2. Remove the tie rod nuts, looseningin a cross sequence pattern.Carefully remove the cap or headfrom the tie rods and inspect fordamage or signs of contamination.3. Remove the cylinder body from thehead/cap. Slide the piston rodassembly out of the cylinder body. Itis not necessary to remove the tierods if threaded into a tapped heador cap for servicing, unless thetapped head or cap is mechanicallydamaged.4. The piston does not have to beremoved from the rod for normalpiston seal replacement. Cast ironpiston rings may be removed byinserting a thin tool under the jointand running it around thecircumference of the piston.5. Remove the nonmetallic wear bandwhich simply snaps into the grooveon the piston’s outer diameter, ifapplicable.6. If piston removal from the rod isrequired, slide the piston rodassembly out of the cylinder body.Clamp the rod securely in a copperpadded vice that will protect the rodfinish. If a locknut holds the piston tothe rod, loosen and remove locknut.7. If no locknut is present, heat thepiston to approximately 350 F with atorch or in an oven to break theanaerobic adhesive. Insert aspanner wrench in the drilled holeson the piston face and break the sealby rapping the wrench with a rubbermallet, rotating the piston in acounterclockwise direction.CAUTIONTHE PISTON IS HOT!8. Unscrew the piston and set it aside.9. Remove the cushion collar from therod, if the cylinder is cushioned onthe head end. Let the rod cool beforere-assembly.10. Snugly secure the rod into the vice.Replace the cushion collar on therod (if required). Thoroughly clean allmetallic surfaces with anon-petroleum based cleaner and awire brush, if necessary.11. Apply anaerobic adhesive near therod shoulder (or collar) on the rodthreads and on the piston I.D.threads.NOTEBe sure to follow the adhesivemanufacturer’srecommendations regardingsurface preparation, primingrequirements, proper adhesivefor the thread size, and cure timeprior to pressurization. Failure todo so could result in impropersealing and retention.