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The Cylinder Service
Centre Ltd
Sedling road,
Wear Industrial Estate,
Washington,
Tyne & Wear,
NE38 9BZ
Trouble Shooting of Hydraulic Cylinder Failure
| Symptom | Possible Causes | Remedies |
| Piston rod scored | Contamination of the oil Contamination of the gland bearing Gland bearing failure |
Flush entire hydraulic system Change all filters Check gland bearing |
| Cylinder bore scored | Contamination of the oil Piston bearing failure |
Flush entire hydraulic system Change all filters Check piston head bearing |
| Bent piston rod | Operation problem: possible overload Outside impact Under specification of piston rod |
Check operation parameters Increase rod specification |
| Split weld on base and ports | Shock loading Poor original weld |
Check operation parameters M/c off & re-weld correctly |
| Eye bearing broken | Shock loading Under specification of bearing Overloading of cylinder |
Check operation parameters Increase bearing specification Increase clevis pin size |
| Rod worn on one side | Lack of bearing support Too much side load Rod too small |
Increase bearing area Change operation Increase rod size Incorporate external guides |
| Gland blown out | Possible intensification of internal pressure Threads worn Deformation of cylinder tube |
Check hydraulic valve operation Check threads Check tube for oviality & thread wear |
| Leaking from around the gland od | o-ring failure cracked gland |
Check clearances Fit back-up ring to o-ring Crack test gland |
| Piston rod pitting | Corrosion | Upgrade rod material to marine specification Protect rod from weather |
| Barrel internally corroded | Water in the oil |
Change oil Protect from water ingress |
| Regular seal leakage | Incorrect seals fitted Seal grooves corroded or marked Air trapped in the oil Incorrect metalwork clearances Contamination of the oil Seals fitted incorrectly Seal housing sizes incorrect |
Check seal compatibility with conditions Check all seal grooves for marking & corrosion Make sure cylinder is bled correctly Check oil for contamination Check condition of all running surfaces |
| Cylinder is getting hot | Internal leakage | Test for internal pressure bypass Strip cylinder and inspect piston head & bore of tube Remove piston and check internal seal |
| Rod kick up at end of stroke | Internal bearing wear Incorrect alignment of piston to gland |
Strip and inspect piston head & gland bearings Check alignment of piston to gland |
| Piston rod will not retract | Internal leakagePort blockage | Strip and inspect piston head & tube Check ports and pipes for blockages Check valve operation |
| Loss of power | Internal leakage Hydraulic pump failure Valve settings incorrect |
Strip and inspect piston head & tube Check pump & valves |
| Slip stick or juddering | Lack of lubricant for the gland bearing & seals | Rough surface finishes on rod or tube Lack of hydraulic pressure Vacuuming or air entrapment Bearing tolerances too tight Seals too tight |
