Hydraulic Trouble Shooting : Cylinder Failure Guide

As cylinder failure can occur for many reasons, this hydraulic trouble shooting guide can be used to analyse the potential reasons for the fault and establish corrective actions.

This list covers the subject broadly, but is not exhaustive as it is just intended as a top level guide.

Links to more detailed cylinder troubleshooting guides are included further down this page.

 

If you need an immediate solution, call:

+44(0)191 416 6288

... or use the contact form below

If you need further assistance then please get in touch using the contact form on this page, or else by calling:

+44(0)191 416 6288

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 leakage

Port 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


This list covers the subject broadly, but is not exhaustive. If you need further assistance with hydraulic trouble shooting or cylinder failure then please get in touch using the contact form on this page or by calling:

+44(0)191 416 6288