POCLAIN HYDRAULICS
677777845L DOC-REPAIR-MS02-MS18-FR-EN 7
Trouble shooting
DAMAGE
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IRON PARTICLES
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DETECTION BY FILTERS
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PREVENTION……
Troubles Causes Remedies
Regular rum-
bling
Worm bearing support Replace the bearing support
Without
load
Vibrations
Mountings and/or hydraulic
piping becoming loose
Tighten to torque
Clattering Boost pressure too low
Check the setting and condi-
tion of counter-pressure valve
NOISY MOTOR
Under load
Cavitation Excessive internal leaks
Replace the cylinders- block
and distribution valve assem-
bly
No supply to the motor
Check pump drive and pump
inlet
The circuit does not reach
working pressure
Check condition of safety
valve (regulator)
Excessive internal leaks
Replace the cylinders block
and distribution valve assem-
bly
THE MOTOR DOES
NOT REVOLVE
The brake stays engaged
Check the brake pilot circuit
Pump flow is too low
Check drive speed and condi-
tion of the pump
Excessive internal leaks
Check condition of cylinders-
block and distribution valve
assembly
THE MOTOR DOES
NOT REVOLVE AT
ITS NORMAL SPEED
UNDER LOAD
Working pressure is too
low
Check safety valve setting
pressure (regulator)
Irregular flow Check the pump flow
THE MOTOR RE-
VOLVES IRREGU-
LARLY
Excessive leaks
Check condition of cylinders-
block and distribution valve
assembly
Too high casing pressure
Check the leakage circuit and
filter condition
Seals damaged Replace seals
EXTERNAL OIL
LEAKS
Incorrect assembling
Check tightening of mounting
screws, bleed screws and un-
ions
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