Trouble-shooting Guide
Problem
Possible Cause
Action
Engine will not start
Pump fails to build
pressure or less than full
pressure
Pump builds full pressure,
but load does not move
Cylinder drifts back on its
own
Single-acting cylinder will
not return
Double-acting cylinder will
not return
Pump runs hot
See engine Owner's Manual
Low oil level
Relief valve set too low
External system leak
Internal leak in pump
Internal leak in valve
Internal leak in system component
Load greater than cylinder capacity at full pressure
Flow to cylinder blocked
External system leak
Internal leak in a system component
Non-load holding valve used
No load on a "load return" cylinder
Return flow restricted or blocked
Valve malfunction
Cylinder return spring broken
Return flow restricted or blocked
Valve malfunction
Advance or retract flow restricted
See engine Owner's Manual
Add oil per section 4.4
Adjust per section 5.2
Inspect and repair or replace
See authorized service center
See authorized service center
See authorized service center
Reduce load or add cylinder capacity
Check hydraulic couplers for full engagement
Inspect all hydraulic connections and replace or repair
See authorized service center
See authorized service center
Add load
Check couplers for full engagement
See authorized service center
See authorized service center
Check couplers for full engagement
See authorized service center
Check couplers for full engagement
5
7.0 TROUBLE-SHOOTING (SEE TROUBLE-SHOOTING
GUIDE)
Only qualified hydraulic technicians should service the pump or
system components. A system failure may or may not be the
result of a pump malfunction. To determine the cause of the
problem, the complete system must be included in any
diagnostic procedure.
The following information is intended to be used only as an aid
in determining if a problem exists. For repair service, contact
your local Authorized Enerpac Service Center.
