5
8.0 TROUBLESHOOTING
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 the authorized Enerpac Service Center in your
area. For the location of an Enerpac Service Center in
your area, go to www.enerpac.com.
SYMPTOM POSSIBLE CAUSE
Electric Models Gasoline Models
Pump will not start No power or low voltage Low on fuel or dead battery
Fouled spark plugs
Motor stalls under pressure Low voltage Throttle not fully open
Check engine operator’s manual
Electric valve will not operate No power or wrong voltage
Low voltage ————————
Valve out of adjustment
Pump fails to build pressure Piston pump lost prime
External leak in system
Internal leak in pump
Internal leak in valve
Internal leak in system component
Pump builds less than full pressure Relief valve set low
External system leak
Internal leak in pump
Internal leak in valve
Internal leak in system component
Pump builds full pressure, Load greater that cylinder capacity at full pressure
but load does not move Flow to cylinder blocked
Cylinder drifts back on its own External system leak
Internal leak in a system component
Cylinder will not return:
Single-acting type Valve malfunction
Return spring broken
Return flow restricted/blocked
No load on a “load return” cylinder
Double-acting type Valve malfunction
Return flow restricted/blocked
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