Troubleshooting Guide - Enerpac ZA4 Serie Hoja De Instrucciones

Problem
Pump will not start
Motor stalls under load
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
Trouble-shooting Guide
Possible Cause
Air turned off or line blocked
Low air pressure
Muffl er plugged; contaminated air
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 fl ow restricted or blocked
Locking valve used
Valve malfunction
Cylinder return spring broken
Return fl ow restricted or blocked
Locking valve used
Valve malfunction
Advance or retract fl ow restricted
High ambient temperature
5
Action
See section 5.0 Operation for details
See section 4.3
See section 6.4
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
Run motor while retracting
See authorized service center
See authorized service center
Check couplers for full engagement
Run motor while retracting
See authorized service center
Check couplers for full engagement
Install heat exchanger for hydraulic oil