Enerpac ZA4T-Series - Manual (Page 6)

6
Trouble-shooting Guide
Problem
Pump will not start
Motor stalls under load
Pump fails to build pressure or less
than full pressure
Wrench will not retract
Low oil fl ow rate
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
Valve malfunction
Return fl ow line restricted or blocked
Inadequate air supply
Dirty air fi lter
Clogged inlet fi lter
Action
See section 5.0 Operation for details
See section 4.8
Reduce load or add cylinder capacity
Check hydraulic couplers for full engagement
Add oil per section 4.4
Adjust per section 5.4
Inspect and repair or replace
See authorized service center
See authorized service center
See authorized service center
See authorized service center
Check couplers for full engagement
See Section 4.3
See Section 6.4
See Section 6.4