Enerpac ZUTP-Series - Manual (Page 6)

6
Troubleshooting Guide
Problem Possible Cause Action
Pump will not start. No power. Connect power.
Pump circuit breaker tripped. Push pump circuit breaker button to reset.
Low voltage. Turn off other electric loads.
Use heavier gauge extension cord.
Motor brushes worn to end of life. Replace brushes per Section 6.4.
Pump element jammed. See authorized service center.
Pendant damage. Repair pendant.
See authorized service center.
Motor stops under load. Low voltage. Turn off other electric loads.
Use heavier gauge extension cord.
Pump fails to build pressure or
builds less than full pressure. Low oil level in reservoir. Add oil per Section 4.2.
Relief valve setting too low. Adjust per Section 5.3.
External system leak. Inspect and repair or replace.
Pump pressure release valve open or not fully
closed. Close pressure release valve.
Pump hydraulic intake screen dirty. Clean or replace hydraulic intake screen.
Change hydraulic oil. See Section 6.2.
Internal leak in pump pressure release valve. See authorized service center.
Internal leak in system component. See authorized service center.
Pump builds full pressure, but tool
does not move. Load greater than tool capacity at full pressure. Reduce load or add tool capacity.
Flow to tool blocked. Check hydraulic couplers for full engagement.
Check hose for blockage or kinks.
Low oil fl ow. Pump hydraulic intake screen dirty. Clean or replace hydraulic intake screen.
Change hydraulic oil. See Section 6.2.
Tool drifts back on its own. External system leak. Inspect all hydraulic connections and replace or repair.
Pump check valve malfunctioning. See authorized service center.
Internal leak in a system component. See authorized service center.
Tool will not return when
pressure is relieved. Tool is not spring return. Manually retract tool as required.
Flow restricted or blocked. Check hydraulic couplers for full engagement.
Check hose for blockage or kinks.
Pump hydraulic return fi lter dirty. Clean or replace hydraulic return fi lter element.
Pressure release valve malfunction. See authorized service center.
Return spring broken.
(tools equipped with return spring only) See authorized service center.
Pump runs hot. Flow restricted. Check hydraulic couplers for full engagement.
Check hose for blockage or kinks.
7.0 TROUBLESHOOTING
Only qualifi ed hydraulic technicians should service the pump or system components. A system failure is not necessarily the result of
a pump malfunction. To determine the cause of the problem, the complete system must be considered in any diagnostic procedure.
The following troubleshooting chart is intended to be used only as an aid in determining if a problem exists. For repair service, contact
your Enerpac Authorized Service Center.