Enerpac ZU4T-Series - Manuel (Page 11)

11
9.0 TROUBLESHOOTING
Only qualifi ed 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.
Troubleshooting Guide*
Problem Possible Cause Action
Pump will not start. Fault condition. See Section 6.6, LCD Fault Conditions.
Motor brushes worn to end of life
(ZU4 Models only). See Section 7.3, Motor Brush Replacement.
Pendant does not function. Pump in LOCAL mode. See Section 6.5 M, Local Menu.
Pendant damaged. See Section 6.5 O, Diagnose Menu.
See authorized service center.
Motor stops under load. Low voltage. See Section 6.5 J and 6.7.
Turn off other electric loads.
Use heavier gauge extension cord.
Solenoid valve will not operate. No power to pump or wrong voltage. Connect to correct power source per pump nameplate.
Solenoid cable disconnected or damaged. Connect, repair, or replace cable.
Solenoid coil not operational. See authorized service center.
Valve out of adjustment or malfunctioning. See authorized service center.
Pump fails to build pressure or less
than full pressure. Low oil level. Add oil per Section 4.3.
Relief valve set too low. Adjust per Section 5.2.
External system leak. Inspect and repair or replace.
Internal leak in pump.
See authorized service center. Internal leak in valve.
Internal leak in system component.
Pump builds full pressure, but torque
wrench does not advance. Torque greater than wrench capacity at full
pressure. Use torque wrench with larger capacity.
Advance fl ow to wrench restricted or
blocked. Check couplers for full engagement per Section 4.5.
Torque wrench does not auto-cycle
or cycles erratically. Automode is OFF. Turn Automode ON. See sections 5.3 and 6.5 D.
Relief valve setting at or below “HI PRESS”
value (or below the corresponding pressure
setting for the selected torque). Increase relief valve setting. See Section 5.2.
HI PRESS setting below 1400 PSI [96 bar]. Raise HI PRESS setting above 1400 PSI [96 bar].
Torque wrench will not retract. Return fl ow line restricted or blocked. Check couplers for full engagement per Section 4.5.
Run motor when retracting.
Valve malfunction. See authorized service center.
Pump runs hot. Advance or retract fl ow restricted. Check couplers for full engagement per Section 4.5.
High ambient temperature. Install heat exchanger.
* Refer as needed to sections 6.6 and 6.7 for LCD fault codes and warnings.