Troubleshooting Guide - Enerpac ZU4 Classic Manual Del Usuario

Problem
Pump will not start when "ON/ADV"
button is depressed
Motor stops under load
Electric valve will not operate
Pump fails to build pressure or less
than full pressure
Pump builds full pressure, but torque
wrench does not advance
Torque wrench will not retract
Pressure trapped in hoses after
pump motor stops
Pump runs hot

Troubleshooting Guide

Possible Cause
No power
Pump on-off switch in "OFF" position
Circuit breaker tripped
Low voltage
Motor brushes worn to end of life
Pendant damage
Low voltage
No power to pump or wrong voltage
Solenoid cable disconnected or damaged
Solenoid coil not operational
Valve out of adjustment
Low oil level
Relief valve set too low
External system leak
Internal leak in pump
Internal leak in valve
Internal leak in system component
Torque greater than wrench capacity at full pressure
Advance fl ow to wrench restricted or blocked
Return fl ow line restricted or blocked
Valve malfunction
Pressure not relieved
Advance or retract fl ow restricted
High ambient temperature
Action
Connect power
Move switch to "ON" position
Push circuit breaker button
Turn off other electric loads
Use heavier gauge extension cord
See Section 6.3, Motor Brush Replacement
Repair pendant
See authorized service center
Turn off other electric loads
Use heavier gauge extension cord
Connect to correct power source per pump
nameplate
Connect, repair, or replace cable
See authorized service center
See authorized service center
Add oil per section 4.4
Adjust per section 5.7
Inspect and repair or replace
See authorized service center
Use torque wrench with larger capacity
Check couplers for full engagement per section 4.5
Check couplers for full engagement
Run motor when retracting
See authorized service center
Relieve pressure per section 5.4
Check couplers for full engagement per section 4.5
Install heat exchanger
7