20
Table 1 - Troubleshooting Guide (continued)
Problem Possible Cause Action
7. Pump runs hot. a. Low oil level. Check oil level with pump stopped and
cylinder or tool fully retracted. Add oil if low.
b. Flow is restricted or blocked. Check hydraulic couplers for full engagement.
Check hydraulic hose(s) for blockage or kinks.
c. Oil flowing over the relief valve for long
periods of time.
Reduce the amount of motor running time
while oil is flowing over the relief valve.
d. Pump air vents and/or cooling fins covered
with dirt.
Remove any dirt from pump air vents and
cooling fins. Be sure that all four air vents are
unobstructed.
e. Pump speed too fast. Reduce pump speed.
f. Low voltage. Check AC line voltage. Pump can operate
during a limited low voltage condition but
overheating may result.
8. Pendant LED indicator
flashes randomly at start-
up. Pump does not operate
when pendant buttons are
pressed.
a. Service center diagnostic mode activated.
The service center diagnostic mode
can be accidentally activated if the pendant
jog button is pressed down while the pump AC
power cord is being plugged into the electrical
outlet.
If the pendant LED indicator blinks randomly
yellow or red/yellow, it indicates that the pump
may be in diagnostic mode.
To exit diagnostic mode, disconnect and
reconnect AC electric power. Be sure no
pendant buttons are being pressed as the
pump AC power cord is being plugged into the
electrical outlet.
The pendant LED indicator should appear solid
green approximately 3 seconds after power
has been reconnected. This indicates that the
pump is in normal operational mode.
b. Pump electrical and/or mechanical
problems.
Contact Enerpac Authorized Service Center.
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