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7. Troubleshooting Guide
Refer to the troubleshooting guide when diagnosing cylinder operational problems. Please note that the
troubleshooting guide is not all-inclusive, and should be considered only as an aid to help diagnose the most
common possible problems.
For repair service, contact your nearest Enerpac Authorized Service Center. As required, also refer to the
troubleshooting information provided with your hydraulic pump or power unit.
Troubleshooting guide
Symptom
Possible Cause
Solution
1. Plunger will not advance.
a. Pump release valve open.
Close pump release valve.
b. Directional control valve not in proper position. Shift directional control valve to proper
position.
c. Coupler not fully tightened.
Tighten coupler.
d. Pump oil level is low.
Add oil to pump reservoir as required.
e. Pump malfunctioning.
Repair or replace pump as required.
f. Cylinder load rating too low for application.
Use a cylinder with a higher load rating.
g. Cylinder seals leaking.
Repair or replace cylinder.
2. Plunger advances only
part way.
a. Oil level in pump is low.
Add oil to pump reservoir as required.
b. Coupler is not fully tightened.
Tighten coupler.
c. Cylinder plunger binding.
Repair or replace cylinder.
3. Plunger advances
erratically.
a. Air in hydraulic system.
Remove air from hydraulic system.
b. Cylinder plunger binding.
Repair or replace cylinder.
4. Plunger advances more
slowly than normal.
a. Leaking connection.
Repair leaking connection.
b. Coupler not fully tightened.
Tighten coupler.
c. Pump malfunctioning.
Repair or replace pump as required.
5. Plunger advances but will
not hold.
a. Pump malfunctioning.
Repair or replace pump as required.
b. Leaking connection.
Repair leaking connection.
c. Incorrect system set-up.
Check hose connections at pump
and cylinders.
d. Cylinder seals leaking.
Repair or replace cylinder.
6. Cylinder leaks oil.
a. Worn or damaged cylinder seals.
Repair or replace cylinder.
b. Internal cylinder damage.
Repair or replace cylinder.
c. Loose connection.
Tighten or repair connection.
7. Plunger will not retract
or retracts more slowly
than normal.
a. Pump release valve opened.
Close pump release valve.
b. Directional control valve not in proper position. Shift directional control valve to
proper position.
c. Pump reservoir is overfilled.
Drain oil from pump reservoir as re-
quired.
d. Improper hose connections.
Check hose connections.
e. Narrow hose restricting oil flow.
Replace with larger diameter hose.
f. Internal cylinder damage.
Repair or replace cylinder.
g. Cylinder plunger binding and/or internal dam-
age.
Repair or replace cylinder.
h. Flow control valve closed.
Open flow control valve.
Содержание CULP10
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