Operating Instruction Manual:
OM-HVL-01
Serial Numbers:
From: AF0324
12
10.0 Troubleshooting
The Hi-Force HVL electric-driven hydraulic pump should be serviced and repaired only by authorised Hi-
Force repair centres. The following table gives possible causes and solutions for common problems.
TROUBLESHOOTING GUIDE
Problem
Possible Cause
Solution
1. Piston will not
advance.
a. Pump release valve open.
Close pump release valve.
b. Coupler not fully tightened.
Tighten coupler.
c. Oil level in pump is low.
Add oil to pump reservoir.
d. Pump malfunctioning.
Repair or replace pump.
e. Load is too heavy for cylinder.
Use correctly rated cylinder for load.
f. Cylinder seals leaking.
Repair or replace cylinder.
2. Cylinder advances part
way.
a. Oil level in pump is low.
Add oil to pump reservoir.
b. Coupler not fully tightened.
Tighten coupler.
c. Cylinder piston binding.
Repair or replace cylinder.
3. Cylinder advances in
spurts.
a. Air in hydraulic system.
Bleed air from system. (
See section 5.3
)
b. Cylinder piston binding.
Repair or replace cylinder.
4. Cylinder advances
slower than normal.
a. Leaking connection.
Replace faulty component.
b. Coupler not fully tightened.
Tighten coupler.
c. Pump malfunctioning.
Repair or replace pump.
5. Cylinder advances, but
will not hold.
a. Pump malfunctioning.
Repair or replace pump.
b. Leaking connection.
Replace faulty component.
c. Incorrect system setup.
Check system setup.
d. Cylinder seals leaking.
Repair or replace cylinder.
6. Cylinder leaks oil.
a. Worn or damaged seals.
Repair or replace cylinder.
b. Internal cylinder damage.
Repair or replace cylinder.
c. Loose connection.
Tighten or repair connection.
7. Cylinder will not retract
or retracts slower than
normal.
a. Pump release valve is closed.
Open pump release valve.
b. Coupler not fully tightened.
Tighten coupler.
c. Pump reservoir over-filled.
Drain excess oil from pump reservoir.
d. Narrow hose restricting flow.
Replace with larger diameter hose.
e. Cylinder damaged internally.
Repair or replace cylinder.
