Operating Instruction Manual:
OM-JCS-01
Serial Number:
ALL
10
9.0 Trouble Shooting
Hi-Force JCS Jack’s 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, advances
part way or erratically.
a. Release valve open.
Close release valve.
b. Load is too heavy for jack.
Use suitably rated jack.
c. Oil level is low.
Add oil to the reservoir. (See Section 5.2 )
d. Piston binding.
Repair or replace jack.
e. Jack seals leaking.
Repair or replace jack.
2. Piston advances, but
will not hold.
a. Load is too heavy for jack.
Use suitably rated jack.
b. Piston seals leaking.
Repair or replace jack.
3. Jack leaks oil.
a. Worn or damaged seals.
Repair or replace cylinder.
b. Jack damaged internally.
Repair or replace cylinder.
c. Jack over-stroked.
Stop operation and wipe away excess oil.
4. Piston will not retract
or retracts slower than
normal.
a. Release valve is closed.
Open release valve. (See section 6.2)
b. Oil reservoir over-filled.
Drain excess oil from reservoir.
c. Weak or damaged retraction spring.
Repair or replace jack.
d. Damaged or worn seals.
Repair or replace jack.
e. Jack damaged internally.
Repair or replace jack.