Model: 02-7839-0111
18 Ton Single Stage Jack
09/2001 – Rev. 01
- 4 -
6.0 MAINTENANCE
6.2 REMOVING AND SERVICING PUMP
5. Remove clevis pin assembly. (Item 18).
6. Remove four (4) socket head cap screws.
7. Remove flanges.
8. Remove tube assembly. (Item 16).
9. Replace O-rings and backup ring. (See Appendix I: HC-1752 for kits available).
10. Re-assemble in reverse order.
6.3 JACK FUNCTION LOAD TEST
NOTE:
If function load testing is required:
1. Take all necessary precautions to prevent injury.
2. Always jack against a load and never against the jack itself.
3. Do not exceed a test load equal to the jack rated capacity plus 10%.
7.0 TROUBLE SHOOTING
R
AM WILL NOT RISE OR RISES ERRATICALLY
P
ROBABLE
C
AUSE
C
ORRECTIVE
A
CTION
High pressure leaks (at joint, plugs or tubing)
Re-tighten or repair
Leaky discharge check valve
Pump rapidly to dislodge;
Or repair pump
Leaky ram O-ring packing
Replace packing
Leaky release valve
Tighten release valve
Leaky pump O-ring packing
Repair pump
Lack of oil
Refill reservoir check system for leaks
Sticking inlet check valve
Pump rapidly to dislodge;
Or repair pump
Closed air vent
Open air vent
Air under ram
Bleed system
J
ACK WILL NOT LOWER
P
ROBABLE
C
AUSE
C
ORRECTIVE
A
CTION
Ram locknut not in correct position
Rotate nut to top of ram
Broken pump release valve
Repair pump
Bent ram
Replace suspected ram assembly
Parts List Index
Replacement Parts ..............................................5
Replacement Kits ...............................................6
Parts List Illustrations.................................. 7
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