Model: 02-7839-0111
18 Ton Single Stage Jack
09/2001 – Rev. 01
- 3 -
6.0 MAINTENANCE
GENERAL
•
All maintenance and/or repair work should be done using good workmanship practices and proper tools.
•
The work area should be clean and free of dirt.
•
When O-rings and backup rings are removed, every effort should be made to avoid the contact of tools
with the critical surfaces of parts. Surface deformities could cause degradation of seals and failure.
•
It is good practice to replace both O-rings and backup rings once removed. Cut and damaged O-rings
normally result in fluid leakage.
•
If cylinder bore is found to be rusty, it may be honed to a maximum diameter of 4.506 inches and a
surface finish of 16 micro inches. If pitting in the bore cannot be removed by this process, the jack
cylinder must be replaced before the jack can be returned to service.
•
At this time flush old hydraulic fluid and dirt from overall system and replenish with new, clean
hydraulic fluid.
90-Day Routine Maintenance
If jack is not being used on a regular basis, every 90 days the jack should be fully extended and retracted to
exercise the seals and to prevent rust build up on the cylinder inside diameter. While ram is extended, clean
the threads and spray with DoALL RPM, LPS, or equivalent that is water repellent and will not harm
BUNA "N" O-rings.
6.1 SERVICING JACK
To Disassemble Jack:
1. Remove mounting plate (Item 9) by unscrewing five (5) socket head cap screws (Item 7).
2. Raise ram assembly (Item 8) to the point where it can be lifted from the jack cylinder.
To Re-assemble Jack:
1.
Re-assemble in reverse order of above.
Note: Torque five (5) socket head cap screws (Item 7) to
100 ft-lbs.
2. Spray inside diameter of cylinder and outside diameter of ram (Items 1 & 8) with DoALL RPM,
LPS or equivalent water repellent that will not harm the BUNA "N" O-rings to protect surfaces
from rusting when not in use.
NOTE:
To minimize air entrapment under the ram, raise the oil level in the cylinder to
chamfer of the cylinder prior to ram insertion.
6.2 REMOVING AND SERVICING PUMP
NOTE:
If pump is found faulty, call the factory for replacement or replace seals as follows:
1. Review Appendix I: HC-1752 Hand Pump Parts List.
2. Clamp suction (push on) hose and remove hose from pump.
3. Uncouple fitting of hydraulic hose from pump.
4. Remove pump from jack.
6.2 Removing and Servicing Pump continued on following page.
