Tronair 02-7825-0110, Operation & Service Manual

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Model: 02-7825-0110
20 Ton (18.14 Metric) Axle Jack
05/2004 | Rev. 04 Page | 2
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 all O-rings and backup rings once removed. Cut and damaged rings normally result in fluid
leakage.

At this time flush old hydraulic fluid and dirt from overall system and replenish with new, clean hydraulic fluid.
6.1
SERVICING JACK
To Disassemble Jack:
1. Collapse jack ram.
2. Remove vent screw and drain all fluid from reservoir.
3. Remove cap screws (Item 9) surrounding jack cylinder, then remove retaining ring (Item 10).
4. Lift cylinder from base plate weldment (Item 24). (Operate jack hand pump to help remove cylinder).
5. Remove internal retaining ring (Item 19) and unscrew piston plug, (Item 20).
6. Separate rams and replace all seals including internal ring.
To Reassemble Jack
1. Re-assemble in reverse order of above.
2. Torque each cap screw (Item 9) to 50 ft-lb (67.8 n-m).
6.2
REMOVING AND SERVICING PUMP
NOTE: If pump is found faulty, call the factory for replacement or replace seals as follows:
1. Reference Appendix I

HC-2509 Hand Pump (5900 psi/406.8 bars) Parts list during the following procedure.
2. Drain all fluid from reservoir.
3. Remove pump from jack.
4. Remove socket head cap screw from piston.
5. Remove two (2) socket head cap screws from flanges.
6. Remove flanges.
7. Remove piston.
8. Replace O-rings and backup ring. (See Appendix I for kits available.)
9. Reassemble in reverse order.
10. Torque each 3/8 inch socket head cap screw to 20

25 ft-lbs (27.1

33.9 n-m). Torque each 1/4 inch socket head cap
screw to 6

7.5 ft-lb (8.1

10.2 n-m).
6.3
JACK FUNCTION LOAD TEST
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%.