Model: 02A7874C0110
20 Ton Two Stage Jack
10/2012 | Rev. 02
Page | 7
9.2
MAINTENANCE SCHEDULE
(continued)
9.2.1
Storage/Low Usage
If jack is unused for 90 days, raise ram to full hydraulic extension, spray ram with DoALL RPM, LPS or equivalent water
repellant, BUNA N compatible lubricant.
9.3
REMOVING AND SERVICING PUMP
NOTE: If pump is found faulty, call the factory for replacement or replace seals as follows:
1. Review Appendix III HC-1961 Hand Pump Parts List.
2. Clamp suction (push on) hose and remove hose from pump.
3. Uncouple fittings of hydraulic hoses from pump.
4. Remove pump from jack.
5. Remove cotter pin from clevis pin.
6. Remove four (4) socket head cap screws.
7. Remove flanges.
8. Remove tube assembly.
9. Replace O-rings and backup ring. (See Appendix III for kits available.)
10. Re-assemble in reverse order.
9.4
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%.
9.5
PNEUMATIC PUMP
See Appendix II Haskel Air Pump Manufacturer Data for complete parts list and repair information.
10.0
TROUBLE SHOOTING
TROUBLE
PROBABLE CAUSE
ACTION
Fluid leakage at pump piston or
pump body
Damaged backup ring, o-ring, piston or pump
body
Remove piston and pump body. Inspect
for damage. Replace defective part(s).
Replace removed o-ring and backup ring
External fluid leakage at rams
Damaged o-ring, backup ring or inner cylinder
wall
Remove rams as a unit from cylinder.
Inspect parts. Replace o-ring and
defective part(s)
Jack fails to lift rated load
Release valve not closed properly
Fully tighten release valve
Low fluid level
Fill to correct fluid level
Pressure relief valve improperly adjusted
Adjust or replace release valve
Leakage at inlet or outlet check ball
Inspect valve body for wear or replace
valve body and check balls
Vent screw closed
Open vent screw
Rams will not support load after
manual or pneumatic pump up
Leaking ram o-ring seals
Check for external leakage, if present
replace defective seal and back up ring
Leaking pressure check valve
Inspect valve body for wear or replace
valve body and check balls
Leaking pressure relief valve
Remove release valve, inspect ball and
ball seat in pump block. Replace effective
part(s)
Rams raise and fall with each
manual pump stroke
Release valve open
Fully tighten release valve
Inlet check valve not seated or sticking
Pump rapidly to dislodge or replace valve
body
Pressure check valve not seated or sticking
Pump rapidly to dislodge or replace valve
body
Jack fails to lower
Ram locknut not loosened
Raise jack ¼ inch and release locknut
Vent screw closed
Open vent screw
O-Ring (pinched or rolled)
Replace o-ring and back-up ring, clean up
cylinder wall of debris
Summary of Contents for 02A7874C0110
Page 2: ...REVISION DATE TEXT AFFECTED 01 10 2010 Original Release 02 10 2012 Modified Parts List...
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Page 17: ...APPENDIX I Hydraulic Schematic...
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Page 49: ...APPENDIX III HC 1961 Hand Pump Parts List...
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Page 59: ...APPENDIX I Safety Data Sheet MIL PRF 5606 Hydraulic Fluid...
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