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Routine Jack Maintenance Bulletin
TO PROVIDE COMPLETE INFORMATION ON SERVICING
ColumbusJACK/REGENT QUALITY GROUND HANDLING EQUIPMENT
BULLETIN RJM 147
– RECOMMENDED ANNUAL JACK CERTICIFATION PROCEDURE
The following Recommended Annual Jack Certification Procedure is provided as a guide to insure that hydraulic aircraft jacks
are always certified for operation. An annual time interval is a general recommendation only. The actual interval used should
include factors for the climatic conditions in which the equipment is stored and the frequency of equipment use.
Recommendations for Suggested Preventative Maintenance can be found in RJM 170.
1. With no external load applied to the jack, fully close release valve and fully extend ram(s) to verify function and the
absence of external hydraulic leakage.
WARNING!
DO NOT APPLY PRESSURE AGAINST INTERNAL RAM STOP(S).
2. Open release valve and verify ram(s) retract fully.
3. Position jack under jack tester.
NOTE: For tripod jacks, all leg extensions should be installed on the jack.
4. Close release valve, and extend ram(s) until cup adapter contacts jack tester. Make sure that the ram of a single stage
jack is partially extended and that the smaller ram of a multi-stage jack is partially extended.
5. Pressurize the jack against the jack tester. Using a calibrated pressure gauge on either the jack or the jack tester, monitor
the pressure until the capacity (operating pressure) of the jack is reached.
6. With the jack pressurized against the jack tester, hold in this position for 3 minutes. Verify that the jack pressure has not
decreased, indicating internal leakage.
7. Open the release valve to relieve jack pressure against the jack tester.
8. Set the safety relief valve per jack operation and maintenance manual.
Summary of Contents for Columbus Jack 2295-10PR
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