ROUTINE JACK
MAINTENANCE BULLETIN
1 OF 1
To ensure proper operation of all aircraft hydraulic jacks, it is important that at a minimum,
each jack is certified on an annual basis. The following procedure is provided as an aid
to the certification process.
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.
2) Open release valve and verify ram(s) retract fully.
3) Position jack under jack tester.
4) Close release valve, and fully extend all ram(s). Open release valve:
a) Single Stage Cylinder - Lower ram 2-4 inches.
b) Multi-Stage Cylinder - Lower smallest ram
only
approximately
one inch.
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.
2222 S. Third St., Columbus, OH 43207 - Tel: 614 443 7492 - Fax 614 444 9337 - email: [email protected] - www.columbusjack.com
West Coast Office: 369 Cliffwood Park St. Unit D, Brea, CA 92821 - Tel: 714 257 9412 - Fax 714 257 9385
TO PROVIDE COMPLETE INFORMATION ON SERVICING
ColumbusJACK/REGENT QUALITY GROUND HANDLING EQUIPMENT
RECOMMENDED ANNUAL JACK CERTIFICATION PROCEDURE
RJM 147
