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Routine Jack Maintenance Bulletin
TO PROVIDE COMPLETE INFORMATION ON SERVICING
ColumbusJACK/REGENT QUALITY GROUND HANDLING EQUIPMENT
BULLETIN RJM 102
– PROCEDURE FOR WINTERIZATION OF HYDRAULIC AIRCRAFT JACKS
The following procedures should be utilized for optimum operational characteristics when using jacks at various temperature
extremes:
1. Above 0ºF (-18ºC) Use MIL-PRF-5606, or equal, with no further additive required.
2. At 0º to -20ºF (-18ºC to 29ºC) Use a mixture of 75% MIL-PRF-5606, or equal, and 25% kerosene.
3. Below -20ºF (-29ºC) Use a mixture of 50% MIL-PRF-5606, or equal, and 50% kerosene.
Due to most company, safety, or union regulations which restrict employees from working out-of-doors below -30ºF (-34ºC),
there is a lack of experience beyond this point. It is permissible, however, to increase the percentage of kerosene up to 100%.
As the ambient temperature increases, MIL-PRF-5606, should be added back to the system in the appropriate mixture.
The air supply should be clean and dry. At -30ºF (-34ºC), the air pump will start to react sluggishly and continue to operate less
efficiently as the temperature decreases when a normal air supply is used. The problem can be eliminated by using a dry
nitrogen source of sufficient capacity.
To ease the operation of the locknut(s) and screw extension, use "Never Freeze" by Snap-On, or equal, and apply liberally to
the thread surfaces.
Summary of Contents for Columbus Jack 2295-10PR
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