| Freeing Gast
Air Motors that Seize (Tech Document HTD-9913)
If your Gast Air Motor has seized due to rust, the most likely
cause is moisture in the air supply. This moisture problem needs
to be corrected or the problem will recur. To free the motor, follow
these instructions:
- Remove the fittings from both ports of the air motor.
- Pour a generous quantity of penetrating lubricant into both
ports. Hannay Reels recommends Marvel Air Tool Oil or equivalent.
The oil should be allowed to work for at least 12 hours.
- Gently rock the motor shaft back and forth the next day with
a wrench. In most cases, you will find that the oil has freed
up the shaft. However, in some cases you will have to loosen all
of the screws on the back cover plate of the motor and repeat
the rocking procedure. It’s best not to remove the cover
plate completely, as there is a thin, delicate gasket behind this
plate that can become easily damaged.
- Run the newly freed motor for several minutes with a dry (but
lubricated) air source. During this time, you should periodically
stop the motor and inject more penetrating lubricant into the
motor ports. After several minutes of doing this, you should be
able to safely switch over to #10 high detergent motor oil, which
should be used in the oiler of the regular air supply system for
normal operation.
- If all of the above fails, the motor will probably need to be sent
back for repair or replacement.
It can not be emphasized enough that a DRY, properly lubricated,
properly filtered air supply is critical to the proper operation
of an air motor. Install an air line moisture trap. It is also quite
important to run the air motor somewhat frequently, as this will
keep the motor properly lubricated.
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