53
5.2.5 BREATHER CLEANING
Each gearbox is equipped with a breather in the ll
plug that vents the internal pressure to atmosphere.
As the gearbox temperature increases and decreas-
es during the operating and stopped modes, the
pressure in the gearbox will increase or decrease if
it is not vented to atmosphere. An increase in internal
pressure will cause the shaft seals to leak until the
gearbox runs low on or out of oil. To check on or clean
the breather, follow this procedure:
1. Place all controls in their OFF or neutral position.
2. Turn the power OFF at the master panel and
lock-out.
3. Remove the ll plug/breather from the gearbox.
4. Check that the vent passage through the plug is
open.
5. If plugged, soak in a solvent over night.
6. Use a high-pressure air hose to blow the passage
open. Use a probe to clear the passage if the hole
is caked with dirt.
7. Install and tighten the breather plug.
IMPORTANT
Always clean the breather if any leaks
are noticed around shafts.
Straight
Telescoping
FIG. 39 BREATHER (TYPICAL)
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