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 TM 5-2805-261-13
LOCATION/ITEM
ACTION
REMARKS
5-15.
GEARCASE PRESSURE AND VACUUM TESTS - continued
VACUUM TEST
1.
Vacuum test group
Screw into drain/fill
plug hole.
2.
Vacuum test group
Pump out to 19-32 in.
Watch gage. If mercury drops (vacuum doesn't hold)
(76-127 mm) of mercury.
there is a leak in the gearcase.
3.
Oil
Put around area of
If oil is drawn in or if leak stops, the seal in that area
suspected leak.
is defective and must be replaced. If there are no leaks
proceed to step 4.
4.
Vacuum test group
Pump out to 97 in. (381 mm)
If gage pressure drops perform step 3.
of mercury.
5.
Gearcase
Repair as necessary.
Figure 5-26. Gearcase pressure test
5-59
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