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 TM 5-2805-261-13
5-15. GEARCASE PRESSURE AND VACUUM TESTS
This task covers:
Testing gearcase for air and water tightness.
INITIAL SETUP
Tools:
Equipment Condition:
T11 Pressure test group - S34
Motor on test stand
T12 Adaptor 389945
Materials/Parts:
Container of water large enough to hold
gearcase
Personnel Required:
Approximate Time Required (minutes):
1 mechanic
60
LOCATION/ITEM
ACTION
REMARKS
PRESSURE TEST
NOTE
Pressure and vacuum tests
are performed at the same
time.
1.
Lower unit
Remove.
See para. 4-36, water pump
removal/installation.
2.
Remove.
See para. 3-14.
3.
Drain/fill plug
Remove.
4.
Gearcase
Drain.
NOTE
Be sure gearcase is com-
pletely empty before testing.
5.
Pressure test group
Screw into drain/fill plug
hole.
6.
Pressure test group
Pump pressure to 3-6 psi
Watch gage. If pressure drops, there is a leak in the
(21-42 kPa).
gearcase.
7.
Gearcase
Submerge in container of
Look for bubbles at source of leak.
water.
8.
Gearcase
Repair as necessary.
If there are no leaks proceed to step 9.
9.
Pressure test group
Pump pressure to 16-18 psi
If gage pressure drops perform steps 7 and 8.
(110-124 kPa).
5-58
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