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TM 55-1520-240-23-4
5-5
PRESSURE TEST ROTARY-WING HEAD SEALS AND PACKINGS
(Continued)
5-5
NOTE
Test setup and procedure are same
for testing all rotary-wing head seals
and packings, except for size of
pressurizing filling and location of test
connection.
TEST ROTARY-WING HUB OIL SEALS AND
PACKINGS
1.
Check oil level in sight indicator (1). Service oil
tank (2) if needed (Task 1-56).
2.
Remove one filler plug (3) and packing (4). Install
pressurizing fitting (5) and packing in tank (2).
Connect test setup (6) to pressurizing fitting.
Do not exceed 20 psi when testing
seals. High-pressure air will damage
seals.
3.
Pressurize tank (2) to 3 to 5 psi. Maintain
pressure for 10 minutes. Check hub (7) for oil
leaks. Check around pitch shaft (8) and end
covers (9). There shall be no leaks.
4.
Increase pressure in tank (2) to 15 to 20 psi.
Maintain pressure for 5 minutes. Check hub (7)
for oil leaks. Check around pitch shaft (8) and
end covers (9). There shall be no oil leaks.
5-27
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