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TM 55-1520-240-23-4
5-5
PRESSURE TEST ROTARY-WING HEAD SEALS AND PACKINGS
(Continued)
5-5
Do not exceed 20 psi when testing
seals. High-pressure air will damage
seals.
9.
Pressurize tank (11) to 3 to 5 psi. Maintain
pressure for 10 minutes. Check inboard end of
pitch housing (15) for oil leaks. Check oil hole
(16) at tie-bar hole area under pitch housing.
There shall be no leaks.
10.
Increase pressure in tank (11) to 15 to 20 psi.
Maintain pressure for 5 minutes. Check inboard
end of pitch housing (15) for oil leaks. Check
oil hole (16) at tie-bar hole area under pitch
housing. There shall be no leaks.
11.
Loosen pressurizing filling (14) just enough to
bleed pressure. When gage pressure is 0 psi,
remove filling and packing (13).
12.
Install packing (13) and plug (12). Torque plug to
25 inch-pounds. Lockwire plug. Use lockwire
(E231).
INSPECT
TEST VERTICAL HINGE PIN OIL TANK SEALS AND
PACKINGS
13.
Check oil level in sight indicator (17). Service oil
tank (18) if needed (Task 1-59).
14.
Remove one filler plug (19) and packing (20).
Install pressurizing fitting (21) and packing in
tank (18). Connect test setup (6) to pressurizing
fitting.
Do not exceed 20 psi when testing
seals. High pressure air can damage
seals.
15.
Pressurize tank (18) to 3 to 5 psi. Maintain
pressure for 10 minutes. Check tanks (18 and
22), oil manifold (23), and lugs (24), for oil leaks.
There shall be no leaks.
16.
Increase pressure in tanks (18 and 22) to 15 to
20 psi. Maintain pressure for 5 minutes. Check
tanks, oil manifold (23), and lugs (24), for oil
leaks. There shall be no leaks.
5-29
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