TM 55-1520-240-23-1
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SERVICE VERTICAL HINGE PIN OIL TANKS (Continued)
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CAUTION
Under normal conditions rotary heads
shall be serviced with only one type
of oil (E254 or E254.1). Oil (E254)
must be used for temperatures below
-25 F (-32 C) .
NOTE
Procedure is same to service vertical
hinge pin oil tanks on any pitch
varying housing. Upper and lower
tanks are connected by manifold tube
and are serviced together.
1.
Position blade (1) to level sight indicators (2). Tie
down one forward and one aft blade (1).
WARNING
Prolonged oil leakage can damage
finish and create a work hazard
by making the fuselage slippery. It
can also affect other systems in the
helicopter. Therefore, good judgment
must be used when determining
allowable leakage.
NOTE
If oil level in sight gage drops from full
(half-way) mark to bottom of glass in
two hours of operation, leakage is too
great. Check for source of leakage.
Repair as required.
2.
Check oil level in two sight indicators (2).
3.
Remove lockwire. Remove two filler/drain plugs
(3) and packings (4) from upper tank (5).
4.
Service tank (5) until oil reaches center of sight
indicators (2). Use lubricating oil (E254 or
E254.1) and funnel. Wear gloves (E184.1).
5.
Install packings (4) and plugs (3). Torque plugs
to 85 inch-pounds.
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