LUBRICATION ORDER
LO 9-2350-261-12
10 JULY 1990
(Supersedes LO 9-2350-261-12, July 1985)
NOTES
CAUTION
Use only FRH hydraulic fluid. Do not mix
1.
FAN GEARBOX. Daily check fan gearbox oil
different types of hydraulic fluids. Do NOT
level. Add OE/HDO or OEA, as needed, to
overfill.
bring oil level to center of sight glass.
2.
FAN GEARBOX OIL DRAIN.
Drain fan
CAUTION
gearbox every 1500 miles or semiannually, as
Do NOT grease pivot steer bleeder valves.
follows:
3.
PIVOT STEER SYSTEM. Remove plugs
NOTE
and check fluid level in both master
Drain oil only when hot after operation.
cylinders every 150 hours, 1500 miles, or
semiannually (TM 9-2350-261-20). Add
a.
Place suitable container under fan
fluid, as required, to bring fluid within 1/2 to
gearbox drain.
3/4 inch from top of cylinder.
b.
Remove drain plug and preformed
4.
PIVOT STEER FLUSH. Flush pivot steer
packing from gearbox housing and drain
system,
when
hydraulic
fluid
is
oil into container. Discard packing.
contaminated or when fluid type is
c.
Check drain plug and oil for metallic
changed, as follows:
particles and foreign matter. If metal
a. Remove fill plugs, open bleeder
chips are found, notify unit maintenance.
valves, and drain hydraulic fluid into a
d.
Clean drain plug and apply antiseize
suitable container.
compound (TM 9-2350-261-20).
b. Close bleeder valves and fill pivot
e.
Lubricate new preformed packing with
steer system with hydraulic fluid.
OE/HDO prior to installing.
c. Bleed pivot steer system and add
f.
Install drain plug with new preformed
hydraulic fluid as needed. Install fill
packing in gearbox housing.
plugs.
g.
Fill gearbox with approximately 10 ounces
d. Move pivot steer levers back and forth
of OE/HDO to bring the level to center of
several times.
sight glass.
e. Remove fill plugs, open bleeder
valves, and drain hydraulic fluid into
WARNING
suitable container.
Fire resistant hydraulic (FRH) fluid may
f.
Close bleeder valves and fill pivot
contain Tricresyl Phosphate which, if taken
steer system with new hydraulic fluid.
g. Bleed pivot steer system and add
internally, can produce paralysis. Hydraulic
hydraulic fluid as needed. Install fill
fluid may be absorbed through the skin.
plugs.
Wear long sleeves, gloves, goggles, and face
h. Test pivot steer system.
shield. If FRH gets in eyes, wash them
immediately and get medical aid immediately.
If FRH gets on your skin, thoroughly wash
with soap and water.
Wash hands
thoroughly prior to eating or smoking.
Application of these measures is considered
an effective control of the hazard.
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