TM 5-3895-373-34
E.
ASSEMBLE Continued.
5.
INSTALL SERVO PISTON.
a.
Turn end cap assembly housing on side.
Hydraulic oil can be moderately flammable
and can be an irritant to the skin, eyes, and
respiratory
system.
Avoid
prolonged
exposure. Eye protection and rubber
gloves must be worn when working with
hydraulic oil.
b.
Lubricate servo piston (108) with clean hydraulic
oil.
Sharp edges on end cap assembly housing
can damage piston ring during servo piston
installation. Do not slide servo piston
through end cap assembly housing further
than necessary to install piston ring. Poor
or erratic pump operation can result from
damage to piston rings.
Ensure servo piston is oriented correctly in
end cap assembly housing. Propulsion
pump cannot be correctly assembled if
servo piston is installed incorrectly.
c.
Slide servo piston (108) into end cap assembly
housing until piston emerges slightly from
opposite side.
d.
Lubricate piston ring (117) with petrolatum.
e.
Install piston ring (117) over the top of preformed
packing (118) on servo piston (108).
f.
Slide servo piston back into end cap assembly
housing.
g.
Install plugs (112) into end cap assembly
housing.
h.
Install gaskets (107).
i.
Thread servo cover (109) onto servo piston
(108).
j.
Install hex nut (111) onto servo cover (109). Do
not tighten at this time.
k.
Install hex head cap screws (104) through lift
brackets (105), servo covers (106 and 109), and
gaskets (107) into end cap assembly housing.
Tighten cap screws to 11 lb-ft (16 N•m) using
screwdriver bit set.
NOTE
Centering the servo piston is a preliminary
neutral adjustment. Final adjustment is
made during calibration, after propulsion
pump is installed and connected to the
engine.
I. Position servo piston in approximate center of
travel by turning special screw (113) with an
allen wrench. Install cap (110).
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