Install bearing rings (37) in the grooves of servo piston
(38). Install the two O-ring seals in the outer grooves of
the servo piston. Install one piston ring (38) over the O-
Put clean oil on the bearing rings and piston ring.
Carefully slide servo piston (36) into the servo bore of
housing (22) as shown.
Do not slide the servo piston through the housing any
farther than necessary to install the second piston ring on
the servo piston. Sharp edges on the servo bore, inside
the pump housing, can damage the first piston ring. Do
not damage the bearing ring when sliding the servo piston
back into the pump housing.
Slide the servo piston through the housing until the
piston ring groove (without a piston ring) is just exposed.
Install the remaining piston ring (38) in the groove of the
servo piston. Put clean oil on the piston ring and slide
the servo piston back into the housing.
NOTE: When installing needle bearing (35) in the
housing, the printed (numbered) end of the
bearing cage must be visible (toward the inside of
Install needle bearing (35) in housing (22). Install the
needle bearing until it protrudes 2.0 to 2.5 mm (0.08 to
0.10 in) above the inside surface of the housing.
Install locating pin (33) in the housing. Install the
locating pin until it protrudes 4.19 to 4.70 mm (0.165 to
0.185 in) above the inside surface of the housing.
Install valve plate (34) in the housing. The bronze side
of the valve plate must be visible inside the housing.
The notch on the valve plate must engage locating pin