Assembly - Eaton Heavy Duty 2 Series Manual

Assembly

*Note: Before re-assembly, clean all parts and sub-assemblies. Inspect and replace damaged parts and
subassemblies. When reworking parts, do not use course grit paper, files or grinders on finished
surfaces. Replace all gaskets and seals. Lubricate all seals with petroleum jelly for retention during
reassembly. Freely lubricate all bearings and finished surfaces with clean hydraulic fluid.
Servo Piston Installation
34 EATON Heavy-Duty Series 2 Hydrostatic Pumps Parts and Repair E-PUPI-TS004-E October 2004
1. When replacement of
the front bearing cup
is necessary, simply
place it in the pump
housing.
2. Lubricate and care -
fully install two new
O-ring seals and back-
up rings into the
servo piston bore of
the pump housing.
Install the black seal-
ing ring first, then the
blue back-up ring. Be
careful not to twist or
kink the seals.
3. Lubricate and install
new seals on both
servo piston covers.
4. Place the servo piston
cover on the servo
piston adjustment
screw. Screw about
half way down the
screw. Install a new
threaded seal and
beveled washer. Place
the threaded seal first,
then the washer. The
beveled side of the
washer must face the
seal.
5. Screw the lock nut on
the servo piston
adjustment screw. DO
NOT TIGHTEN the lock
nut at this time.
6. Lubricate and install
the servo piston into
the pump housing.
Place into the side
opposite the speed
sensor port. The flat
side of the servo
piston must be
perpendicular to, and
facing, the center of
the pump housing.
Install the four servo
cover retaining cap
screws. Torque cap
screws to 16 ft. lbs.
[21,7 Nm] to 17 ft. lbs.
[23 Nm].
7. Using a square, check
to make sure the flat
side of the servo
piston is perpen -
dicular to the pump
housing face.
8. Install the remaining
servo piston cover
and remaining four
servo cover retaining
cap screws. Torque
cap screws to 16 ft.
lbs. [21,7 Nm] to 17 ft.
lbs. [23 Nm].