Body System - Main Hydraulic Pump
Section 230-0050
SM 1951 4-00
2
6. Support pump assembly with suitable lifting
equipment. Remove nuts (4) and lockwashers (5)
securing pump assembly to the transmission PTO.
Remove pump assembly from the transmission PTO
and discard gasket (6).
7. Wash outside of the pump assembly thoroughly,
with a suitable solvent, and move to a clean work area
for disassembly.
DISASSEMBLY
Numbers in parentheses refer to Figs. 1.
1. Place pump assembly in a soft-jawed vice, and
clamp on body (1) casing. Match mark port body (1),
front cover (2) and mounting flange (3) to aid in
assembly.
Note: Do not clamp vice on machined surfaces of the
pump at any time.
2. Remove capscrews (16) securing mounting flange
(3) and front cover (2) together.
3. Tap mounting flange (3) with a soft hammer and
remove it from front cover (2).
Note: Do not attempt to pry the pump units apart with
a large screwdriver or pry bar. The machined surfaces
of the mounting flange (3) or front cover (2) may be
damaged.
4. Remove and discard shaft seals (18 & 20).
5. Remove capscrews (15) securing front cover (2)
and body housing (1) together.
6. Tap front cover (2) with a soft hammer and remove
from body housing (1).
Note: Do not attempt to pry the pump units apart with
a large screwdriver or pry bar. The machined surfaces
of the body housing (1) or front cover (2) may be
damaged.
7. Remove and discard ring seal (10) from body
housing (1).
8. Remove wear plate (13), wear plate seal (8) and
backup seal (9) from shaft front cover (2). Note the
position of wear plate seal (8) in wear plate (13)
groove, for proper assembly.
9. Remove driveshaft gear (11) and driven gear (12)
from body housing (1).
As driveshaft and gear (11) rotates, driven gear (12)
rotates in the opposite direction. Pockets between the
drive and driven gear teeth carry oil from inlet port 'A',
around gear housing (2) ID, to outlet port 'B'. As the
gear teeth re-mesh, oil is forced out of outlet port 'B' to
the priority valve. Refer to Section 220-0105,
PRIORITY VALVE.
The maximum oil delivery of the hydraulic pump is
fixed by the width of its respective gear set and the
speed at which driveshaft and gear (11) rotates.
Note: Never drive a pump in the wrong direction of
rotation, as pump seizure may result.
REMOVAL
Numbers in parentheses refer to Fig. 1.
WARNINGS
To prevent personal injury and property
damage, be sure wheel blocks, blocking
materials and lifting equipment are properly
secured and of adequate capacity to do the job
safely.
Hydraulic fluid pressure will remain
within the body hoist system after engine
shutdown. To prevent personal injury and
property damage, press and hold down body
hoist bleed down switch and operate the body
control joystick continually to relieve pressure
in the system.
1. Position the vehicle in a level work area, apply the
parking brake and switch off the engine.
2. Press and hold down body hoist bleed down switch
and operate the body control joystick continually to
relieve pressure in the body hoist system.
3. Block all road wheels and place the battery master
switch in the 'Off' position.
4. Remove hydraulic tank anti-spill drain cap, install
drain tube connection and drain oil into a suitable
container. Remove drain tube connection and reinstall
cap.
5. Clean pump housing and tag and disconnect inlet
and outlet lines from pump assembly. Drain oil in
hydraulic lines into a suitable container. Cap hydraulic
lines and plug pump ports to prevent ingress of dirt.
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