(b) Remove the O-rings (15, 16, 18, 19,
in the end opposite the spring and push the spring (2)
and piston (3) out.
21, 22) and backup rings (14, 17, 20, 23) from the
CAUTION
pressure plates (25, 39). Remove the fillister head
Be careful not to score the valve bore.
screws (31, 33) and lift off the wear plates (29, 35). Note
the position of the rings (28, 36), rotors (27, 38) and
(2) Outrigger and front axle oscillate lockout
vanes (26, 37) intra vanes (40) locating pins (30, 34) and
pump.
pressure plates (25, 39).
(a) Mark the cover (1, fig. 5-29B), and
d. Cleaning, Inspection and Repair.
ring (19) and body (13) before disassembly. Note the
(1) Discard the shaft seal and O-rings. Use
direction of arrow cast into the ring. The arrow indicates
new parts for reassembly. Clean the metal parts in a
the direction of pump rotation.
clean mineral oil solvent, blow them dry with filtered
(b) Clamp the pump in a vise with
compressed air and place on a clean surface for
protective jaws, cover end up. Remove the four cover
inspection.
screws (20) and lift off the cover (1). Remove the
(2) Check the wearing surfaces of the
cartridge (15)from the body (13). Separate the pressure
cartridge parts for scoring and excessive wear. Remove
plate (3)from ring (19) and body (13). Carefully pull the
light score marks by lapping. Replace a heavily scored
rotor (18) and vanes (17) out of the ring and disassemble
or badly worn parts.
the components. Note the contour of the rotor vanes in
NOTE
order to avoid error in reassembly. The contour faces
If cartridge parts are badly worn, it is
out. Remove the O-rings (6) from the pressure plate and
advisable that new parts be used.
body.
(c) Remove snap ring (12) next to the
(3) Inspect the vanes for burrs, wear and
shaft bearing (9) from the body, then tap the shaft (10)
excessive play in the rotor slots. Carefully dress down
and bearing assembly out. If it is necessary to remove
burrs with a medium India stone. Replace the rotor if the
the small snap ring (8) and bearing from the shaft,
slots are worn. Replace vanes with a new vane kit if
support the bearing inner race in an arbor press, remove
vane tips are scored.
snap ring and press bearing of the shaft. Remove shaft
(4) Rotate the bearing on the shaft while
seal and wiper assembly (5) from the body.
applying pressure to check for wear, looseness,
(3) Dual hydraulic pumps, utility blade and fan
roughness and pitted or cracked races.
drive pump and steering system pump.
(5) Inspect the seal and bushing mating
NOTE
surfaces on the shaft for scoring or wear. Replace the
The dual pumps are identical in
shaft if marks cannot be removed by light polishing.
construction
and
maintenance
(6) Be sure that any paint or burrs raised on
procedures are the same for both. Mark
the body and cover mating surfaces are removed before
the pump body (10, figure 5-29c), inlet
assembly.
e. Reassembly.
housing (4) and cover (2) for correct re-
(1) Emergency steering pump.
assembly. Note the direction of the
arrow cast into the ring (36). The arrow
NOTE
indicates the direction of pump rotation.
Coat all parts with clean OE10 to
facilitate reassembly and provide initial
(a) Clamp the pump body in a vise with
lubrications.
Use small amounts of
protective jaws. Remove the four cover bolts (1) and lift
petroleum jelly to hold O-rings in place
the cover off the pump. Remove the cover O-ring (21),
during assembly. Soak shaft seal and
pull and or pry out the cover end cartridge assembly (32).
wiper assembly (11, fig 5-28B) in oil
before assembly.
Remove the four bolts (3) attaching inlet housing to the
body. Lift off the inlet housing and the body O-ring (16).
Turn the shaft to free the large cartridge (24) from the
(a) Install piston (3, fig. 5-28B) and
spring (2) and replace pipe plugs (1 and 22). If a sealing
body. Remove the lock ring (5) and pull the shaft (8) and
compound is used, exercise care that none gets into the
bearing (7). Drive the shaft seal (13) and wiper (12) out
from the shaft end of the body. It is necessary to remove
valve bore.
the shaft bearing, remove the snap ring (6) and press the
(b) Install shaft seal and wiper assembly
shaft out of the bearing, supporting the bearing inner
in the body (16) and press it into the body. The spring on
the shaft seal must be toward the bearing.
Place
race.
the washer .in the body against the shaft seal.
(c) Support the bearing inner race and
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