OM--05688
0 SERIES
MAINTENANCE & REPAIR
PAGE E -- 5
good repair and with adequate capacity
to prevent injuries to personnel or dam-
age to equipment.
Disconnect the P.T.O. shaft from the gearbox drive
shaft. Remove all the hardware securing the pump
and gearbox to the vehicle chassis. Tie and tag the
any leveling shims used under the casing mount-
ing feet to ease reassembly. Move the pump and
gearbox to a clean, well-equipped shop for mainte-
nance and repair.
Suction Head And Wear Ring Removal
The wear ring (42) can be serviced by removing the
suction head (44). Remove the nuts (49) and pull
the suction head and wear ring out of the pump
casing. Remove the suction head gasket (50).
Inspect the wear ring for excessive wear or scoring.
The wear ring is secured in the suction head by a
press fit. If replacement is required, use a small bit
to drill two holes through the ring horizontally, 180
_
apart. Use a saw and chisel to complete the cuts
through the ring, and remove it from the suction
head.
Use caution
not to damage the suction
head bore when removing the ring.
Use caution not to damage the suction
head when removing the wear ring.
Impeller And Casing Wear Ring Removal
Immobilize the impeller (2) by inserting a brass rod
through the discharge port and wedging it in the
impeller vanes.
Be careful
not to damage the im-
peller. Remove the impeller nut (43). Remove the
brass rod.
Install three 1/4-20 UNC---2B x 2-1/2 inch long cap-
screws (not supplied) in the tapped holes in the im-
peller. Use a suitable puller to remove the impeller
from the shaft (45). Retain the shaft key (46). Re-
move the impeller adjusting shims (21). Use cau-
tion when removing the impeller; tension on the
seal spring will be released as the impeller is re-
moved.
With the impeller removed, inspect the pump cas-
ing wear ring (38) for excessive wear or scoring.
The wear ring is secured in the pump casing by a
press fit. If replacement is required, use a small bit
to drill two holes through the ring horizontally, 180
_
apart. Use a saw and chisel to complete the cuts
through the ring, and remove it from the casing.
Use caution
not to damage the pump casing bore
when removing the ring.
Use caution not to damage the pump cas-
ing when removing the wear ring.
Seal Removal And Disassembly
Remove the seal spring. Lubricate the pinion shaft
(45) adjacent to the seal, and work oil up under the
rubber bellows. Slide the rotating portion of the
seal off the shaft.
Use a pair of stiff wires with hooked ends to hook
the stationary element from the back side, and pull
the element and O-ring from the seal bore in the
pump casing.
Pump Casing Removal
If the oil seal (33), housing gasket (5), or O-ring (37)
require replacement, or if the gearbox is to be dis-
assembled, remove the nuts (36) and slide the
pump casing off the shaft. Remove the pump cas-
ing gasket and O-ring.
Remove the bearing shims (34). Tie and tag the
shims, or measure and record their thickness for
ease of reassembly.
Place the pump casing (1) on a clean surface with
the suction head opening facing up, and use a
screwdriver or other suitable tool to press the oil
seal (33) from the pump casing.
If no further disassembly is required, proceed with
PUMP AND SEAL REASSEMBLY
. If the gearbox
requires disassembly, do not reassemble the
pump components at this time. Refer to
GEAR-
BOX DISASSEMBLY
and
GEARBOX REAS-
SEMBLY
, followed by
PUMP AND SEAL REAS-
SEMBLY
.
