1 Bolt
21
0-ring
2 Cover
22
O-ring
3 Bolt
23
Back-up ring
4 Housing
24
Cartridge kit
5 Lock ring
25
Pressure plate
6 Snap ring
26
Vane kit
7 Bearing
27
Rotor
8 Shaft
28
Ring
9 Washer
29
Wear plate
10 Body
30
Pin
11 Seal kit
31
Screw
12 Wiper
32
Cartridge kit
13 Seal
33
Screw
14 Back-up ring
34
Pin
15 O-ring
35
Wear plate
16 O-ring
36
Ring
17 Back-up ring
37
Vane kit
18 O-ring
38
Rotor
19 O-ring
39
Pressure plate
20 Back-up ring
40
Intra vane (insert)
d. Cleaning, Inspection and Repair.
NOTE
(1) Clean all metal parts with an approved
Pressure to the steering control
cleaning solvent and dry thoroughly.
system is reduced to 650 PSI. A
(2) Inspect pump body, center section and
single hydraulic pump mounted on
covers for cracks, or damaged mating surfaces.
and driven by the transmission is a
Inspect thrust plates for excessive wear, scoring, or other
"back up pump" used to supply
damage. Repair or replace defective parts.
emergency hydraulic power to the
(3) Inspect pump gears and shafts for
steering system in case of engine
scoring, excessive wear, chipped or cracked teeth or
failure. A single 11.6 GPM pump
other damage. Repair or replace defective parts.
mounted on the rear of the carrier
(4) Inspect bearings for pitting, scoring, or
engine supplies pressure to the
outriggers and to the front axle
excessive wear. Replace defective bearings.
(5) Replace all seals, gaskets, O-rings and
oscillate lockout system.
b. Removal. Remove hydraulic pump assemblies
damaged or defective hardware.
e. Reassembly. Reassemble hydraulic pumps in
(TM 5-3810-232-12).
c. Disassembly.
reverse of numerical sequence illustrated on figures 5-28
(1) Emergency steering pump.
and 5-29.
5-25. Hydraulic Pump Assemblies (Model 2385)
(a) Mark the cover (5 fig. 5-28B) the
a. General.
There are four hydraulic pump
ring (21) and the body (16) before disassembly. Note the
assemblies in the hydraulic system (fig. 1-3B). There
direction of arrow cast into the ring. The arrow indicates
are two dual pumps and one single pump mounted on
the direction of arrow cast into the ring. The arrow
and driven by the torque converter. The single pump
indicates the direction of pump rotation.
mounted on the converter is a gear type and is used to
Insert a screwdriver in the control valve bore
(b)
charge the converter and transmission and is not
Clamp pump in a vise with protective jaws, cover end up.
considered a part of the hydraulic system being
Remove the four cover screws (4) and lift off the cover
discussed here. One dual pump with a capacity of 21
(5). Remove the cartridge (18) from the body (16).
GPM per pump supplies hydraulic for the steering
Separate the pressure plate (7) from ring (21) and body
cylinders. One side of the dual pump supplies hydraulic
(16). Carefully pull the rotor (20) and vanes (19) out of
pressure for front wheel steer cylinders, the other side
the ring and disassemble the components. Note the
supplies pressure for the rear steer cylinders. The
contour of the rotor vanes in order to avoid error in
second dual pump mounted on the torque convertor has
reassembly. The contour faces out. Remove the O-ring
different capacities. One side of this dual pump rated at
(10) from the pressure plate and body.
38 GPM supplies hydraulic pressure for the utility blade
(c) Remove snap ring (15) next to shaft
and the steering control system; the other side, rated at
bearing (13) from the body, then tap the shaft (14) and
21 GPM supplies hydraulic pressure to the fan motor.
bearing and bearing assembly out. If it is necessary to
remove the small snap ring (12) and bearing from the
shaft, support the bearing inner race in a arbor press,
remove snap ring and press bearing off the shaft.
Remove shaft seal and wiper assembly (11) from the
body.
(d) Remove the pipe plugs (1 and 22).
5-63
