Service Manual

26
310-3000 IHT
MOTOR/CENTER SECTION/
PUMP ASSEMBLY
Refer to Figures 16 and 17, (next pages).
NOTE: Brake Assembly, Input Assembly,
Charge Pump Assembly, and Lower
Housing/Filter/Manifold Assembly have
to be removed before the following steps
can be performed.
DISASSEMBLY
1. Remove washer (82), snap ring (83), washer
(82), 16T pinion gear (28), spacer (27), and
shaft (28).
2. Remove motor thrust bearing retainer (57).
3. Remove motor thrust bearing (25), and 21cc
motor cylinder block assembly (21).
4. Remove each piston (23), spring (18), and
piston seat (22) from the 21cc motor cylinder
block assembly.
5. Remove bypass plate (38) from center sec-
tion assembly (3).
6. Remove the three screws (44) from center
section assembly (3).
7. Lift center section assembly (3) out of main
housing (1).
8. Remove the two center section assembly pins
(43).
9. Remove bypass actuator (39) from the cen-
ter section (3).
10.Remove 10cc pump cylinder block assem-
bly (15).
11. Remove each piston (17), spring (18), pis-
ton seat (16) from the 10cc pump cylinder
block assembly (21).
12.Remove block spring (14), and block thrust
washer (13) from shaft (12, Figure 10)
INSPECTION
1. Inspect running surface of thrust bearing (25)
for excessive wear (grooving or smearing).
2. Inspect each piston (23), spring (18), and pis-
ton seat (22) in the motor cylinder block as-
sembly.
3. Inspect seal lands of the 21cc motor cylinder
block assembly (21) for excessive wear
(grooving or smearing).
4. Inspect the two running surfaces of center
section assembly (3) for excessive wear
(grooving or smearing). Abnormal wear pat-
terns will usually be visible. Any wear detect-
able when a fingernail is dragged across the
surface is cause for rejection.
5. Inspect each piston (17), spring (18), piston
seat (16)
6. Inspect seal lands of 10cc pump cylinder
block assembly (15) for excessive wear
(grooving or smearing).
ASSEMBLY
1. Install pump cylinder block thrust washer (13)
and spring (14) onto input shaft assembly
(12).
2. Install piston washers (18), springs (17), and
pistons (18) in cylinder block (15).
3. Install pump cylinder block assembly (15). Be
sure spring tension is even around the entire
block.
4. Install the two center section assembly pins
(43).
5. Install center section assembly (3) into main
housing (1). Make sure center section seats
fully on its mating surface.
6. Secure center assembly section (3) by in-
stalling three screws (44) reference Table 5,
Page 13. Apply a few drops of loctite on
screws when installing.
7. Install bypass plate (38) into center section
assembly (3).