This section contains maintenance data for the trans-
a. General. The control valve consists of a valve
mission assembly including the control valve, front
body with two selector valve spools. A ball detent in
cover and input shaft, rear cover, output shaft and dis-
the selector spool provides three positions, one each
connect assembly, transmission case, parking brake,
for forward, neutral, and reverse. The control valve is
and the four clutches. The transmission is a separate
located on the left side of the transmission housing as
and distinct unit from the torque converter assembly.
shown in figure 4-29.
It is connected by a propeller shaft to the torque con-
verter assembly. Two propeller shafts couple the trans-
mission to the axles to drive the forklift truck. The
(1) Disconnect control valve linkage (TM 10-
torque converter and transmission operate through a
common hydraulic system.
(2) Remove nine screws and washers and carefully
lift off control valve assembly as shown in figure 4-29.
Use caution as the detent springs and balls
may fall out when removing the control
(3) Remove two detent springs (3, fig 4-30), de-
tent balls (4) and gasket (5).
(1) Remove pressure switch (5, fig. 4-30) and ball
(2) Remove inching valve (7) from control valve
assembly and remove packing (8). Remove spool (9),
packing (10), oil seal (11), and plug (12) from inching
(3) Remove nut (13) from inching piston (14).
Remove washer (15), spacer (16), spring (17), and
release valve (18) from inching piston.
(4) Remove spring (19) and spacer (20) from con-
trol valve assembly.
(5) Remove plug (21) and packing (22) from con-
trol valve assembly (33).
(6) Remove seal (23), retaining ring (24), washer
(25), and valve spool (26) from control valve assembly.
(7) Remove seal (27), retaining ring (28), washer
(29), overshift spacer (30), and valve spool (31).
Remove pipe plug (32) from valve spool.
d. Cleaning. Clean all metal parts with cleaning sol-
vent P-D-680. Dry cleaned parts thoroughly.
e. Inspection and Repair.
(1) Inspect valve body for cracks or excessive wear
in spool bores. Replace if defective.
(2) Inspect spools for excessive wear, bent, or
broken condition. Replace if defective.
(3) Discard all seals and preformed packings.
(4) Inspect detent balls for flat or out of round
condition which would not allow proper seating.
Replace defective balls.
(5) Inspect seats in the valve body for cracks or
excessive wear. Replace the valve body if the seats are