Section III. TRANSMISSION AND TORQUE CONVERTER

TM 10-3930-630-34

NOTE

12-7.

Transmission Control Valve, Cleaning,

Check all plungers and spools to be

Inspection and Repair

a. Wash all metal parts in cleaning solvent, (Fed.

certain they operate freely.

Spec. P-D-680) and dry with compressed air.

certain the inching control plunger

b. Blow out all passages in the valve body with

stop is installed with the angled

compressed air.

edges facing toward the rear of the

c. Check plungers and spools for scratches or

valve body.

scoring, clean with crocus cloth. If severely damaged,

b. Installation.

replace.

(1) Remove covering from transmission and

d. Check springs for cracks, breaks or other

install a new gasket.

damage. Replace if necessary.

(2) Refer to figure 12-4 and position control

e. Replace all gaskets, seal rings, and oil seals at

valve on transmission and secure with mounting screws.

reassembly.

Torque screws to 5 to 10 foot-pounds (6.7 to 13.5 N-m).

(3) Remove cap from tube assembly and

12-8.

Transmission Control Valve, Reas-

connect assembly to the control valve.

sembly and Installation

(4) Reconnect control linkage to control valve.

(5) Refer to paragraph 12-12b for test and

a. Reassembly. Reassemble transmission control

adjustments, if necessary.

valve in reverse numerical sequence as illustrated in

(6) Refer to TM 10-3930-630-12 and install

figure 12-5.

floor and toe plates.

Section III.

TRANSMISSION AND TORQUE CONVERTER

12-9.

General

(4) Remove tube assembly (1, fig. 12-7) and

elbow (2). Remove oil level gage (68) and plugs (64,

a. Power from the engine is delivered to the torque

65, 66 and 67). Remove pipe plug (61) and remove

converter which, in turn, drives a pump and clutch pack.

spring (62) and screen (63). Remove seat (16), washer

Housed in the clutch drum are two double faced clutch

(17), spring (18), and ball (19) from converter housing.

plates which, when activated, move the truck forward or

in reverse through splined hubs transmitting power to

the gear train.

b. If the reverse clutch is activated, power is

delivered to the transmission through a hollow shaft

which connects the reverse gear and reverse clutch. If

the forward clutch is actuated, power is delivered to the

transmission through a solid shaft, which rotates inside

the hollow reverse shaft connecting the forward gear

and forward clutch.

12-10. Transmission and Torque Converter,

Removal and Disassembly

a. Removal. Refer to paragraph 2-25 and remove

the transmission.

b. Disassembly.

(1) Clean the exterior of transmission with

cleaning solvent, (Fed. Spec. P-D-680) to prevent

system contamination.

(2) Refer to paragraph 12-6 and remove the

transmission control valve.

(3) Refer to figure 12-6 and mark oil pump

assembly and housing to insure proper reassembly.

Remove mounting screws holding oil pump assembly to

converter housing. If necessary, tap pump assembly

with a rawhide hammer to free it from the gasket.

Figure 12-6. Transmission oil pump, removal and installation.

12-6