TOPIC 3. DRUM ASSEMBLY

TM 10-3930-644-14&P

TOPIC 3. DRUM ASSEMBLY

The drum assembly is comprised of a drum, the forward

stator support to converter housing. It may be

and reverse clutches, pistons and cylinders.

The

necessary to tap the pump assembly with a

clutches are engaged by oil pressure applied behind the

rawhide hammer to free it from the gasket. (See

pistons which causes engagement with the drum. The

Figure 1-4.)

unit operates in oil at all times, both for cooling and

lubrication.

4. Lay the transmission on the gear case side as

shown in Figure 1-5. Remove the capscrews

It is necessary to remove the transmission in order to

which mount the converter housing to the gear

gain access to the drum assembly for service or repair.

case. Then attach a chain to the housing and

(Refer

TRANSMISSION

REMOVAL

and

remove the housing and drum assembly as a

DISASSEMBLY

unit, taking care not to damage the seal rings in

collector ring on gear case (Figure 1-5).

A. REMOVAL

To remove the converter housing from the drum,

1. Thoroughly clean outside of transmission to

remove the snap ring on the turbine shaft and

prevent possibility of contamination.

slide the housing from the drum assembly. The

bearing will remain in housing. (See Figure 1-6.)

2. With transmission out of truck, remove the

capscrews from valve assembly and remove

B. DISASSEMBLY

valve assembly.

Remove valve to prevent

damage

valve

during

disassembly

The front and rear clutch assemblies are balanced. Two

procedures.

lines are etched on rear clutch cylinder to indicate

correct alignment of the cylinder with the piston. One

3. Slide converter off the turbine shaft. Then mark

etched line is

the pump and the housing to ensure the proper

reinstallation, and remove capscrews holding

the pump and

Figure 3-1. Drum Assembly

R-171-1

3-127