Input Pressure Pump

TM 9-2520-249-34&P

pressure and lubrication-pressure regulator valves, and

(5) When the oil strikes the front of the

oil filter housing. It encloses all of the transmission

stator vanes (at low turbine speeds), it drives the stator

internal components forward of the bevel drive gears.

in a direction opposite to converter rotation. This

causes the over-running clutch to engage and lock the

stator. However, when turbine speed approaches pump

2-4.

Converter Output Shaft

speed, the returning oil strikes the back of the stator

a. Description. Converter output shaft (39,

vanes.

This unlocks the stator and causes it to

FO-3) is a splined, steel shaft which connects the

freewheel, allowing the converter to act as a fluid

converter turbine to the range gearing. It extends from

coupling.

the converter turbine through high-range clutch housing

(6) When the converter reaches a

(2, FO-4) and the intermediate and low-range

predetermined speed and there is no further need for

components.

either torque multiplication or a fluid coupling, automatic

b. Operation.

The converter output shaft

valves direct the oil to activate the lockup clutch piston.

transmits torque from the converter turbine to high-

The piston compresses the lockup clutch disk against

range clutch housing (2, FO-4) and intermediate- and

the back plate, locking the converter turbine to the

low-range spur cluster sun gear (19).

All these

converter pump cover assembly Therefore, during

components are splined to the shaft A drilled passage

lockup operation, there is direct drive from the engine to

within the converter output shaft provides for lubrication

the converter turbine. The stator freewheels to prevent

of the low- and intermediate-range pinion bearings and

any hydraulic drag and there is no hydraulic slippage

drive bevel gear bearing. Another drilled passage

which is inherent in fluid drives without the lockup

directs charging oil to the lockup piston.

feature The result is economy in operation and

improved operating characteristics.

2-5.

High-Range Clutch

a. Description (FO-4)

2-2.

Input Pressure Pump

(1) The high-range clutch consists mainly

a. Description (FO-11).

Input oil pump

of clutch housing assembly (1), five external-tanged

assembly (2) is located at the lower front of the

disks (9), five internal-splined disks (10), clutch piston

transmission in an opening at the bottom of the

(7), and clutch back plate (11). Several minor parts,

converter housing. It is driven by a gear, concentric with

including springs, pins, and spring retainer (14),

the torque converter pump hub. The pump is a 2-gear

complete the assembly

positive displacement type. It consists mainly of an

(2) Clutch housing (2, FO-4) is splined to

external drive spur gear shaft (22), internal-drive and

the converter output shaft. Disks (9) engage pins (4)

idler gears (4 and 15), idler shaft (12), needle bearings

which cause the disks to rotate with the housing Internal-

(7, 14, 16 and 27), body (25), and cover (8)

splined disks (10) are positioned alternately between

b. Operation (FO-11). The pump supplies oil

external-tanged disks (9). The piston is fitted with oil

under pressure to charge the converter, activate valves,

seals and installed in a cavity in the clutch housing.

and lubricate the transmission. The input pump will be

Back plate (11) is the reaction member against which

in operation any time the vehicle engine is running. Oil

the clutch disks are compressed when the clutch is

is drawn from the transmission sump through oil suction

applied. The springs, compressed by retainer (14),

screen assembly (35), a passage in the converter

return the piston to its seat in the cavity when the clutch

housing, and into the pump through a passage in input

is released.

pump base (18). Oil is pumped out through another

b. Operation (FO-4)

passage in the pump base, a passage in the converter

(1) Torque is transmitted to clutch housing

housing, and into the oil filter housing cavity.

assembly (1) by the converter output shaft. When the

clutch is in the released position, the housing assembly,

2-3.

Torque Converter Housing

piston, external-tanged disks, and back plate rotate but

a. Description. Torque converter housing (60,

do not drive the internal-splined disks.

FO-3) is a magnesium casting which encloses the

(2) When the clutch is applied, hydraulic

torque converter, input pressure pump, and all forward

pressure pushes the piston rearward and compresses all

range gears. The front of the housing is flanged to bolt

ten disks against the back plate. This grips internal-

onto the engine flywheel housing The rear of the

splined disks (10, FO-4) and causes them to rotate with

housing is bolted to bevel gear housing (9, FO-5).

the housing. The splines on disks (10) are engaged with

b. Function. The torque converter housing

the high-range clutch hub splines which are integral

acts as the front mounting for the transmission within the

vehicle.

It provides mounting pads for the main

2-2