Selector Valve - TM-10-3930-644-14-P0093

TM 10-3930-644-14&P

Selector Valve

this check.

Add automatic transmission fluid, if

necessary, to bring the oil level up to the FULL mark on

Forward (F) position permits oil to flow to the forward

the dipstick. When so noted (every 1000 hours of

clutch and exhaust reverse clutch. Neutral (N) position

operation), the transmission sump should be drained

permits the selector valve to block oil at the valve and

and refilled with new oil.

exhaust both clutches. Reverse (R) position permits oil

to flow to reverse clutch and exhaust forward clutch.

CAUTION

DO NOT OVERFILL TRANSMISSION.

Converter Regulator Valve

No specific time intervals are given, but the shift control

Oil fed to converter from pressure regulator valve is

adjustment should be checked on occasion.

directed to end of converter regulator valve. Any time

force from oil on the end of the valve exceeds spring

The transmission operating pressures should be

force, the valve opens to feed oil to lube and clutch

checked whenever the unit is not operating efficiently or

cooling circuit.

after any internal parts have been replaced. Make

certain the oil cooler lines are tight. Refer to CHECK-

Clutch Orifice and Flyball

OUT PROCEDURES (TOPIC 2).

Clutch cylinders or pistons are provided with either bleed

Check and adjust the shifting mechanism if necessary.

holes or bleed holes and ball dump valve. These are

Refer to TOPIC 3.

provided to exhaust oil from the clutch cylinder and

assure clutch release. Centrifugal force could cause

Refer to TOPIC 4 for transmission oil cooler checks and

pressure buildup within the clutch cylinder if bleeds were

procedures.

not provided. The flyball bleed provides fast release and

permits higher apply pressure.

To service the oil filter refer to TOPIC 5. Change oil filter

every 200 hours.

B. SERVICE

At periodic inspections, make sure all mounting

At the truck lubrication period, open the trap door in the

capscrews are tight. Make certain no oil is leaking past

floor plate and check the oil level of the transmission

the output shaft and that the universal joints are tight.

sump by use of the dipstick. Engine must be running for

M-171-1

2-52