Transmission Main Oil Pressure Regulating Valve

TM 10-3930-242-34

Figure 4-4. Transmission forward and reverse drive assem-

bly, exploded view.

CAUTION

b. Removal. Refer to figure 4-6 and remove

Do not allow the converter-out tempera-

transmission main oil pressure regulating

valve.

ture to exceed 250F. Do not maintain a

full stall condition longer than 30 sec-

c . Disassembly. Refer to figure 4-7 and disas-

onds.

s e m b l e transmission main oil pressure regulat-

i n g valve in numerical sequence.

( 5 ) Increase the engine speed to full throt-

tle. Converter stall speed shown should be 2280

d. Cleaning and Inspection.

to 2310 engine rpm.

(1) Clean all parts thoroughly, using sol-

( 6 ) The only reading

significant to the stall

v e n t P-D-680, or equal.

test is engine speed. The

difference between es-

(2) Clean oil passages by working a piece of

tablished normal speed

and actual speed re-

w i r e back and forth through passages and flush

corded is significant only

if it varies 150 rpm.

w i t h cleaning solvent.

(3) Inspect bores for wear, grooves,

s c r a t c h e s , and dirt. Remove scratches and burrs

4-4. Transmission Main Oil Pressure Regulat-

w i t h crocus cloth.

ing Valve

( 4 ) Clean and inspect the gasket area. Re-

p l a c e a defective part.

a. General. The main pressure regulating

e. Reassembly. Refer to figure 4-7 and reas-

v a l v e is located on lower side of transmission

s e m b l e the transmission main oil pressure reg-

s e c u r e d to the torque converter housing and

u l a t i n g valve.

s u p p l i e s pressure to the control valve.