Transmission - TM-5-2410-233-340243

c. Inspection and Repair.

( 1 ) Inspect valve housing and valve for nicks,

burrs, pitting, a n d w e a r . E x a m i n e t h e v a l v e s e a t

and valve for damage and proper seating. If wear or

damage

replace

exists,

the

valve

complete

assembly.

( 2 ) Inspect the check valve spring for damage

a n d proper tension. T h e check valve spring should

e x e r t 5.750.50 pounds of force when compressed

to 2 . 0 0 i n c h e s . F r e e l e n g t h a f t e r t e s t s h o u l d b e

3 . 2 8 1 inches. Spring diameter is 0.50 inch. Replace

d e f e c t i v e or weak spring.

NOTE

6-9.

Transmission

a. General.

power s h i f t t r a n s m i s s i o n utilizes

(1)

The

p l a n e t a r y gearing and five hydraulically actuated

clutches to provide three forward and three reverse

speeds.

( 2 ) The five transmission clutches are of the

m u l t i p l e disc type, and are contained in separate

h o u s i n g s surrounding the ring gears of the trans-

m i s s i o n . The clutches have alternate discs (5, fig.

Figure 6-38. Clutch operation.

6-38) and plates (3). The discs (5) have internal

t e e t h which mesh with external teeth on the ring

g e a r (6). The plates (3) are notched to fit around

pins in the clutch housings which prevent the plates

from turning.

(3) The clutches are held disengaged by

s p r i n g s (2) which act between the clutch housing

(4) and piston (1). To engage the clutch, oil is

directed into the space behind the piston (1).

h y d r a u l i c pressure then moves the piston outward,

p r e s s i n g the plates (3) and discs (5) together and

preventing the ring gear (6) from turning.

( 4 ) The two front clutches (No. 1 and No. 2,

fig. 6 - 3 9 ) a r e d i r e c t i o n a l c l u t c h e s , d e t e r m i n i n g

forward or reverse direction, and the three rear

cluthes (No. 3. No. 4 and No.

5) are speed

clutches providing second, third and first speed

respectively.

( 5 ) Two clutches must be engaged in order to

transmit power through the transmission. The

Figure 6-39. Clutch designation.

f o l l o w i n g chart shows the combination of clutches

e n g a g e d for each forward or reverse speed.

Transmission

Reconditioning.

Speed

Clutches engaged

( 1 ) Before disassembling the transmission, all

d i r t and grease accumulations should be removed

1-5

First forward

from the exterior of the transmission case. The

1-3

Second forward

should be disassembled and

transmission

1-4

Third forward

2-5

a s s e m b l e d in clean surroundings with clean tools.

First reverse

2-3

Second reverse

D i r t or grit introduced into the transmission will

2-4

Third reverse

cause erratic operation and will shorten the service

l i f e of the transmission.

6-39