TEST AND ADJUSTMENTS
CHAP 5, SEC XXXIV
- U s i n g a 9 / 1 6 - i n c h w r e n c h , r e-
move six cap screws 24 and lock washers
- R e m o v e s a d d l e c a p 2 8 . R e -
move coupling nut 80 (fig. 381, fold-out
10) and remove coupling retainer 79.
- D i s e n g a g e s h a f t 3 9 ( f i g . 3 8 6,
fold-out 15) by sliding it toward the out-
put drive assembly.
- Reinstall the retainer and nut.
Tighten the nut and install cap 28, wash-
ers 25 and cap screws 24. Tighten bolts to
( 2 ) D i s e n g a g e t h e l e f t - o u t p u t
drive assembly (fig. 385, fold-out 14). The
left-output assembly is disengaged in the
same manner as described for the right
side in (1), above.
b. Warm Up
( 1 ) C h e c k t h e t r a n s m i s s i o n o il
level (fig. 366). Add oil as required to ob-
tain the correct oil level for a safe start.
(2) Start the engine (or test stand
motor) and shift the transmission into 4th
g e a r . A p p l y t h e b r a k e s , a n d a l l o w t he
transmission to operate at an input speed
of 1200 to 1500 rpm for 3 to 8 minutes,
until normal operating temperature (ap-
proximately 220 degrees F) is reached.
( 3 ) S h i f t t h r o u g h a l l r a n g e s s e -
veral times to insure that the hydraulic
system is fully charged. Reduce the input
speed to make shifts from a forward range
to a reverse range, or from reverse range
to a forward range.
( 4 ) S h i f t t h e t r a n s m i s s i o n to
neutral range, apply the brakes, and in-
crease the input speed to 1200-1500 rpm
a n d m a i n t a i n f o r t h r e e m i n u t e s.
s t op
engine, wait twenty minutes, then check
the transmission oil level. Add or drain
the oil until oil level is at the top of the
O P E R A T I N G R A N G E m a r k i n g o n t he
indicator (fig. 366).
c . Leak Check. During the warm-up
period, inspect the transmission for oil
leaks at split lines and around bolts and
plugs. If leakage is present, check bolts
and plugs for tightness. If leakage con-
replace gaskets where required.
Leakage of oil, in many cases, can cause
faulty operation of the transmission.
d . Oil Pressures.
All necessary oil
p r e s s u r e t e s t s c a n b e m a d e d u r i n g t he
functional tests outlined in e , below, and
in fig. 367.
Fig. 368 illustrates and iden-
tifies the transmission oil pressure check
e. Functional Tests
(1) The test data log sheet (fig.
367) can be used as a guide for making the
proper tests, as well as providing spaces to
record actual tests results. In addition,
the normal pressures are included for com-
parison with test results.
(2) In all tests, the transmission
oil must be at normal operating tempera-
ture (approximately 220 degrees F). Con-
nect the pressure gage to the check point
indicated, for the test being made (fig.
transmission input to engine idle speed
before engaging the desired range. Then
slowly increase the speed to the desired
input speed. Record the readings for each
(4) Do not attempt to remove or
i n s t a l l g a g e s w h i l e t h e t r a n s m i s s i o n is
R e i n s t a l l p l u g s i m m e d i a t e ly
upon removing the gage.
( 5 ) W h e n m a k i n g t h e t e s t s f or
steer clutch pressure, move the steer con-
trol from Center to Full steer slowly while
observing the pressure rise. It should rise
to maximum as the control is moved fully
to steer position.
( 6 ) I n t e s t s f o r l o c k u p e n g a g e-
ment, increase speed slowly until lockup
apply pressure registers. Record lockup
pressure and input speed. Record gover-
nor pressure at lockup engagement (full
Change 2 197