*C2
C H A P 2, SEC V
T O R Q U E P A T H S
P A R 4 0 - 4 3
4 0 . H Y D R A U L I C S Y S T E M F U N C T I O N -
DURING TOW OR PUSH STARTS
OF VEHICLE (fig. 19)
a. When it is necessary to start the ve-
hicle engine by towing or pushing the vehicle
(refer to TM 9-2300-216-10), the manual se-
l e c t o r v a l v e m u s t b e p l a c e d i n s e c o n d g e ar
p o s i t i o n.
b . T h e f u n c t i o n o f t h e h y d r a u l i c s y s t em
in second gear during a tow- or push -starting
o p e r a t i o n i s t h e s a m e a s t h a t d e s c r i b e d f or
second gear in par. 32, above, and illustrated
in fig. 8. However, during such an operation
(until the engine begins to rotate), the input
d r i v e n p r e s s u r e p u m p c a n n o t s u p p l y m a in
p r e s s u r e t o t h e s y s t e m . T h e o u t p u t d r i v en
p r e s s u r e p u m p m u s t s u p p l y m a i n p r e s s u re
until the clutches (output and low range) engage
and until torque is transmitted to the vehicle
engine.
c . T h e o u t p u t d r i v e n p r e s s u r e p u m p
draws oil, through the sump screen, from the
power train sump. The output of the oil pump
unseats a check valve and flows into the cavity
s u r r o u n d i n g t h e m a i n o i l s c r e e n a s s e m b l y.
Thereafter, the oil flow is the same as main
pressure oil flow for second gear under any
other condition.
d . The purpose of the check valve in the
output driven pressure pump output line is to
prevent a back flow of main pressure into the
o u t p u t d r i v e n p u m p . I n n e u t r a l , t h e o u t p ut
driven pump is not rotating and there is some
loss by leakage through the pump. In reverse
gears, the pump rotates in a reverse direc-
tion and would (except for the check valve)
a c t u a l l y p u m p o i l o u t o f t h e m a i n p r e s s u re
line and return it to the sump.
Section V. TORQUE PATHS THROUGH POWER TRAIN
4 1 . G E N E R AL
a . Figure 20 is a schematic view of the
power train without the output drive assem-
blies. All of the principal components through
which torque flows are identified. Figure 21
is a cutaway view of the left-output drive as-
sembly, colored to indicate the torque path.
Subsequent figures, 22 through 34, are colored
schematic views, illustrating the torque paths
for the conditions indicated in each view. Ar-
rows on components indicate the direction of
rotation of such components.
b . E x p l a n a t i o n s o f h y d r a u l i c a c t i o n s
u n d e r c o r r e s p o n d i n g c o n d i t i o n s a r e i n p a r s .
28 through 40 of this chapter.
c . T o a v o i d n e e d l e s s r e p e t i t i o n , r e f e r-
e n c e s a r e m a d e t o p r e c e d i n g e x p l a n a t i o ns
where applicable.
4
6
4 2 . T O R Q U E P A T H - I N P U T T R A N S F ER
GEARING (fig. 20)
Torque is transmitted from the engine to
the input transfer gearing by a splined coup-
l i n g s h a f t . T w o i d l e r g e a r s t r a n s m i t t o r q ue
from the input transfer drive gear to the con-
v e r t e r c o v e r d r i v e g e a r . T h e i n p u t r o t a t i on
(at coupling shaft) is counterclockwise when
viewed from the left side of the power train.
Rotation of the torque converter is clockwise,
T h e r e i s a s p e e d i n c r e a s e r a t i o o f 0 . 6 1 1 to
1.000 between the engine and torque converter.
43.
TORQUE PATHS - TORQUE
C O N V E R T E R A N D L O C K UP
CLUTCH (fig. 20)
a . Torque is transmitted from the input
transfer gearing to the range gearing by either
the torque converter or lockup clutch. When
the lockup clutch is released, torque is trans-
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