CHAP 1, SEC II
GENERAL DESCRIPTION AND DATA
Section II. GENERAL DESCRIPTION AND DATA
(3) Locational terms for the out-
put drive assemblies correspond to front,
a . General. The Allison Model XTG
rear, left and right of the vehicle.
411-2A and XTG 411-4 power trains (figs.
1 through 4) are each a combination of an
( 4 ) R o t a t i o n a l t e r m s ( c l o c k w i s e
input transfer (drive) section and a main
or counterclockwise) will be established
transmission section. Right- and left-out-
by references in text, or by the viewers
put drive assemblies are available and are
position in illustrations.
discussed in this publication. The input
transfer section includes a torque conver-
ter and transmits engine rotation to the
c . Transmission Component Groups.
main transmission section. The main trans-
The main components of the power train
mission section includes range clutches
a r e i d e n t i f i e d i n f i g s . 5 A , 5 B a n d 5 C.
and gearing, steer clutches, steer plane-
C h a p t e r 2 c o v e r s t h e d e s c r i p t i o n a nd
tary gearing and vehicle brakes. The out-
operation of all components in detail.
p u t d r i v e a s s e m b l i e s i n c l u d e r e d u c t i on
gear planetaries and provide reverse-rota-
t i n g d r i v e s t o t h e v e h i c l e t r a c k s . F o ur
5. DRIVING INSTRUCTIONS
forward and two reverse speeds are man-
u a l l y s e l e c t e d . T h e a x e s o f t h e e n g i n e,
Refer to the vehicle operator manual
main transmission and output drives are
b . Definition of Locational and
(1) Locational terms used in de-
scribing the power train, are front, rear,
right and left. The input transfer section
and main transmission section locational
terms do not always correspond to vehicle
locational terms, while those of the output
d r i v e a s s e m b l i e s d o c o r r e s p o n d . I n t he
vehicle application for which this manual
i s w r i t t e n , t h e p o w e r t r a i n i s f r o n t -
mounted and the locational terms for the
input transfer and main transmission sec-
tions are opposite those for the vehicle
and output drive assemblies (fig. 3).
(2) The front of the transmission
is always the location adjacent to the en-
gine regardless of the manner of mounting
in the vehicle. The rear is the location at
w h i c h t h e b r a k e i n s p e c t i o n c o v e r s a re
mounted. The left is the side to which
the input transfer housing is attached.
The right is the side on which the brake
apply shafts are located (figs. 2 and 3).
Oil may be considered as the lifeblood
of a hydraulic transmission. The use of
proper oil, and attention to keeping the
o i l c l e a n , i s o f p a r a m o u n t i m p o r t a n c e.
The proper oil level must be maintained in
the transmission to obtain maximum per-
formance. Check the oil level regularly.
Clean the oil screens at specified inter-
B e v e r y c a r e f u l t h a t n o f o r e i gn
matter enters the power train system at
any time. When changing or adding oil,
use only that specified (see Oil specifi-
c a t i o n s T a b l e I , T A B U L A T E D D A T A,
p a r . 7 , b e l o w ).
R e f e r t o t h e o p e r a t or
manual for procedures to be followed in
checking the oil level and for changing
The following table covers technical
data applicable to the Allison XTG 411-2A
and XTG 411-4 power trains.
C h a n g e 2