CHAP 2, SEC II
DESCRIPTION AND OPERATION OF
PAR 14-16
MAIN TRANSMISSION ASSEMBLY
( f i g . 3 7 7 , f o l d - o u t 6 ) i s s p l i n e d t o l o w-
range planetary shaft and carrier 27 (fig.
376, fold-out 5) which is supported by ball
bearing 20 (fig. 377, fold-out 6) in support
18.
c. Operation of Reverse-range
Clutch and Planetary Gearing
(fig. 377, fold-out 6)
( 1 ) W h e n h y d r a u l i c p r e s s u r e is
directed to the cavity between piston 60
(fig. 376, fold-out 5) and housing 55, the
piston moves against clutch plates 1, 2, 3,
a n d 5 ( f i g . 3 7 7 , f o l d - o u t 6 ) . T h i s c o m-
presses the plates against support 18 and
l o c k s t h e c l u t c h p l a t e s t o g e t h e r . R i ng
gear assembly 4 is thus prevented from
rotating and becomes the reaction mem-
ber of the planetary gear set.
(2) The reverse-range gearing is
c o m p o u n d e d w i t h t h e l o w - r a n g e g e a r i n g
to obtain the desired direction of rotation
and speed reduction. The reversing of ro-
tation occurs in the low-range gear set,
with some speed reduction. Further speed
r e d u c t i o n o c c u r s i n t h e r e v e r s e - r a n ge
g e a r i n g . T h i s i s b e c a u s e r e v e r s e - r a n ge
sun gear 39 (fig. 376, fold-out 5), being
the driving member of the reverse-range
gear set, must first be rotated. It is ro-
tated by low-range ring gear 38 to which
it is connected. In turn, low-range ring
g e a r 3 8 d e r i v e s i t s r o t a t i o n ( r e v e r s e d)
f r o m l o w - r a n g e p i n i o n s 3 0 w h i c h a re
driven by low-range sun gear 62 (fig. 375,
fold-out 4). The reaction member in the
low-range gear set under these conditions
is the moving carrier 27 (fig. 376, fold-out
5). Speed reduction is 4.77 to 1.
( 3 ) W h e n h y d r a u l i c p r e s s u r e is
released from the piston, springs 61 push
the piston into housing 55. This allows
the clutch plates to separate and rotate
freely, releasing the clutch.
15. OUTPUT TRANSFER GEARS
AND SHAFT
a . C o m p o n e n t s ( f i g s . 3 7 7 , 3 7 8 , 3 79
and 380, fold-outs 6, 7, 8 and 9). The out-
put transfer gearing includes a 50-tooth
output transfer drive gear 26 (fig. 377,
f o l d - o u t 6 ) , a 6 5 - t o o t h o u t p u t t r a n s f er
driven gear 49 (fig. 379, fold-out 8) and a
driven gear shaft 4 (fig. 380, fold-out 9).
The drive gear has internal splines which
engage the low-range planetary carrier
shaft. The driven gear has internal splines
w h i c h e n g a g e s h a f t 4 . B o t h g e a r s a re
supported by straight roller bearings 25
( f i g . 3 7 7 , f o l d - o u t 6 ) , 2 7 , 3 5 ( f i g . 3 7 8,
fold-out 7) and 1 (fig. 380, fold-out 9).
The bearings are retained by supports 24
( f i g . 3 7 7 , f o l d - o u t 6 ) , 2 8 , 3 4 ( f i g . 3 7 8,
f o l d - o u t 7 ) a n d 2 ( f i g . 3 8 0 , f o l d - o u t 9)
which are bolted to the transmission rear
housing.
b . Operation (figs. 377, 378, 379, 380,
fold-outs 6, 7, 8 and 9). Output transfer
drive gear 26 (fig. 377, fold-out 6) is ro-
tated clockwise (viewed from the left of
the transmission). Driven gear 49 (fig. 379,
fold-out 8) is meshed with drive gear 26
(fig. 377, fold-out 6) and rotates counter-
clockwise. This rotation is transmitted to
t h e g e a r e d s t e e r p l a n e t a r y r i n g g e a rs
splined to each end of shaft 4 (fig. 380,
fold-out 9). Thus the output of the range
gearing is reversed and transmitted to the
geared steer planetary gear sets at the
left and right of the transmission. The
s p e e d r e d u c t i o n i n t h e o u t p u t t r a n s f er
gearing is 1.3 to 1.
16. RIGHT- AND LEFT-GEARED STEER
PLANETARIES, OUTPUT CLUTCHES
AND STEER CLUTCHES
a. Geared Steer Planetary
Components (figs. 377, 378, 380
and 381, fold-outs 6, 7, 9 and 10)
Note.
A l l k e y n u m b e r s , b e l o w,
refer to figs. 377 and 378, fold-
outs 6 and 7, which illustrate the
left components. The right com-
ponents are identical and are illus-
trated in figs. 380 and 381, fold-
outs 9 and 10.
The geared steer planetary includes ring
gear 14 (fig. 378, fold-out 7), four pinions
6, sun gear assembly 52 (fig. 377, fold-out
6), four spindles 11 (fig. 378, fold-out 7)
and carrier 3. Ring gear 14 is splined to
driven gear shaft 4 (fig. 380, fold-out 9).
Pinions 6 (fig. 378, fold-out 7) rotate on
needle bearing rollers 7 on spindles 11
which are mounted in carrier 3. Sun gear
assembly 52 (fig. 377, fold-out 6) is splined
16 Change 2
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