PAR 13-14
DESCRIPTION AND OPERATION OF
CHAP 2, SEC II
MAIN TRANSMISSION ASSEMBLY
45, four external-tanged 46 plates, piston
50, springs 49 and retainer 48. Housing
55, in which piston 50 operates, serves
both the low- and reverse-range clutches.
Low-range planetary ring gear 38 serves
as the hub of the clutch.
(2) Clutch housing 44 is anchored
to the transmission housing by anchor bolt
43. External tangs on plates 46 engage
slots in housing 44. Internal splines on
plates 45 engage external splines on ring
gear 38. Piston housing 55 is anchored to
the transmission housing by bolt 42 (fig.
375, fold-out 4). Spring retainer 48 (fig.
376, fold-out 5) and springs 49 push the
piston into housing 55 when the clutch is
released.
b . Low-range Planetary Gearing
Components (fig. 376, fold-out 5)
(1) The low-range planetary gear-
ing includes a 60-tooth ring gear 38, four
20-tooth pinions 30, a 20-tooth sun gear 62
(fig. 375, fold-out 4), four spindles 34 (fig.
3 7 6 , f o l d - o u t 5 ) a n d s h a f t a n d c a r r i er
assembly 27. The pinions rotate on needle
bearing rollers 31 on the spindles mounted
in the carrier.
( 2 ) L o w - r a n g e r i n g g e a r 3 8 is
splined to intermediate-range carrier as-
sembly 16 and retained by retaining ring
15. Sun gear 62 (fig. 375, fold-out 4) is
splined to turbine shaft 2 and retained by
retaining ring 63. The transmission range
output shaft is an integral part of carrier
27 (fig. 376, fold-out 5). The carrier is
supported by reverse-range carrier assem-
bly 6 (fig. 377, fold-out 6) and the output
transfer drive gear.
c . Operation of Low-range Clutch
and Planetary Gearing (fig. 376,
fold-out 5)
( 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 50
and housing 55, the piston moves against
clutch plates 45 and 46. This compresses
the plates against clutch housing 44 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 38 is thus prevented from rotating
and becomes the reaction member of the
planetary gear set.
(2) Sun gear 62 (fig. 375, fold-out
4), driven by the turbine shaft, imparts
rotation to pinions 30 (fig. 376, fold-out
5). The pinions, in mesh with the internal
teeth of ring gear 38, are forced to rotate
within the stationary ring gear. This action
causes low-range planetary shaft and car-
r i e r 2 7 t o r o t a t e . T h e s p e e d r e d u c t i o n
ratio is 4 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 49 push
the piston into housing 55. This allows the
c l u t c h p l a t e s t o s e p a r a t e a n d r o t a t e
freely, releasing the clutch.
14. REVERSE-RANGE CLUTCH AND
PLANETARY GEARING
a . Reverse-range Clutch
Components (fig. 377, fold-out 6)
( 1 ) T he
reverse-range
clutch
includes support 18, four plates 1 and 3,
four plates 2 and 5, piston 60 (fig. 376,
fold-out 5), springs 61 and retainer 62.
These parts, except support 18 (fig. 377,
fold-out 6) are identical to the 10 low-range
clutch components. Housing 55 (fig. 376,
fold-out 5) serves the low- and reverse-
range clutches jointly.
(2) Support 18 (fig. 377, fold-out
6) is anchored, by integral lugs, in slots in
the rear transmission housing to prevent
rotation. Two screws 19 position it tem-
porarily during assembly. External splines
on ring gear assembly 4 serve as the clutch
hub.
b. Reverse-range Planetary Gearing
Components (fig. 377, fold-out 6)
( 1 ) T h e r e v e r s e - r a n g e p l a n e t a ry
g e a r i n g i n c l u d e s a 7 5 - t o o t h r i n g g e a r
assembly 4, six 18-tooth pinions 14, a 39-
tooth sun gear 39 (fig. 376, fold-out 5), six
spindles 7 (fig. 377, fold-out 6) and a car-
r i e r 1 7.
T h e p i n i o n s r o t a t e o n n e e d le
hearing rollers on the spindles which are
mounted in the carrier.
(2) Sun gear 39 (fig. 376, fold-out
5) is splined to low-range ring gear 38 and
retained by retaining ring 40. Carrier 17
Change 2 15
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