Page 27 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

APPLY COMPONENTS - 1-2-3-4 CLUTCH

disengages the 1-2-3-4 clutch plates (409), and clutch plate assemblies (408)
from the backing plate (407) and disconnects the housing assembly (427) from
1-2-3-4
AND the hub (61).
3-5
REVERSE The clutch apply cavity is kept full of fluid by the clutch exhaust backfill
CLUTCH circuit. Compensator feed fluid is fed into the cavity behind the piston to
HOUSING counteract the centrifugal pressure forces created by the fluid within the
ASSEMBLY apply cavity. The compensator feed fluid assists the clutch return spring to
(427) keep the piston in the released position when commanded off.
If the 1-2-3-4 apply fluid does not completely exhaust from behind the piston,
there could be a partial apply, or drag, of the 1-2-3-4 clutch plates. If the 1-2-3-4
clutch is inoperative, there will be no 1st, 2nd, 3rd or 4th gears available.
1-2-3-4
1-2-3-4 CLUTCH
1-2-3-4 CLUTCH PISTON
1-2-3-4 CLUTCH 1-2-3-4 PISTON DAM
(WAVED)
1-2-3-4 CLUTCH: CLUTCH PLATE CLUTCH DAM RETAINING
The 1-2-3-4 clutch assembly is located in the PISTON (410) SPRING ASSEMBLY RING
(414)
(412)
(413)
(411)
1-2-3-4 and 3-5 reverse clutch housing assembly
(427), and rides on the fluid pump cover hub. 1-2-3-4
The external teeth on the 1-2-3-4 clutch plates CLUTCH
(409) are splined to the housing assembly while PISTON
SEAL
the internal teeth on the 1-2-3-4 clutch plate (416)
assemblies (408) are splined to the 1-2-3-4
clutch hub (61). The 1-2-3-4 clutch is applied 1-2-3-4
when the transmission is in 1st, 2nd, 3rd, and CLUTCH
4th gears. PISTON
HOUSING
1-2-3-4 CLUTCH APPLY: RETAINING
To apply the 1-2-3-4 clutch, 1-2-3-4 clutch apply RING
fluid is fed through the fluid pump cover (219) (415)
and into the inner hub of the 1-2-3-4 and 3-5
reverse clutch housing assembly (427). Feed
holes in the inner hub allow 1-2-3-4 clutch apply
fluid to enter the housing between the 1-2-3-4
clutch piston (414) and the 1-2-3-4 clutch piston 1-2-3-4 COMPENSATOR
housing (417). 1-2-3-4 clutch fluid pressure CLUTCH FEED
APPLY
moves the piston to compress the 1-2-3-4 clutch FLUID FLUID
spring (413). As fluid pressure increases, the
piston compresses the clutch plates until they
are held against the 1-2-3-4 clutch backing plate
(407). Also included in the assembly is a 1-2-3-
4 clutch (waved) plate (410) that helps cushion 1-2-3-4
the apply of the 1-2-3-4 clutch. CLUTCH
PISTON
When fully applied, the 1-2-3-4 clutch plates HOUSING 1-2-3-4
SEAL
(409), clutch plate assemblies (408) and clutch (424) CLUTCH
(waved) plate (410) are locked together, thereby BACKING
holding the housing assembly (427) and the 1-2-3-4 PLATE
hub (61) together. This forces the hub to rotate CLUTCH (407)
at the same speed as the housing assembly (427). PISTON
HOUSING
1-2-3-4 CLUTCH RELEASE: SEAL
To release the 1-2-3-4 clutch, 1-2-3-4 clutch fluid (425)
exhausts from the piston, through the inner hub of 1-2-3-4
the housing assembly and into the fluid pump CLUTCH
cover (219). Spring force from the 1-2-3-4 clutch PISTON 1-2-3-4 1-2-3-4 1-2-3-4 1-2-3-4
spring (413), and compensator feed fluid moves INNER SEAL CLUTCH CLUTCH PLATE CLUTCH PLATE CLUTCH BACKING
(423)
the piston away from the clutch plates. This PISTON (409) ASSEMBLY PLATE RETAINING
HOUSING (408) RING
(417) (429)
425 424 423 417 416 415 414 413 412 411 410 409 408 407 429

18 Figure 18