Page 28 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

APPLY COMPONENTS - 3-5 REVERSE CLUTCH

The clutch apply cavity is kept full of fluid by the clutch exhaust
backfill circuit. Compensator feed fluid is fed into the cavity behind the
1-2-3-4
AND piston to counteract the centrifugal pressure forces created by the fluid
3-5 within the apply cavity. The compensator feed fluid assists the clutch
REVERSE return spring to keep the piston in the released position when commanded
CLUTCH off.
HOUSING
ASSEMBLY
(427) If the 3-5 reverse clutch apply fluid does not completely exhaust from behind
the piston, there could be a partial apply, or drag, of the 3-5 reverse clutch. If
the 3-5 reverse clutch is inoperative, there will be no 3rd, 5th, or reverse
gears available.

3-5 3-5 3-5 3-5 3-5
REVERSE REVERSE REVERSE REVERSE REVERSE
CLUTCH CLUTCH CLUTCH CLUTCH CLUTCH
3-5 REVERSE CLUTCH: PISTON SPRING PLATE PLATE BACKING
The 3-5 reverse clutch assembly is located in the 3-5 OUTER (420) (403) ASSEMBLY PLATE
1-2-3-4 and 3-5 reverse clutch housing assembly REVERSE SEAL (402) (401)
(427). The external teeth on the 3-5 reverse clutch CLUTCH (422)
plates (403) are splined to the housing assembly PISTON
(421)
while the internal teeth on the 3-5 reverse clutch
plate assemblies (402) are splined to the 2-6 and
3-5 reverse clutch hub assembly (64). The 3-5
reverse clutch is applied when the transmission is
in 3rd, 5th or reverse gear.
3-5 REVERSE CLUTCH APPLY:
To apply the 3-5 reverse clutch, 3-5 reverse clutch
apply fluid is fed through the fluid pump cover
(219) and behind the 3-5 reverse clutch piston
(421). 3-5 reverse clutch fluid pressure forces the
piston against the 3-5 reverse clutch apply ring
(405) and the 3-5 reverse clutch spring (420).
As fluid pressure increases, the piston
compresses the clutch plates together 3-5
until they are held against the 3-5 reverse COMPENSATOR REVERSE
clutch backing plate (401). Also included FEED CLUTCH
in the assembly is a 3-5 reverse clutch FLUID APPLY
(waved) plate (404) that helps cushion FLUID
the apply of the 3-5 reverse clutch.
3-5
When fully applied, the 3-5 reverse clutch plates REVERSE
(403), clutch plate assemblies (402) and clutch CLUTCH
(waved) plate (404) are locked together, thereby BACKING
holding the housing assembly (427) and the hub PLATE
(64) together. This forces the hub to rotate at the RETAINING
same speed as the housing assembly (427). RING
(400)
3-5 REVERSE CLUTCH RELEASE:
To release the 3-5 reverse clutch, 3-5 reverse clutch
apply fluid exhausts through the 3-5 reverse clutch
apply fluid circuit, allowing pressure at the 3-5 reverse
clutch piston (421) to decrease. Spring force from 3-5
the 3-5 reverse clutch spring (420), and compensator REVERSE
feed fluid move the 3-5 reverse clutch apply ring CLUTCH PISTON
(405) away from the clutch pack. This disengages INNER 3-5 3-5 3-5
SEAL
the 3-5 reverse clutch plates (403), clutch plate (419) REVERSE REVERSE REVERSE
assemblies (402) from the backing plate (401) and CLUTCH PISTON CLUTCH APPLY CLUTCH (WAVED)
disconnects the housing assembly (427) from the DAM SEAL RING PLATE
hub (64). (418) (405) (404)

422 421 418 419 420 405 404 403 402 401 400

Figure 19 19