Page 26 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

APPLY COMPONENTS

The Apply Components section is designed to explain The sequence in which the components in this section
the function of the hydraulic and mechanical holding have been discussed coincides with their physical
devices used in the Hydra-matic 6 Speed RWD arrangement inside the transmission. This order
transmission. Some of these apply components, such closely parallels the disassembly sequence used in
as clutches, are hydraulically “applied” and “released” the Hydra-matic 6 Speed RWD Unit Repair Section
in order to provide automatic gear range shifting. of the appropriate Service Manual. It also correlates
Other components, such as a sprag clutch, often react with the components shown on the Range Reference
to a hydraulically “applied” component by Charts that are used throughout the Power Flow
mechanically “holding” or “releasing” another member section of this book. The correlation of information
of the transmission. This interaction between the between the sections of this book helps the user
hydraulically and mechanically applied components more clearly understand the hydraulic and mechanical
is then explained in detail and supported with a graphic operating principles for this transmission.
illustration. In addition, this section shows the routing
of fluid pressure to the individual components and
their internal functions when it applies or releases.

MATING
OR
RELATED BRIEF
COMPONENTS DESCRIPTION

APPLY COMPONENTS - 4-5-6 CLUTCH APPLY COMPONENTS - 4-5-6 CLUTCH DAMPENER
plates. This disengages the 4-5-6 clutch plates (434), and clutch plate
assemblies (433), from the backing plate (432) and disconnects the 4-5-6
(w/turbine shaft) housing assembly (441) from the hub assembly (58), thus
the output carrier will not be driven at torque converter turbine speed.
➤
➤
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 piston to
counteract the centrifugal pressure forces created by the fluid within the
apply cavity. The compensator feed fluid assists the clutch return spring to
keep the piston in the released position when commanded off.
4-5-6 If the 4-5-6 clutch apply fluid does not completely exhaust from behind the 4-5-6
(W/TURBINE SHAFT) piston, there could be a partial apply, or drag, of the 4-5-6 clutch plates. If CLUTCH 4-5-6 4-5-6
CLUTCH (W/OUTPUT CARRIER SHAFT CLUTCH CLUTCH
ASSEMBLY the 4-5-6 clutch is inoperative, there will be no 4th, 5th or 6th gears available. AND DAMPENER) (W/OUTPUT CARRIER SHAFT) DAMPENER
(56) HUB HUB (476)
ASSEMBLY ASSEMBLY
4-5-6 CLUTCH: (58) (475)
The 4-5-6 clutch assembly is located in the 4-5-6 (w/turbine
shaft) housing assembly (441), which is splined to the torque 4-5-6 4-5-6 4-5-6 4-5-6 4-5-6
converter turbine assembly. The external teeth on the 4-5-6 (W/TURBINE SHAFT) CLUTCH CLUTCH CLUTCH CLUTCH
clutch plates (434) are splined to the 4-5-6 clutch housing HOUSING SPRING PISTON PLATE BACKING ➤
while the internal teeth on the 4-5-6 clutch plate assemblies ASSEMBLY (438) DAM (434) PLATE
(433) are splined to the 4-5-6 clutch (w/output carrier shaft (441) ASSEMBLY (432)
(437)
and dampener) hub assembly (58). The 4-5-6 clutch is 4-5-6 CLUTCH DAMPENER:
applied when the transmission is in 4th, 5th, or 6th gear The 4-5-6 clutch dampener (476) is located inside
ranges, to transfer engine torque to the output carrier the 4-5-6 clutch (w/output carrier shaft) hub
assembly (68). assembly (475). The dampener apply plate (477)
and the dampener retaining ring (478) are also
4-5-6 CLUTCH APPLY: housed in the hub assembly (475).
To apply the 4-5-6 clutch, 4-5-6 clutch COMPENSATOR 4-5-6
fluid is fed through the fluid pump FEED CLUTCH The 4-5-6 clutch dampener is designed to dissipate
cover (219), through the turbine FLUID PISTON or minimize unwanted clutch vibration as well as
DAM
shaft, and behind the piston RETAINING to eliminate or reduce the noise that may be
assembly (439). 4-5-6 clutch RING associated with it. A paper friction material is
fluid pressure moves the (436) bonded to both sides of the dampener, and contacts
piston to compress the the 4-5-6 clutch hub (475) and the dampener apply
spring (438). As fluid plate (477).
pressure increases, the
piston compresses the When the 4-5-6 clutch is applied or released, the
clutch plates until they are possible vibration and noise related to these actions
held against the backing are transferred to the dampener through the bonded
plate (432). Also included friction material. The vibration and noise is then 4-5-6
in the assembly is a 4-5-6 absorbed or dissipated by the dampener. The CLUTCH
clutch (waved) plate (435) that TURBINE dampener is in contact with lubrication fluid, but DAMPENER
APPLY
helps cushion the apply of the 4-5- SHAFT FLUID does not require any apply fluid force. RING
6 clutch. Behind the piston is a piston SEAL RING 4-5-6 (477)
dam assembly (437), which acts as the (442) CLUTCH
back side of the compensator fluid cavity. APPLY
When fully applied, the clutch plates (434), clutch FLUID Wear of the dampener friction material may
plate assemblies (433), and 4-5-6 clutch (waved) plate result in a vibration noise during a 4-5-6 clutch
(435) are locked together, thereby holding the housing assembly apply or release. 4-5-6
and the hub assembly (58) together. Since the output carrier BONDED CLUTCH
(490) is splined to the hub assembly, this forces the 4-5-6 clutch FRICTION DAMPENER
and the output carrier to rotate at the same speed as the torque 4-5-6 ➤ MATERIAL RETAINING
converter turbine assembly. RING
4-5-6 4-5-6 4-5-6 (478)
4-5-6 CLUTCH RELEASE: CLUTCH CLUTCH CLUTCH CLUTCH
PISTON
PLATE
To release the 4-5-6 clutch, 4-5-6 clutch fluid exhausts from the ASSEMBLY (WAVED) ASSEMBLY BACKING
PLATE
PLATE
piston, through the turbine shaft and into the fluid pump cover (439) (435) (433) RETAINING 475 476 477 478
(219). Spring force from the 4-5-6 clutch spring (438), and RING
compensator feed fluid, moves the piston away from the clutch (431)
442 441 439 438 437 436 435 434 433 432 431
➤
20 Figure 20 Figure 21 21
CUTAWAY DISASSEMBLED
VIEW VIEW
Figure 17 17