Page 33 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

APPLY COMPONENTS - LOW CLUTCH SPRAG

greater than the distance between the inner and outer race, causing
the sprags to “lock” against the low clutch sprag outer race (A).
LOW
CLUTCH LOW CLUTCH SPRAG RELEASED:
SPRAG The low clutch sprag releases when the sprags pivot toward
ASSEMBLY their short diagonals. The length of the short diagonals (2) is
(467)
less than the distance between the inner and outer race, allowing
the outer race to overrun the sprags.
A damaged low clutch sprag can cause no 1st gear (unless low
and reverse clutch is applied).
A bound up sprag can cause tie up in 2nd, 3rd, 4th, 5th and 6th
LOW CLUTCH SPRAG: gears,
The low clutch sprag assembly (467) is located between the low
and reverse clutch assembly and the center support hub. The LOW LOW LOW
inner race (B) of the sprag assembly is splined to the center CLUTCH CLUTCH CLUTCH
SPRAG
support, and the outer race (A) is splined to the internal teeth of SPRAG SPRAG RETAINING
OUTER
the low and reverse clutch plate assemblies (463), and to the ASSEMBLY RACE RING
(D)
output carrier assembly (68). The low clutch sprag is a type of (A) (G)
one-way clutch that prevents the output carrier assembly (68)
from rotating in the direction opposite of engine rotation. The
low clutch sprag is holding when the transmission is in 1st gear
and 1st gear braking. However, when the throttle is released in
1st gear, the low clutch sprag will overrun and allow the vehicle
to coast, until engine braking is required.
LOW CLUTCH SPRAG HOLDING:
In first gear, power flow attempts to drive the output carrier in the
direction opposite of engine rotation and pivots the sprags toward
their long diagonals. The length of the long diagonals (1) is

CLUTCH SPRAG HOLDING OUTER RACE

HELD
1

STATIONARY LOW
CLUTCH
LOW SPRAG
CLUTCH OUTER
SPRAG RACE
INNER (A)
RACE
(B)
SPRAG IS VIEWED FROM THIS DIRECTION
OUTER RACE OVERRUNNING CLUTCH SPRAG

2

STATIONARY LOW
LOW LOW LOW
CLUTCH CLUTCH CLUTCH CLUTCH
LOW SPRAG SPRAG SPRAG
CLUTCH SPRAG INNER END RETAINER
OUTER
SPRAG RACE RACE BEARING PLATE
INNER (A) (B) (C) (F)
RACE OVERRUNNING
(B)
A
B C D C F G

24 Figure 24