GMC 1989 Light Duty Truck, Repair Manual, Page: 725 / 998

700-R4 AUTOMATIC TRANSMISSION 7A1-29
Figure 61 V ie w s o f th e In p u t H ousing
A S H A F T ,T U R B IN E
618 S EA L, " O " RING (T U R B IN E S H A F T /
S E LE C TIV E W ASHER)
621 HOUSING & S H A F T
ASSEMBLY, INPUT
J H 0 1 0 9 -7 0 0 R 4
USED WITH
245 MM CONVERTER
USED W ITH
298 MM C O N VERTER
• Overrun spring assembly (634) for damage or
distortion
• Input housing to output shaft lip seal (636) for
damage or wear
*
2. Inner and outer 3-4 clutch lip seals (624) on the
3-4 clutch piston
seal lips must face away from the piston
hub.
lubricate the seals with transmission fluid.
3. The 3-4 clutch piston (623) into the input housing
as shown
use care not to damage the seals.
623 PISTON, 3RD & 4TH CLUTCH
624 SEALS, 3RD & 4 T H C LUTCH (IN N E R & OUTER)
JH 0 1 1 1 -7 0 0 R 4
L9
Figure 6 2 In p u t H ousing and 3-4 Piston
Inspect (Figures 57, 63, 65)
Forward clutch housing (628) for
proper check ball operation
damage or distortion
burrs in seal areas
cracks
Forward clutch piston (630) and overrun clutch
piston (632) for
porosity or damage
ring groove damage
apply leg damage
2 .
3.
4.
6 .
7.
*
1.
2
.
3.
4.
L9
Assemble (Figures 63 and 64)
TOOLS R E Q U IR E D :
J-23456 Clutch Spring Compressor Press
J-23327-1 Clutch Spring Compressor
J-25018-A Clutch Spring Compressor
Adaptor
J-29882 Overrun Clutch Inner Seal
Protector
J-29883 Forward Clutch Inner Seal
Protector
Forward clutch housing to input clutch housing
“O ” ring seal (622) as shown
lubricate with transmission fluid.
Inner and outer seals (629) on forward clutch
piston
seal lips must face away from the piston
tangs as shown.
lubricate with transmission fluid.
Forward clutch piston (630) into the forward
clutch housing
use care not to damage the outer lip seal.
The 3-4 clutch spring assembly (626) onto the 3-4
clutch apply ring
Forward clutch assembly onto the 3-4 clutch
spring assembly
the forward clutch piston apply legs must be
indexed with the 3-4 clutch apply ring legs.
J-29883 on the input housing as shown
A pply ring and forward clutch assembly into the
input housing as shown
hold the assembly by the apply ring legs
during installation.
do not let the forward clutch piston separate
from the housing,
firmly seat the assembly.
J-29882 on the input housing as shown
Overrun clutch piston (632)
hub facing upward as shown,
if all parts are properly seated to this point,
the overrun piston hub will be
approximately 4.7 mm (3 /1 6 in.) below the
snap ring groove in the input housing hub.
Assemble (Figures 65 and 66)
Overrun clutch spring assembly (634) onto the
overrun clutch piston.
locate the springs on the piston tabs
J-23456 and J-23327-1 with J-25018-A onto the
overrun spring assembly.
com press springs (D o not over-com press).
Retainer snap ring (635) into the snap ring groove
Input housing to output shaft lip seal (636)
Inspect
• Overrun clutch plates (645)