GMC 1989 Light Duty Truck, Repair Manual, Page: 702 / 998

7A1-6 700-R4 AUTOMATIC TRANSMISSION
ILL.
NO.
DESCRIPTION
13 RING, SERVO COVER RETAINING
SEAL, " O ” RING (2 -4 SERVO COVER)
COVER, 2 -4 SERVO
PISTON, 4 T H APPLY
RING, OIL SEAL (4T H APPLY PISTON)
(OUTER)
RING, RETAINER (APPLY PIN)
W ASH ER , SERVO APPLY PIN
SPRING, SERVO APPLY PIN
SEAL, " 0 " RING
H O U S IN G , SERVO PISTON (INNER)
RING, OIL SEAL (2N D APPLY PISTON)
(INNER)
RING, OIL SEAL (2N D APPLY PISTON)
(OUTER)
PISTON, 2 N D APPLY
SPRING, SERVO C U SH IO N
RETAINER, SERVO C U SH IO N SPRING
RING, RETAINER (2N D APPLY PISTON)
PIN, 2N D APPLY PISTON
SPRING, SERVO RETURN
J H 0 0 5 8 -7 0 0 R 4
14
15
16
17
18
19
20
21
22
23
2 4
2 5
26
2 7
28
2 9
31
Figure 7 S e c o n d S ervo Piston Re tainin g Ring Removal
Figure 8 Ser vo Pin Length
Transmission End Play Check
A s a diagnostic aid transmission end play should
be checked prior to removing the internal parts. If the
end play is not within specifications you should watch
for possible worn or m isassembled parts during
disassembly.
Figure 6 Servo A s s e m b ly
Tighten (Figures 18 and 19)
TOOLS R E Q U IR E D :
J-24773-A Oil Pump Rem over
J-25022-A End Play Adaptor (245 mm )
J-34725 End Play Adaptor (298 mm)
J-25025-7A Post
D ial Indicator
R em ove an oil pump bolt (5) and install a 278 mm
(11 in.) bolt, and locknut or J-25025-7A.
J H 0 0 5 9 7 0 0 R 4
25 S E C O N D A P P L Y P I S T O N A S M .
2 -4 S E R V O P IN S E L E C T IO N
P IN L E N G T H P IN I.D .
mm
IN C H
2 R I N G S
3 R I N G S
W I D E B A N D
66.37-66.67
67.74-68.04
69.11-69.41
2.61-2.62
2.67-2.68
2.72-2.73
J H 0 0 6 0 7 0 0 R 4
PIN IS P R E S E T A T F A C T O R Y A N D M U S T N O T BE
R E A D J U S T E D
J 33037
A. W H I T E L I N E
B. G A G E S L O T