GMC S Series 1994, Руководство по ремонту

Страница: 865 / 919

DISASSEMBLY
EXTERNAL COMPONENTS
| Clean
The transfer case exterior using solvent and a stiff
brush.
Remove or Disconnect (Figures 1, 2, 3, and 4)
1. Front output yoke nut (77), washer (76), rubber
sealing washer (75), and front output yoke (74)
from the front output shaft.
2. Vacuum switch (46) and O-ring seal (47).
3. Poppet screw (68), poppet spring (71), and poppet
plunger (70).
M A IN SH A FT EXTENSIO N AND
O IL PUMP HOUSING
Remove or Disconnect (Figures 2, 3, and 4)
1. Rear extension bolts (3) and rear extension (4).
2. Bearing retainer snap ring (5) from the mainshaft
(19).
3. Pump retainer housing bolts (7).
4. Pump retainer housing (8) from the rear case half
(17).
5. Speedometer tone wheel (11) from the mainshaft
(19).
6. Case bolts (3) from the case halves.
• Note: The two longer case bolts and washers
go into the doweled case holes (33).
Important
Some transfer case models have a bracket attached
to them by the case half bolts. These bolts are different
from the others and must be put back into the correct
holes.
• Separate the case halves by inserting screwdrivers
into the slots cast into the case ends and pry apart.
Do not attempt to wedge the case halves apart at
any point on the mating surfaces. Damage to the
case may result.
• B e careful not to damage the oil pump (12)
(located in the rear case half) while removing
the rear case half (17).
INTER N AL COM PONENTS
+-► Remove or Disconnect (Figures 3 through 9)
Tools Required:
J 8092 Driver Handle
J 36370 Bearing Installer/Remover
J 29170 Bearing Remover
J 29369-1 Bearing Remover
J 9276-21 Adapter
J 2619-01 Slide Hammer
J 33790 Bearing Remover
The annulus gear found in this transfer case is not
serviceable or removable, and should only be replaced
as a unit with the front case half. If the annulus gear is
removed, damage will result to the case.
1. Oil pump (12) pickup tube (18), O-ring (14), and
pump pickup filter (35) from the rear case half (fig­
ure 5).
2. Fork shift spring.
3. Mainshaft (19), chain (58), and driven sprocket (22)
from the front case half (45) as a unit. Mode shift
fork (54) and shift rail (48) will be removed with the
mainshaft.
4. Retainer (snap ring) (83) from the mainshaft (19).
5. Synchronizer assembly (81).
6. Drive sprocket (20) from the mainshaft (19) (figure
6
).
7. Range shift fork (51) and range shift hub (34) from
the planetary carrier (36).
• It is necessary to rotate the sector shaft (55) to
obtain clearance when removing the range fork
(51) (figure 7).
8. Shift lever nut (63), washer (64), shift lever (65),
sector and shaft assembly (55), plastic washer
(66), and the O-ring seal (67) from the front case
half (45).
9. Input bearing retainer bolts (43) and input bearing
retainer (44) from the front case half (45).
10. Bearing retainer (snap ring) (39).
11. Planetary carrier (36) and the input gear (38) from
the annulus gear (62) using a soft faced hammer.
12. Input bearing (40) from the front case half (45)
using J 36370 and J 8092.
13. Drive sprocket bearings (82) from the drive sprock­
et (20) using J 29170 and J 8092.
14. Needle bearings (84) from the input gear (38) using
J 29369-1, J 9276-21 and J 2619-01 (figure 8).
15. Front output shaft seal (72) from the front case half
(45).
16. Front output bearing retainer ring (snap ring) (60).
17. Front output bearing (61) from the front case half
(45) using J 33790 and J 8092.
18. Seal (1) from the mainshaft extension housing (4).
19. Seal (42) from the input bearing retainer (44).
20. Front output rear bearing (24) from the rear case
half (17) using J 2619-01 and J 29369-2 (figure 9).
21. Mainshaft bearing (6) from the oil pump retainer (8)
using J 33790.
22. Magnets (25) from the front case half (45).
❖
Disassemble (Figures 3 and 4)
• Mark the location of the synchronizer hub and
sleeve to aid in assembly. Synchronizer teeth must
align with struts (30).
1. Main drive synchronizer stop ring (28) from the
synchronizer sleeve (29).