Isuzu N-Series. Service manual — part 959
7B-72 Automatic Transmission (Smoother)
22. Use snap ring pliers to remove the 6th clutch hub
snap ring.
23. Use a puller to remove the 6th clutch hub assembly
and sleeve, 6th block ring, 6th gear, and needle
bearing from the counter shaft.
24. Disassemble the 6th clutch hub assembly and
sleeve.
a. Remove the stopper plate from the clutch hub.
• The arrow indicates the front of the
transmission.
Caution:
If you remove the stopper plate, replace it with a new
plate when re-installing.
b. Disassemble the clutch hub assembly and
sleeve.
25. Remove the speedometer gear.
• Remove the collar.
26. Remove the retainer from the transmission case.
27. Pull out the reverse idle shaft, and remove the
reverse idle gear and needle bearing.
N7A1140E
N7A1141E
Legend
1. Spring
2. Insert Key
3. Clutch Hub
4. Sleeve
N7A1142E
N7A1143E
Automatic Transmission (Smoother) 7B-73
28. Remove the rear outer snap ring from the main
shaft rear bearing.
29. Remover the counter shim.
30. Remove the 4th — 5th and 6th shift rod snap rings.
31. Remove the transmission case from the clutch
housing.
32. Remove the bearing rear outer race from the
transmission case.
33. Remove the 4th — 5th and 6th shift rod, 1st —
Reverse and 6th shift block, 4th — and 5th shift
arm.
• When driving out the spring pin, insert a round
bar on the opposite side of the shift rod, and
use a spring pin remover to remove the spring
pin while taking care to avoid damage to other
parts.
34. Remove the 1st — Reverse and 2nd — 3rd shift
rod, 1st — Reverse shift arm, 3rd — 2nd shift arm,
1st — and Reverse and 6th shift block.
• When driving out the spring pin, insert a round
bar on the opposite side of the shift rod, and
use a spring pin remover to remove the spring
pin while taking care to avoid damage to other
parts.
N7A1090E
N7A1145E
N7A0316E
N7A1147E
7B-74 Automatic Transmission (Smoother)
35. Use a remover (5-8840-2755-0) to remove the
bushing from the 4th — 5th shift arm.
36. Use a remover (5-8840-2755-0) to remove the
busing from the 3rd — 2nd shift arm.
• Use the remover in combination with a round
bar of a length that makes it possible to push in
as far as possible.
37. Remove the magnet from the clutch housing.
38. Remove the main shaft assembly, top gear shaft
assembly, and counter shaft assembly.
a. Use a lashing belt or some other belt from a
lashing device to bundle the main shaft
assembly, counter shaft assembly, and top
gear shaft assembly at two points so they
cannot separate. Tighten the belt securely.
b. Attach a bearing remover to the main shaft and
secure with a lock nut. Then attach a wire and
raise it using a hoist. While opening the top
gear shaft bearing outer snap ring attached to
the clutching housing, simultaneously remove
the top gear shaft assembly, main shaft
assembly, and counter shaft assembly from the
clutch housing.
N7A1148E
N7A1094E
N7A1095E
N7A1096E
Automatic Transmission (Smoother) 7B-75
39. Inspect the clutch housing bushing. If it is worn or
damaged, use pliers to remove it from the clutch
housing.
40. Inspect the counter shaft front bearing. If it is worn
or damaged, use a bearing remover (5-8840-2757-
0) and bushing puller (5-8840-2802-0) to remove
the bearing outer race from the clutch housing.
41. Inspect the front oil seal. If it is worn or damaged,
remove it from the clutch housing cover.
Inspect each part. Replace or repair as required if
anything is worn or damaged or if any other defect
is discovered.
42. Inspect each shift mechanism component. Repair
any minor damage, bending, or stepped wear.
Replace any component that is badly damaged or
worn, and any component that exceeds the
allowable limit.
• Shift rod and shift arm bending, wear, damage
• Shift arm thickness
– Use a micrometer to measure the thickness
of the shift arm tip.
N7A1097E
N7A1098E
Shift Arm Thickness (mm)
Specified Value
Limit
1st — Reverse
3rd — 2nd
5th — 4th
9.60 — 9.85
9.00
6th
9.60 — 9.85
9.30
N7A1099E
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