Isuzu N-Series. Service manual — part 879
7B1-40 MANUAL TRANSMISSION (MZZ)
40. Install the 6th gear. The projecting portion of the
gear must be facing down.
N7A1222E
MANUAL TRANSMISSION (MZZ) 7B1-41
Countershaft
Parts
Disassembly
1. Use a pair of snap ring pliers to remove the snap
ring holding the bearings in place.
2. Use a bearing separator or the like to remove the
bearing from the front of the countershaft.
Caution:
Replace the bearing with inner race and outer race to
new one.
3. Use a bearing remover and a press to remove the
collar and the thrust washer.
4. Use a bearing separator or the like to remove the
bearing from the rear of the countershaft.
Caution:
Replace the bearing with inner race and outer race to
new one.
5. Inspect the disassembled parts for wear and/or
other damage. Repair or replace damaged parts as
required.
6. Check the cross-sectional area of each gear for
significant wear and/or damage. If wear of damage
is present, the gear must be replaced.
7. Inspect each of the bearings for roughness, abnor-
mal operating noise, corrosion, internal and exter-
nal damage, and excessive play (in the direction of
the slide). Repair or replace the bearings as re-
quired.
Reassembly
1. Use the installer (5-8840-2244-0) and a press to
force the rear countershaft bearing into place.
Legend
1. Snap ring
4. Bearing (Back of countershaft)
2. Bearing (Front of countershaft)
5. Thrust washer
3. Countershaft assembly
6. Collar
N7A1257E
N7A1259E
7B1-42 MANUAL TRANSMISSION (MZZ)
2. Use the installer (5-8840-2244-0) and a press to
force the collar and thrust washer into place.
3. Use the installer (5-8840-2244-0) and a press to
force the bearing on to the front of the countershaft.
4. Use a pair of snap ring pliers to install the snap ring
securing the front countershaft bearing.
• From the mountable snap rings, select the thickest
one of the three types.
N7A1255E
N7A1262E
Shim thickness mm (in)
Discernment color
1.9 (0.075)
Colorless
2.1 (0.083)
Yellow
2.3 (0.091)
Pink
N7A1256E
MANUAL TRANSMISSION (MZZ) 7B1-43
Control Box
Parts
Legend
1. Shift lever shaft
11. Selector internal lever
2. Shift lever shaft oil seal
12. Spring pin (Selector internal lever)
3. Spring
13. Stopper ring
4. Washer
14. Spring pin (Stopper ring)
5. Shift internal lever
15. Spring pin (Shift lever shaft)
6. Spring seat
16. Neutral switch
7. Spring
17. Selector lever shaft oil seal
8. Pipe
18. Washer
9. Control box
19. Selector external lever
10. Detent
1
2
3
4
5
6
7
8
9
10
11
13
12
14
15
16
17
18
19
N7A0406E
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