Isuzu N-Series. Manual — part 880
7B1-44 MANUAL TRANSMISSION (MZZ)
Disassembly
1. Remove the neutral switch (1), the detent (2).
2. Use a spring pin remover to remove the selector in-
ternal bar spring pin (4).
3. Remove the selector internal lever (3), the selector
external bar (1), and the washer (2).
4. Use a pair of pliers to remove the stopper ring
spring pin (8) and the shift lever shaft spring pin (9).
5. Pull the shift lever shaft (1) from the assembly.
6. Remove the stopper ring (7), the spring (6), the
spring seat (5), the shift internal lever (4), the
washer (3), and the spring (2).
7. Use a screwdriver or similar prying tool to remove
the selector lever shaft oil seal and the shift lever
shaft oil seal from the control box.
8. Inspect the disassembled parts for wear and/or
damage. Make the necessary repairs or replace
the part as appropriate.
9. Inspect the shift lever shaft for significant wear. Re-
place the shaft if significant wear is present.
10. Inspect the control box for excessive play and
rough or restricted movement. Replace the control
box if either of these conditions is present.
2
1
N7A0407E
N7A0408E
3
4
2
1
N7A0409E
1
8
9
2
3
4
5
6
7
N7A0410E
MANUAL TRANSMISSION (MZZ) 7B1-45
Reassembly
1. Use the installer (5-8840-2245-0) to install the shift
lever shaft oil seal and the selector lever shaft oil
seal to the control box.
2. Install the spring (2), the washer (3), the shift inter-
nal lever (4), the spring seat (5), the spring (6), and
the stopper ring (7) to the control box.
3. Insert the shift lever shaft (1).
4. Align the pin holes in the shift lever shaft and the
stopper ring.
5. Drive the new stopper ring spring pin (8) and the
new shift lever shaft spring pin (9) into place.
6. Install the selector external lever (1) and the wash-
er (2) to the control box.
7. Install the selector internal lever (3).
8. Drive the new selector internal lever spring pin (4)
into place.
9. Install the detent (2).
Tighten:
Detent (2) to 28 N
⋅m (2.9 kg⋅m / 21 lb⋅ft)
• Detents are precoated. Be sure to thoroughly re-
move sealing material around the threads of the
case, and use new detents.
10. Tighten the neutral switch (1) to the specified
torque.
• Thoroughly remove sealing material from the
threads, apply Three Bond 1141 to them, and then
assemble.
Tighten:
Neutral switch (1) to 34 N
⋅m (3.5 kg⋅m / 25 lb⋅ft)
5-8840-2245-0
N7A0411E
1
8
9
2
3
4
5
6
7
N7A0410E
3
4
2
1
N7A0409E
2
1
N7A0407E
7B1-46 MANUAL TRANSMISSION (MZZ)
SPECIFICATIONS
Specifications
Fixing Torque
Transmission Type
MZZ6U Direct Drive 6-Speed
Gear Mesh Type
1st, 2nd, 3rd, Reverse: Synchro-mesh
Gear Ratio
1st 6.389
2nd 3.767
3rd 2.234
4th 1.442
5th 1.000
6th 0.782
Reverse 6.369
Lubricating Oil
Engine Oil SAE 5W-30
Oil Capacity
Approx. 4.4 Liters (4.7 US qt/3.9 Imp qt)
Weight without Lubricating Oil
100 kg (221 lb)
Distance between Center of Shift Lever Play and Center Cluster
283
± 15 mm (11.1 ± 0.6 in)
Spline Play between Clutch Hub and Mainshaft
0 — 0.16 mm (0 — 0.01 in)
Shift Arm Thickness (Min.)
1st / Reverse, 3rd / 2nd, 5th / 4th 9.0 mm
(0.354 in)
6th 9.3 mm (0.366 in)
Gear Inside Diameter (Max.)
1st, 2nd, 3rd, Reverse 63.069 mm (2.483 in)
4th 55.069 mm (2.168 in)
5th 48.065 mm (1.892 in)
6th 50.065 mm (1.971 in)
Main Shaft Deflection (Max.)
0.1 mm (0.004 in)
Block Ring and Dog Gear Gap (Min.)
0.5 mm (0.020 in)
Block and Clutch Hub Gap
1st / Reverse, 3rd / 2nd 3.3 — 3.7 mm (0.130 —
0.150 in)
5th / 4th, 6th 4.3 — 4.7 mm (0.17 — 0.19 in)
Clutch Housing to Transmission Case Bolt
46 N
⋅m (4.7 kg⋅m / 34 lb⋅ft)
Rear Cover Bolt
46 N
⋅m (4.7 kg⋅m / 34 lb⋅ft)
Control Box Bolt
27 N
⋅m (2.8 kg⋅m / 20 lb⋅ft)
Filler Plug
39 N
⋅m (4 kg⋅m / 29 lb⋅ft)
Drain Plug
39 N
⋅m (4 kg⋅m / 29 lb⋅ft)
Lock Nut to Coupling Driver
382 N
⋅m (39 kg⋅m / 282 lb⋅ft)
Reverse Switch
39 N
⋅m (4 kg⋅m / 29 lb⋅ft)
Neutral Switch
34 N
⋅m (3.5 kg⋅m / 25 lb⋅ft)
Vehicle Speed Sensor Driven Gear Mounting Bolt
20 N
⋅m (2 kg⋅m / 15 lb⋅ft)
Vehicle Speed Sensor
25 N
⋅m (2.5 kg⋅m / 18 lb⋅ft)
Retainer Bolt
26 N
⋅m (2.7 kg⋅m / 20 lb⋅ft)
6th Relay Lever Bolt
44 N
⋅m (4.5 kg⋅m / 33 lb⋅ft)
MANUAL TRANSMISSION (MZZ) 7B1-47
Reverse Gear Side Cover Bolt
20 N
⋅m (2.0 kg⋅m / 15 lb⋅ft)
PTO Cover Bolt
37 N
⋅m (3.8 kg⋅m / 27 lb⋅ft)
Detent Plug
27 N
⋅m (2.8 kg⋅m / 20 lb⋅ft)
Parking Brake Bracket Bolt
48 N
⋅m (4.9 kg⋅m / 35 lb⋅ft)
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