Isuzu N-Series. Service manual — part 809
7B-6 MANUAL TRANSMISSION (MSB)
Installation
1. Vehicle Speed Sensor Driven Gear Assembly
Tighten:
Fixing bolt to 15 N
⋅m (1.5 kg⋅m / 11 lb⋅ft)
2. Vehicle Speed Sensor with Key Rod
Tighten:
Fixing bolt to 25 N
⋅m (2.5 kg⋅m / 18 lb⋅ft)
3. Wiring Connector
Back-up Light Switch and Neutral Switch
Replacement
Removal
1. Wiring Connector
2. Switch
Inspection and Repair
• When there is continuity between the terminals in
the condition as it is, and when the continuity be-
tween the terminals is turned off by pressing the
ball of the switch, the switch is normal.
Installation
1. Switch
• Apply liquid gasket (Three Bond 1141 or equiv-
alent) to the switch’s threaded portion to pre-
vent oil leakage, and install the switch to the
control box.
• Color of connector
Back-up Light Switch: Brown
Neutral Switch: Gray
Tighten:
Switch to 34 N
⋅m (3.5 kg⋅m / 25 lb⋅ft)
2. Wiring Connector
Rear Oil Seal Replacement
Removal
• Raise vehicle and support with suitable safety
stands.
1. Propeller Shaft
• Put a reference mark (1) on the flange yoke and
the parking brake drum.
Legend
1. Back-up light switch
2. Neutral switch
Switch Operating Stroke
mm (in)
0.93 (0.037)
N7A0042E
N7A0043E
MANUAL TRANSMISSION (MSB) 7B-7
• Disconnect the propeller shaft at flange yoke.
• Put aside the propeller shaft and tie it to the
frame so it does not interfere with servicing
work.
2. Parking Brake Drum
• Remove the screw and the adjust hole cover.
• It may be necessary to back off the shoe adjust-
er.
3. Lock Nut
• Make sure to raise the caulking of the coupling
driver lock nut, then remove the lock nut.
• Use the handle to remove the lock nut.
Handle: 5-8840-2043-0
4. Coupling Driver
• Remove the coupling driver using the universal
puller.
Universal Puller: 5-8840-2027-0
• Remove the conical washer and the O-ring.
5. Parking Brake Assembly
N7A0044E
N7A0045E
N7A0046E
N7A0047E
7B-8 MANUAL TRANSMISSION (MSB)
6. Oil Seal
• Use the screwdriver to remove the oil seal from
the rear cover.
Caution:
Take care not to damage the sealing seat of the rear
cover.
Installation
1. Oil Seal
• Apply engine oil to the new oil seal outer cir-
cumference and apply multi-purpose grease to
the oil seal lip.
• Use the oil seal installer to install the oil seal to
the rear cover.
Oil Seal Installer: 5-8840-2242-0
2. Parking Brake Assembly
Tighten:
• Parking brake bolts to 25 N
⋅m (2.5 kg⋅m / 18 lb⋅ft)
• Parking brake nut to 113 N
⋅m (11.5 kg⋅m / 83 lb⋅ft)
3. Coupling Driver
4. Lock Nut
• Install the O-ring and the conical washer.
The conical washer is to be set up with its iden-
tification groove to the nut side.
Caution:
Do not reuse the lock nut.
• Apply the engine oil to the setting face of the
new lock nut and tighten it up to the specified
torque.
Handle: 5-8840-2043-0
Tighten:
Lock nut to 226 N
⋅m (23.0 kg⋅m / 166 lb⋅ft)
• Align the lock nut with the V-shaped groove at
the tip of the main shaft, and caulk the nut lip
portion by using a chisel.
(Round edge approximately 1 mm (0.04 in)
×
60
°).
• As shown in the illustration, be sure to caulk the
nut lip so that the clearance between the V-
shaped groove portion at the tip of the main
shaft and the caulked up lip (A) is less than 1.5
mm (0.06 in), and the caulking length (B) is 5
mm (0.2 in) or more.
Caution:
Be sure to confirm that there is no crack at the caulked
portion of the end nut after caulking.
N7A0048E
N7A0049E
N7A0048E
MANUAL TRANSMISSION (MSB) 7B-9
5. Parking Brake Drum
• Adjust the parking brake after installation.
1) Rotate the brake drum to align the adjust hole
with the adjuster.
2) Move the camshaft lever from side to side sev-
eral times to center the brake shoes.
3) Insert a screwdriver into the hole and rotate the
adjuster by pushing it upward until the shoes
drag on the drum.
4) Back off the adjuster 30 notches.
• Install the adjust hole cover.
Tighten:
Adjust hole cover bolt to 8 N
⋅m (0.8 kg⋅m / 69 lb⋅in)
6. Propeller Shaft
• Line up reference mark (1).
Tighten:
Propeller shaft bolt to 66 N
⋅m (6.7 kg⋅m / 48 lb⋅ft)
• Remove the safety stands.
Transmission Assembly Replacement
Removal
• Raise vehicle and support with suitable safety
stands.
1. Propeller Shaft
• Put a reference mark (1) on the flange yoke and
the parking brake drum.
N7A0050E
N7A0045E
N7A0044E
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