Isuzu N-Series. Service manual — part 409
6D3-4 CHARGING SYSTEM
DIAGNOSIS
General On-Vehicle Inspection
The operating condition of charging system is indicated by the charge warning lamp. The warning lamp comes on
when the starter switch is turned to “ON” position. The charging system operates normally if the lamp goes off when
the engine starts. If the warning lamp shows abnormality or if undercharged or overcharged battery condition is sus-
pected, perform diagnosis by checking the charging system as follows:
1. Check visually the belt and wiring connector.
2. With the engine in stop status, turn the starter
switch to “ON” position and observe the warning
lamp.
• If lamp does not come on:
Disconnect wiring connector from generator,
and ground the terminal “L” on connector side.
• If lamp comes on:
Repair or replace the generator.
N6A1034E
CHARGING SYSTEM 6D3-5
ON-VEHICLE SERVICE
Component
Generator
Removal
Preparation
• Disconnector the battery ground cable.
• Tilt the cab.
1. A/C Compressor Drive Belt (If equipped with A/C)
2. A/C Compressor (If equipped with A/C)
• After disconnecting the A/C compressor har-
ness connector, demount the compressor from
the A/C compressor bracket and fasten it with a
wire to an appropriate location together with the
hoses.
3. Vacuum Pump Oil Pipe
4. Vacuum Pump Rubber Hose
5. Vacuum Hose
6. ACG Harness
Disconnect the B terminal cable and harness con-
nector from generator.
7. Fan Belt
8. Generator
9. Adjust Plate
Installation
1. Adjust Plate
Install the adjust plate as shown in the illustration.
Legend
1. A/C compressor drive belt
6. ACG harness
2. A/C compressor
7. Fan belt
3. Vacuum pump oil pipe
8. Generator
4. Vacuum pump rubber hose
9. Adjust plate
5. Vacuum hose
N6A1035E
6D3-6 CHARGING SYSTEM
2. Generator
Notice:
Before tightening the generator, tighten in advance the
fan belt temporarily after its adjustment.
• Insert the lower fixing bolt from the rear side as
shown in the illustration, and tighten it with a nut
on the front side.
3. Fan Belt
Check the drive belt tension.
Depress the drive belt mid-portion with a 98 N (10
kg / 22 lb) force.
Check the drive belt for cranking and other dam-
age.
Fan Belt Adjustment
Fan belt tension is adjusted by moving the generator.
Tighten:
Bolt to
• (1): 40 N
⋅m (4.1 kg⋅m / 30 lb⋅ft)
• (2): 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
• (3): 46 N
⋅m (4.7 kg⋅m / 34 lb⋅ft)
4. ACG Harness
5. Vacuum Hose
6. Vacuum Pump Rubber Hose
7. Vacuum Pump Oil Pipe
Legend
1. Sliding piece
2. Adjust bolt
3. Adjust plate
4. Nut
5. Generator
N6A1036E
N6A0344E
Drive Belt Deflection
mm (in)
New belt
8 — 12 (0.31 — 0.47)
Reuse belt
10 — 14 (0.39 — 0.55)
N6A0037E
N6A0038E
CHARGING SYSTEM 6D3-7
Tighten:
Vacuum pump oil pipe to
• Cylinder body side: 41 N
⋅m (4.2 kg⋅m / 30 lb⋅ft)
• Generator side: 23 N
⋅m (2.3 kg⋅m / 17 lb⋅ft)
8. A/C Compressor (If equipped with A/C)
• Tighten the fixing bolts to the specified torque.
Tighten:
A/C compressor bolt to 48 N
⋅m (4.9 kg⋅m / 35 lb⋅ft)
Notice:
When installing the compressor fixing bolts, tighten first
the 2 bolts on the rear side, and then the remaining 2 on
the front side.
9. A/C Compressor Drive Belt (If equipped with A/C)
• Install the drive belt adjust belt tension by ad-
justing bolt and tighten the locking nut to the
specified torque.
• Depress the drive belt mid-portion with a 98 N
(10 kg / 22 lb) force.
Tighten:
Locking nut to 27 N
⋅m (2.8 kg⋅m / 20 lb⋅ft)
• Connect the negative battery cable.
• Lower the cab.
N6A1040E
N6A1041E
Legend
1. Belt deflection
Drive Belt Deflection
mm (in)
New belt
16 — 20 (0.63 — 0.79)
Reuse belt
18 — 22 (0.71 — 0.87)
N6A1042E
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