Isuzu N-Series. Manual — part 537
Engine Electrical 6D-15
Rectifier Assembly
Legend
1. Voltmeter
2. Switch 1
3. DC Regulated Power Supply
4. Lamp 2
5. Lamp 1
6. Switch 3
7. Switch 2
8. Pulse Generator
9. Output Signal
Test circuit
Refer to the judgment criteria shown in the Table below.
Carefully check Items 1
− 5. If all the items are OK, the
IC regulator is normal.
Circuit components
Judgment criteria
V
+
-
5~30V
1kHz
S
L
B
E
P
2
1
3
4
5
6
7
8
9
N6A6604E
1
DC regulated power supply
0
− 30 volts variable with output of 1 ampere or more
2
Lamps (2)
24 volts, 1.8 watts
3
Switches (3)
-----
4
DC voltmeter
0
− 60 volts, 0.5 grade
5
Pulse generator (Oscillator)
5
− 30 volts output at a frequency of 1kHz
No.
Switch
1
Switch
2
Switch
3
Voltmeter
reading
Lamp condition
Remarks
Lamp 1
Lamp 2
1
ON
OFF
OFF
24V
On (dim)
ON
Initial excitation check
2
ON
ON
OFF
On or
flashing
OFF
Full excitation check
3
ON
ON
OFF
32V
Off or
on (dim)
Lamp 1 off or dimly lit when the voltmeter
shows less than 24 volts or 32 volts
4
OFF
ON
OFF
24V
On or
flashing
ON
Stator and brush separation check
5
ON
ON
ON
36V
On
Excess voltage check
6D-16 Engine Electrical
Reassembly
Important:
• When connecting the stator coil leads and diode
leads using solder, use long-nose pliers and work
as quickly as possible to prevent the heat from
transferring to the diodes.
1. Stator.
2. Diode brush regulator assembly.
3. Stator and diode brush regulator assembly.
4. Rear cover.
5. Front cover.
6. Front ball bearing.
7. Bearing retainer.
8. Rotor and rear bearing.
9. Spacer.
10. Fan.
11. Pulley.
12. Pulley nut.
Tighten:
Pulley nut (50A) to 98.0 N
⋅m (10 kg⋅m/72.3 lb⋅ft)
Pulley nut (60A, 80A) to 107.8 N
⋅m (11 kg⋅m/79.5 lb⋅ft)
13. Rear cover and stator assembly.
Use a pair of long-nose plier to connect the stator
coil leads and the rectifier leads.
Finish the work as quickly as possible to prevent
the rectifier from heat transferred by the soldering.
Insert the pin from the outside of the rear cover.
Press the brushes into the brush holder. Complete
the assembly procedure.
14. Pulley and rotor assembly.
• Install the pulley and rotor assembly
The rear ball bearing is pressed into the wheel
eccentric groove. The bearing ring projects from
the groove.
During installation, rotate the bearing to the point
of minimum bearing ring projection.
15. Through bolts.
• Place a guide bar through the holes in the front
cover and rear cover flange for proper
alignment. Install the through bolts.
• Remove the tape from the splines.
Tighten:
Through bolts to 4 N
⋅m (0.4 kg⋅m/35 lb⋅in)
16. Vacuum pump assembly.
N6A6605E
Pin
N6A6606E
Projection part
(0.65mm blow)
Ring
eccentric groove
N6A6607E
Engine Electrical 6D-17
• Position the rotor, with the serrated boss turned
up, on the housing.
Legend
1. Housing
2. Vane
3. Serrated Boss
4. Pump Rotor
• Align the holes in the housing and rotor.
• Install vanes into the slits in pump rotor.
The vanes must be installed with the round side
turned outward.
• After installation of O-ring, install the side plate.
Legend
1. Side Plate
2. Bolt
• Install the vacuum pump assembly to the back
of the generator with 3 screws.
Tighten:
Vacuum pump screws to 7 N
⋅m (0.7 kg⋅m/61 lb⋅in)
• Install 5 cc (0.016 oz) engine oil in the filler port,
then check that the generator pulley can be
turned smoothly by hand.
Installation
1. Generator.
Tighten:
Bracket Mount Bolt to 48 N
⋅m (4.9 kg⋅m/35.4 lb⋅ft)
2. Adjusting bolts.
Tighten:
Adjusting Nut to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
3. Drive belts.
Tighten:
Lower mount bolt to 40 N
⋅m (4.1 kg⋅m/30 lb⋅ft)
4. Vacuum and oil hoses at the vacuum pump.
5. Electrical wiring at the generator.
• Battery negative cable.
6. Install the A/C compressor. (Refer to “Engine
Assembly” in Section 6A.)
1
3
4
2
N6A6608E
1
2
N6A6609E
6D-18 Engine Electrical
Main Data and Specifications
Rated Voltage
24 V
Rated Output
50/60/80 amp
Rated Output at 5000 RPM
More than 42/50/75 amp
Regulated Voltage
28.0 – 29.0 V
Brush Length
Standard
25 mm (0.984 in)
Limit
6.5 mm (0.256 in)
Slip Ring Diameter
Standard
31.7 mm (1.248 in)
Limit
30.6 mm (1.205 in)
Generator Pulley Direction (Viewed From Pulley Side) Clockwise Pulley
Pulley Diameter
82 mm (3.23 in)
Generator Weight (With Vacuum Pump)
50A: 7.4 kg (16.3 lb)
60A: 9.0 kg (19.8 lb)
80A: 9.6 kg (21.2 lb)
Maximum Vacuum Pump Output
90.7 kPa (0.29 kg/cm
2
/ 13.2 psi)
Vacuum Pump Vane
Standard Length
17.0 – 18.0 mm (0.669 – 0.709 in)
Vacuum Pump Housing Inside Diameter
Standard
69.5 – 69.6 mm (2.736 – 2.740 in)
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