Isuzu N-Series. Manual - part 413
6D3-20 CHARGING SYSTEM
• Increase the number of the generator rotations
gradually until the reading of the voltmeter indi-
cates 27V. Measure the number of rotations at
this time.
4. Output current measurement
• Set the resistance of the variable resistor at the
minimum, and rotate the generator with SW1
and SW2 closed.
• While keeping the voltage steady at 27V after
adjusting the variable resistor, read the indicat-
ed value of the ammeter at the generator rota-
tion of 5,000 rpm.
Current at 27V with 5,000 rpm = 35A or more (for
35A specification)
Current at 27V with 5,000 rpm = 45A or more (for
50A specification)
5. Unit test of vacuum pump
• With a pipe arrangement as shown in the illus-
tration, use the vacuum pump tester to conduct
the measurement.
• Pour about 20 liter (5.28 US gal/4.40 UK gal) of
engine oil into the vacuum pump tester.
• Increase the generator rotations gradually, and
check to see if the engine oil is fully circulated
by discharging oil from the exhaust side of the
vacuum pump.
• Close the release valve and measure the “vac-
uum characteristic” and the “vacuum drop char-
acteristic (air tight characteristic)”. Then check
the obtained values based on the following ta-
ble.
N6A1082E
N6A1085E
N6A1662E
N6A1663E