Alternator - Kubota D1503-M-DI Workshop Manual

03-M-DI Series, WSM

(2) Alternator

(Precaution when checking)
• If disconnect the B terminal or coupler, engine will stop by emergency device.
• Do not directory connect the L terminal with the B terminal. Otherwise the three exciting diodes may be damaged.
When connecting the L terminal, insert a 3.4 W lamp between the L and B terminals.
• Always use a full charged battery.
• Be careful to observe the proper polarity of the battery. Never install the battery in the wrong direction.
• Never disconnect the battery while the alternator is operating.
NOTE
• Check the alternator with alternator test bench.
Regulating Voltage
1. Make the connections as shown in the figure, and turn on switch
SW1.
2. Increase the alternator speed to 5000
3. Turn on switch SW2. Adjust load resistance R so that the
ammeter shows 10 A.
4. Check that the voltage reading on the voltmeter is within the
factory specifications.
Regulating voltage Factory spec.
No-load Characteristics
1. Make the connection as shown in the figure, and turn on switch
SW1.
2. Increase the alternator speed so that the pointer of the ammeter
swings to the plus side.
3. Turn on switch SW1 to decrease the speed, and read the speed
at witch the voltage is equal to the factory specifications.
4. The speed must be below the factory specifications.
No-load characteristics Factory spec.
Output Characteristics
1. Make the connection as shown in the figure, and turn on switch
SW1 and SW2.
2. Increase the alternator speed while adjusting the load resistance
so that the voltage complies with the factory specifications.
3. Read the speed at which the current is equal to the factory
specifications.
4. The speed must be below the factory specifications.
5. Decrease the speed so that the current approaches zero, the turn
off switches SW1 and SW2.
Output characteristics Factory spec.
S-90
DIESEL ENGINE
-1 (rpm).
min
14.2 to 14.8 V
W1150547
-1
1150 min (rpm) or less at
13.5 V
W1150876
40 A or more at 13.5 V,
-1
5000 min (rpm)
W1151013
KiSC issued 10, 2009 A