Alternator; Checking - Kubota Z400-B Handbuch

[5] ALTERNATOR [V800-B]
CHECKING
(Precautions when testing)
1. Do not directly connect terminal "L" with terminal "B".
Otherwise, the three exciting diodes may be damaged.
When connecting terminal "L", insert a 3.4 W lamp be ­
tween terminals "L" and "B".
2. Always use a fully charged battery.
3. Be carefu I to observe the proper polarity of the battery.
Never install the battery in the wrong direction.
4. I\lever disconnect the battery while the alternator is
operating.
B
Checking the Regulated Voltage
1. Make the connections as shown in the figure and turn on
switch "SW1".
2. I ncrease the alternator speed to 5,000 rpm.
3. Turn on switch "SW2". Adjust load resistance "R" so
that the ammeter shows 1 OA.
4. Check that the voltage reading on the voltmeter is within
the factory specifications.
No Load Characteristics
1. Make the connections as shown in the figure above and
turn on switch "SW1".
2. I ncrease the alternator speed so that the pointer of the
ammeter swings to the plus side.
3. Turn off "SW1" to decrease the speed and read the speed
at which the voltage is equal to the factory specification.
4. The speed must be below the factory specification.
No load Factory 1400 rpm or less
characteristics specification at 13.5 V
S-157