Alternator - Kubota M5640SU Workshop Manual

M5640SU, M5640DT-SU, WSM

[6] ALTERNATOR

Remove the Alternator
1. Disconnect the 2P connector (3) from alternator after turning the
main switch OFF.
2. Perform the following checkings.
(1) B Terminal
(2) Alternator
Connector Voltage
1. Turn the main switch OFF. Measure the voltage between the B
terminal (1) and the chassis.
2. Turn the main switch ON. Measure the voltage between the IG
terminal (3) and the chassis.
Voltage
B terminal – Chassis
(Main switch at OFF)
Voltage
IG terminal – Chassis
(Main switch at ON)
(1) B Terminal
(2) Alternator
No-Load Test
1. Connect the 2P connector (6) to previous positions of the
alternator after turning the main switch OFF.
2. Connect the jumper lead (3) between IG terminal (4) and B
terminal (2).
3. Start the engine and then set at idling speed.
4. Disconnect the negative cable from the battery.
5. Measure the voltage between the B terminal (2) and the
chassis.
6. If the measurement is less than the factory specification,
disassemble the alternator and check the IC regulator.
Voltage Factory spec.
(Reference)
• Once the engine has started, the alternator temperature rises
quickly up to an ambient temperature of 70 to 90 °C (158 to 194
°F). As the temperature goes higher than 50 °C (122 °F), the
alternator voltage slowly drops; at higher than 100 °C (212 °F),
it drops by about 1 V.
(1) Voltmeter
(2) B Terminal
(3) Jumper Lead
9-S15
ELECTRICAL SYSTEM
(3) 2P Connector
9Y1210365ELS0014US0
Approx. battery voltage
Approx. battery voltage
(3) IG Terminal
(4) L Terminal
9Y1210365ELS0015US0
More than 14 V
(4) IG Terminal
(5) L Terminal
(6) 2P Terminal
9Y1210365ELS0016US0
KiSC issued 07, 2009 A