Yanmar 4LHA-HTP Operation Manual page 650

'hapter 9 Electrical System
. Alternator
l) Assembling the rear cover
Insert pins from the outside of the rear cover. Install the
brush on the brush holder, then attach the rear cover.
After assembly, pull out the pins.
i Tightening torques
Positions
Brush holder fixing
Diode fixing
Bearing retainer fixing
Pulley nut tightening
Through-bolt tightening
10 Performance test
>nduct a performance test on the reassembled AC
nerator as follows. The following is the circuit for the
rformance test.
Brush holder
Rear cover
Tightening torque
N(kgf)-cm
3 1 4 - 3 9 2 (32 - 40)
3 1 4 - 3 9 2 (32 - 40)
3 1 4 - 3 9 2 (32 - 40)
3 9 2 3 - 5 8 8 4 (400 - 600)
3 1 4 - 3 9 2 (32 - 40)
0.25Q Resistor
Connect when
the batteries
are discharged
9-24
(1) Measuring devices
DC voltmeter 0 - 1 5 V or 0 - 3 0 V , 0J5 Class, Ipc.
0—100A, 1.0 Class, Ipc.
DC ammeter
Variable resistor 0-0.25Q, IkW, i p c .
Lamp 12V, 3W
100Q resistor 3W
0.252 resistor 25W
(2) Measuring the regulating voltage
1) When measuring devices are connected in the
performance test circuit as shown above, the charge
lamp lights.
2) Close SW, while keeping SW, open and mn the AC
generator. When the revolutions of the generator are
gradually raised, the charge lamp goes off.
3) Raise the revolutions of the A C generator, and read the
voltmeter gauge when the revolutions reach about
5,000 rpms.
NOTES: 1. Make sure that the ammeter indication at this
time is less than 5A. If the indication is over
5A, connect the 0.252 resistor. The voltmeter
indication at this time must be within the
prescribed regulating voltage value.
2. Raise the AC generator revolutions high to
make sure the regulating voltage does not
fluctuate along with changes in the revolution
speed.
(3) Precautions for measuring the regulating voltage
1) When measuring the voltage, measure the voltage
between the AC generator BAT terminal, or Battery +
terminal, and AC generator E-terminal.
2) Use a fully charged battery.
3) Measure the voltage quickly.
4) Keep SW, open for measurement.
4LHA Series