Yanmar 4LHA-DTP, Operation Manual

Page: 649 / 670

Chapter 9 Electrical System
4. Alternator
4LHA Seri
(6) IC regulator
Connect the variable resistance, two 12V batteries,
resistor, and voltmeter as shown in the diagram.
1) Use the following measuring devices.
Wind the wire 1.5 times
around the terminal groove.
Resistor (R,)
Variable resistor (Rv)
Battery (BAT,, BAT,)
DC voltmeter
100Q, 2W, Ipc.
0—300Q, 12W, ipc.
12V, 2pcs.
0—30V, 0.5 class 1pc.
(measure at 3 points)
2) Check the regulator in the following sequence, accor-
ding to the diagram.
a) Check V, (BAT, + BAT, voltage). If the voltage is
20—26V, both BAT, and BAT, are normal.
b) While measuring V, (F-E terminal voltage), move Rv
gradually from the 0-position. Check if there is a
point where the V, voltage rises sharply from below
2.0V to over 2.0V. If there is no such point, the
regulator is defective. Replace the regulator. If there
is a sharp voltage rise when testing, return the Rv to
the 0-position, and connect the voltmeter to the V,
position.
c) While measuring V, (voltage between L-E terminals),
move Rv gradually from the 0-position. There should
be a point where the voltage of V, rises sharply by
2—6V. Measure the voltage of V, just before this
sharp voltage rise. This is the regulating voltage of
the regulator. If this voltage of V, is within the stan-
dard limit, the regulator is normal. If the voltage
deviates from the limit, the regulator is defective.
Replace the regulator.
R,
- W -
JT
BAT,.
©
BAT,
0-position
4-9 Reassembling the alternator
Reassembly is done in the reverse order of disassembly.
For reassembly, be careful of the following points. (Refer
to 4—7 disassembling alternator).
(1) Assembling the brush regulator
1) Solder the brush.
Position the brush as shown in the drawing and solder
it. Be careful not to let the solder drip into the pig tail
(lead wire).
11±0.5mm
(0.413~0.4528in.)
Brush
1mm (0.039in.)
Mount the insulation tube
on the terminal surface.
NOTES: 1. Use non-acid type paste.
2. The soldering iron temperature is 300 ~
350
o
C.
2) Mount the IC regulator on the brush holder as il-
lustrated, and press in the M5 bolt. Do not forget to
assemble the bushing and the connecting plate at the
same time.
(If the bushing is left out, the output terminal will be
earthed and the battery short-circuited).
M5 bolt
NOTES: 1. Insertion pressure is 981 (100) N(kgf)
2. Insert vertically.
(2) Connecting the brush regulator assembly and diode
1) Check the rivets
Place the rivets as shown in the figure, and then calk
them using the calking tool.
Calking force
4903 (500) N(kgf)
2) Connect the brush to the diode.
Insert the brush side terminal into the diode terminal,
calk it, and then solder into place.
3.0 mm (0.1181 in.) dia. rivet.
Rivetting pressure
4903 (500) N(kgf)
9-23