Inspection And Adjustment - Yanmar 3JH3E Service Manual

Chapter 9 Electrical System
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3,4JH3(B)(C)E
2) To replace the IC regulator, disconnect the soldered
joint the IC regulator and pull out the two bolts. Do not
remove these two bolts except when replacing the IC
regulator.
. I .
-
a
5-8 Inspection and adjustment
(1) Diode
Between terminals
Tester wire
+ side
U.V.W.
- side
Between terminals
Tester wire
+ side
U.V.W.
- side
u
+
side diode
--c
- side diode ~ ~
I
Current direction
BAT ( +side diode)
+ side
- side
----------
No continuity
Continuity
-----
E ( -side diode)
+ side -side
----
continuity
No Continuity
=-------------·
V
w
➔
BAT
,=
U.V.W.: terminal from the stator coil
Current flows only in one direction in the diode as shown
in Fig. 181. Accordingly, when there is continuity
between each terminal (e.g. BAT and U), the diode is in
normal condition. When there is no continuity, the diode is
defective.
When the tester is connected in the reverse of above,
there should be no continuity. If there is, the diode is
defective.
9-34
After repeating the above test, ii any diode is found to be
defective, replace the diode assembly. Since there is no
terminal on the auxiliary diode, check the continuity
between both ends of the diode.
CAUTION: Do not use high tensife insulation resistance
such as meggers, etc. for testing. The diode
may burn out.
(2)
Rotor
Inspect the slip ring surface, rotor coil continuity and
insulation.
1)
Inspecting the slip ring surface
Check if the surface of the slip ring is sufficiently
smooth. If the surface is rough, grind the surface with
No. 500-600 sand paper. If it is contaminated with
oil. etc., wipe the surface clean with alcohol.
Standard Wear limit
Slip ring outer dia.
<p31.6mm
,f,30.6mm
2) Rotor coil continuity test
Check the continuity in the slip ring with the tester. If
there is no continuity, there is a wire break. Replace
the rotor coil.
Resistance value
ol~\
\\--;_!~~ \
, -
'------~,
Approx.
2.580
at
20°C
Printed in Japan
HINSHI-H8009