SERVICE MANUAL
Current
flows
in one direction only in
each of the six diodes. Check each diode
for directional continuity using a battery
12
Volt
Battery
Fig. 110-Exploded view of
typical Delco-Remy starting
motor used on MF230, MF235
and MF245 tractors.
1. Bualung
2.
Oil wick &
plug
S. Ori
ve housing
4. Shift lever
5. Plunger
6.
Spring
7. Solenoid
8. Thrust
wuher
9.
Snap rine
10. !Wtainer
II.
Drive p•nion
12. Fiber wuher
13. CA!nter
beoring
h
oua
i
ng
14. Buahlng
15. Armature
16. Thruat
waaber
1 7. Field coil
18.
Pole shoes
I 9.
Field frame
20.
Brushes
21. Springe
22.
Buahing
23.
Prame
Anvneter
powered
12
volt test lamp or an ohm
meter. Connect tester leads to positive
and negative side of diode, then reverse
Voltmeter
Fig. 109-Connect ammeter,
voltmeter and a switch as
shown to perform no-load
test on starting motor.
Refer
to text for specifications.
19
Paragraph
1 06
Cont.
tester
lead connections. Thst lamp should
light or ohmmeter should indicate con
tinuity in one direction only. If continui
ty is indicated in both
d
irections or if
there is no continuity in either direction,
diode is defective and rectifier assembly
must be renewed.
Check rotor field winding for open cir·
cuit by connecting test lamp or ohm
meter leads to each of the rotor slip
rings.
If
no continuity is indicated, rotor
is
faulty and must
be
renewed. Check for
continuity between the slip rings and
rotor shaft. If continuity
is
indicated,
winding is grounded and rotor must.
be
renewed.
Check for continuity between each of
the stator coil leads. Renew s
t
ator if an
open circuit is indicated. Check for con
tinuity between each of the stator coil
leads and the stator frame-
If
continui·
ty is indicated, winding is grounded and
stator must be renewed.
'Ib
reassemble alternator, reverse the
disassembly procedure whlle noting the
following special instructions: Tighten
15
45