Alternator
The alternator used on the Groundsmaster 580--D is
belt driven and attaches to the engine. If testing deter-
mines that alternator is not functioning properly, bench
inspection should be performed.
Resistance should be infinite in one direction and nearly
zero in the other. If resistance is infinite in both direc-
tions, the diode is open. If resistance is nearly zero in
both directions, the diode is closed. If the diode is open
or closed, replace the recitifer.
Note:
For information on disassembly and assembly
of the alternator used on models 30581, 30582 and
see the Mitsubishi S4S--DT Service Manual that
30583,
follows Chapter 3A -- Engine (Model 30581).
Brushes
SERVICE LIMIT
Replace the alternator brushes if they are worn to the
service limit (Fig. 18).
(WORN)
BRUSH
LENGTH
(NEW)
Brush Length
(New)
Brush Length
(Service Limit)
MODEL
Figure 18
30581
.728”
.280”
(50
(75
Amp Alternator)
(18.5mm)
(7 mm)
30581
(w/AC Kit)
.716”
(18.2 mm)
.280”
(7 mm)
Amp Alternator)
30582
& 30583 (100
.728”
.197”
Amp Alternator)
(18.5mm)
(5 mm)
Field Coil
Measure the resistance between the slip rings (Fig. 19).
If the resistance is outside of the assembly standard, re-
place the rotor.
Figure 19
MODEL
30581
Field Coil Resistance
2.4 Ohms
30581
3.0 Ohms
(with AC Kit)
30582
& 30583
2.8 Ohms
Stator Coil
Figure 20
Check for continuity between the lead wires (Fig. 20). If
no continuity exists (infinite resistance), the coil has an
open circuit and needs to be replaced.
DIODE
HEAT SINK (--)
Check for continuity between the lead wires and the sta-
tor core laminations. If continuity exists (no resistance),
the stator coil is grounded and needs to be replaced.
Rectifier
HEAT SINK (+)
DIODE LEAD WIRE
Test the resistance between each diode lead wire and
heatsink(Fig.21).Totest,connectthepositive(+)multi-
meter test lead to the diode and the negative (--) multi-
meter test lead to the heat sink, record resistance and
then switch test lead location.
Figure 21
Electrical System (S/N 30101 & Up) (Rev. E)
Page 8 -- 18
Rev. G
Groundsmaster 580--D
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