to the engine starter solenoid and the engine fuel solenoid via the delay timer.
For model 31902 and 31903 machines, the start interlock relay sends power
to the engine ECU. The start interlock relay is energized by the TDM.
•
The Exhaust Gas Recirculation (EGR) relay is used to provide current to
the engine EGR valve (models 31902 and 31903 only). The EGR relay is
energized by the Yanmar engine ECU.
•
The start relay supplies power to the engine starter (models 31902 and 31903
only). The start relay is energized by the Yanmar engine ECU.
•
The AC condenser fans relay provides current to both of the condenser fans
and the AC clutch relay (models 31903 and 31909 only). The AC condenser
fans relay is energized by the air conditioning system thermostat.
•
The AC switch signal relay is part of the standard cab rooftop harness, but is
not used on Groundsmaster 3310 machines.
•
The AC clutch relay and the AC condenser fans relay must be energized to
engage the compressor clutch (models 31903 and 31909 only). The AC
clutch relay is energized by the thermostat as long as the minimum AC
system pressure exists (AC pressure switch closed).
Testing Relays with 5 Terminals
Refer to
for this procedure.
1. Park the machine on a level surface, lower the cutting unit (or attachment),
engage the parking brake, set the key switch to the O
FF
position and remove
the key from the key switch.
2. Disconnect the ground cable at the battery; refer to
the Battery (page 6–64)
.
3. Remove the operator’s console covers; refer to
Operator’s Console Covers (page 7–23)
.
4. Locate the relay that is to be tested and disconnect the wire harness
connectors from the relay. Check the relay and the harness connector for
damage or corrosion and clean or repair if necessary.
g256780
Figure 98
Relay with 5 terminals
Electrical System: Testing the Electrical Components
Page 6–46
Groundsmaster
®
3200, 3300 and 3310
19240SL Rev A
Summary of Contents for Groundmaster 31900
Page 4: ...Reader Comments Page 4 Groundsmaster 3200 3300 and 3310 19240SL Rev A...
Page 16: ...Safety Safety and Instructional Decals Page 1 8 Groundsmaster 3200 3300 and 3310 19240SL Rev A...
Page 86: ...Engine Service and Repairs Page 4 24 Groundsmaster 3200 3300 and 3310 19240SL Rev A...
Page 332: ...Operator Cab Service and Repairs Page 9 18 Groundsmaster 3200 3300 and 3310 19240SL Rev A...
Page 355: ......
