Toro Groundsmaster 7210, Руководство по обслуживанию

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Diode Assemblies
Several identical diodes are used on the Groundsmaster 7210 machines. The
maximum current allowed through any of the diodes is 6 A. The diode assemblies
can be identified by a black color, diode symbol, and Toro Part Number on the
end of the diode assembly body (
Figure 161 ).
A diode assembly is used for circuit protection from the voltage spikes that occur
when the engine starter solenoid is de-energized. This diode plugs into the
engine wire harness near the fuel water separator; refer to the Engine Wire
Harness Drawing in Appendix A—Foldout Drawings.
A diode assembly is used to protect the engine ECU from reverse polarity in
the EGR relay circuit. This diode plugs into the engine wire harness near the
Yanmar engine ECU; refer to the Engine Wire Harness Drawing in Appendix
A—Foldout Drawings.
A diode assembly is used to protect the engine ECU from reverse polarity in
the alternator circuit. This diode plugs into the engine wire harness near the
Yanmar engine ECU; refer to the Engine Wire Harness Drawing in Appendix
A—Foldout Drawings.
A diode assembly is used to protect the PTO circuit from the voltage spikes that
occur when the PTO switch is engaged. This diode plugs into the machine wire
harness below the operator seat; refer to the Platform Wire Harness Drawing in
Appendix A—Foldout Drawings.
A diode in the raise/lower circuit is used for circuit logic. When the lift switch is
pressed to raise, this diode allows both lift manifold solenoids to be energized.
When the lift switch is pressed to lower, this diode prevents the solenoid marked
B in the schematic from being energized. This diode plugs into the machine wire
harness below the operator seat; refer to the Platform Wire Harness Drawing in
Appendix A—Foldout Drawings.
In the optional rear lift kit, 4 diodes are used for circuit logic.
In the optional debris blower kit, a diode is used to prevent voltage spikes when
the hydraulic solenoid valve in the kit is de-energized.
Testing the Diode Assembly
g034714
Figure 161
1. End of the diode body 3. Male terminal
2. Diode assembly 4. Female terminal
The diode shown in Figure 161 can be tested by using a digital multimeter (diode
test or ohms setting); refer to Diode Test Table (page 5–38) .
Groundsmaster 7210 Page 5–37 Electrical System: Testing the Electrical Components
16222SL Rev C