Toro 4100-D service manual Traction Neutral Switch, Diode Assemblies, Multimeter, Continuity

Traction Neutral Switch

The traction neutral switch is closed when the traction pedal is in the neutral position and opens when the pedal is depressed in either direction. The switch is located on the right side of the piston (traction) pump (Fig. 48).

Testing

Test the switch by disconnecting the wires from the switch terminals and connecting a continuity tester across the two switch terminals. With the engine turned off, slowly push the traction pedal in a forward or reverse direction while watching the continuity tester. There should be indications that the traction neutral switch is opening and closing. Allow the traction pedal to return to the neutral position. There should be continuity across the switch terminals when the traction pedal is in the neutral position.

See the Eaton Model 72400 Servo Controlled Piston Pump Repair Information at the end of Chapter 4 -- Hy- draulic System for disassembly and assembly proce- dures for the neutral switch.

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Figure 48

1. Piston pump (bottom) 2. Neutral switch

Diode Assemblies

The Groundsmaster 4100--D electrical system includes several diode assemblies (Fig. 49) that are used for cir- cuit protection and circuit logic control. The diodes plug into the wiring harness at various locations on the ma- chine.

The diodes D2, D4, D5 and D6 are used for circuit protection from inductive voltage spikes that occur when a hydraulic valve solenoid is de--energized. Diode D2 is in the Transport/Mow circuit, D4 is in the left cutting deck circuit, D5 is in the front cutting deck circuit and D6 is in the right cutting deck circuit.

Diode D9 provides logic for the high temperature warn- ing system.

Diode D3 provides a latching circuit for the cutting deck when in the lowered position.

If the machine is equipped with the optional cruise con- trol kit, two (2) additional diodes are used. Diode D7 in this kit is used for circuit protection that occur when a hy- draulic valve solenoid is de--energized. Diode D8 pro- vides a latching circuit to keep the cruise relay energized.

Testing

The diodes can be individually tested using a digital multimeter (diode test or ohms setting) and the table to the right.

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Figure 49

1.	Diode	3. Female terminal
2.	Male terminal

Multimeter	Multimeter
Red Lead (+)	Black Lead (--)	Continuity
on Terminal	on Terminal
Female	Male	YES
Male	Female	NO

Electrical System

Groundsmaster 4100--D Page 5 -- 31 Electrical System