Relays - Toro Greensmaster 3120 Service Manual

Relays

Identifying the Relays and their Functions
Greensmaster 3120
17230SL Rev C
g223739
1. Control panel shield
2. Relays K1 – K6
Several relays are used on the Greensmaster 3120 machine. The relays are
identical five (5) terminal relays that are located toward the front of the machine;
refer to Figure 92).
Note: Refer to the Electrical Schematics and Wire Harnesses in
(page A–1) for additional relay circuit information.
Kill Relay (K1) When energized, the kill relay provides a path to ground so the
starter solenoid coil can be energized. When de-energized, the kill relay provides
a path to ground for the engine magneto to stop the engine. The kill relay is
located under the control panel on the left side of the operator seat.
Start Safety Relay (K2) The start safety relay ensures that the function control
lever is in neutral before the engine can be started. Both the start safety relay
and the kill relay must be energized for the engine to crank. The start relay is
located under the control panel on the left side of the operator seat.
Joystick relay (K3) The joystick relay is energized by the joystick lower switch.
The relay supplies power to the solid state timer used when lowering the cutting
units. The joystick relay is located under the control panel on the left side of
the operator seat.
Mow Relay (K4) When energized, the mow relay supplies power to the reel
engage solenoid valve coil (S1 for machines without backlap or S1R1 for
machines with backlap) to be energized for cutting unit operation. The mow relay
is located under the control panel on the left side of the operator seat.
Figure 92
3. Relay K8
4. Relay K7
Page 5–23 Electrical System: Testing the Electrical Components
Appendix A