Toro Z Master Z597 Service Manual page 129

ELECTRICAL
How It Works
In the start position it is used to ensure the park brake
is in the ON position. At the same time it allows current
to flow through for safety circuit. When the park brake
is released in the OFF position it bypasses both neutral
switches, as long as the operator is in the seat to
maintain current for the safety circuit (Fig. 354).
Testing
1. Disconnect the switch from the wiring harness.
The park brake is a double pole switch. When the park
6
brake is in the On position, a pair of closed terminals
is part of the starting safety interlock circuit. When
the brake is released after starting, the other pair of
terminals closes, bypassing the neutral switches and
applying power to the seat switch circuit.
6-8
Fig 354 DSC-2528
2. Using a multimeter, follow the procedures listed
below (Fig. 355).
A
B
Fig 355
Plunger Not Depressed
A/B Terminals – Closed
Circuit – Continuity
C/D Terminals – Open
Circuit – No Continuity
Z Master 597 Diesel Series Service Manual
C
D
brake switch
Plunger Depressed
A/B Terminals – Open
Circuit – No Continuity
C/D Terminals – Closed
Circuit – Continuity