Toro Z Master Z400 Series - Seat Switch

6-8 Z Master Z400 Service Manual
6
ELECTRICAL
How It Works
When starting, it functions to ensure the park brake is
in the ON position. At the same time it allows current to
owthroughtheremainderofthestartingsafetycircuit.
When the park brake is released in the (Off position) it
bypasses both neutral switches, permitting the control
levers to be used, as long as the operator is in the seat
to maintain current for the safety circuit (Fig. 393).
Fig 393 DSC-2528
1. Disconnect the switch from the wiring harness.
The park brake is a double pole switch. When the
park 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.
Plunger Not Depressed Plunger Depressed
A/BTerminals-Closed
Circuit - Continuity
A/BTerminals-Open
Circuit - No Continuity
C/DTerminals-Open
Circuit - No Continuity
C/DTerminals-Closed
Circuit - Continuity
Fig 394 brake switch a
2. Using a multimeter, follow the procedures listed
below (Fig. 394).
Testing
Seat Switch
The switch is in the safety circuit. If the engine is running
and the operator vacates the seat with either the PTO
engaged or the parking brake disengaged, the engine
will shut down.
Note: There is a delay module in the system; there
will be a slight delay before the engine shuts
down after the operator vacates the seat.
Purpose
A
B
C
D