Pto circuit, Rzt-s – Cub Cadet RZT-S Series User Manual
Page 82
RZT-S
76
PTO Circuit
Basic Operation: See Figure 7.24.
1.
With the key switch in any position other than OFF,
the L terminal supplies power to the windings of the
PTO relay and to the C-COM terminal of the PTO
switch.
2.
The PTO clutch gets power from the L terminal of
the key switch through the C-NO terminal of the
PTO switch when it is turned ON.
3.
The PTO clutch gets ground through the PTO relay
COM terminal via the PTO relay NC terminal when
the relay is not energized.
Safety Circuits:
There are some conditions when it is best to automati-
cally turn off the mower deck to ensure safety.
•
When the mower is put in reverse, the cutting
blades should turn off.
•
When the operator leaves the seat for any rea-
son, the cutting blades should turn off.
NOTE: When the operator leaves the seat without
setting the park brake, the engine turns off
stopping the blades as well.
1.
The PTO clutch loses its ground when the PTO
relay is energized. See Figure 7.25.
1a.
The reverse switch has NO (Normally Open) contacts.
• A green wire from one terminal is a ground path.
• A Yellow/black trace wire on the second terminal leads to the ground terminal of the PTO relay winding.
1b.
When the mower is put in reverse, the plunger on the switch is depressed, closing the contacts.
1c.
The closed contacts complete a ground path that reaches the PTO relay windings, and the PTO relay is
energized when the mower is put in reverse.
2.
The seat switch contains two sets of contacts. The set with the Yellow/black trace wire leads to ground when
the contacts of the seat switch are closed. See Figure 7.25.
2a.
When the operator leaves the seat, the seat switch connects the yellow wire to a ground path.
2b.
That ground path grounds the PTO relay windings when the mower is put in reverse.
NOTE: The seat switch connector is a shorted NC connector. That means, when the connector is unplugged a
tiny jumper inside the connector shorts out the contacts. When the connector is shorted, the circuit
thinks that the seat is empty.
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Figure 7.24