Service Manual

Part Numbers
78-3030
Purpose
Typically used to turn on the electric blade clutch and to function as part of
the safety interlock system.
How It Works
Contacts inside this DPDT switch electrically connect various terminals. It
is actually just two SPDT switches tripped by a single lever. One of the
SPDT switches is connected to the electric PTO clutch. When in the “off”
position, this side of the switch is open. The other half of the switch is used
by the safety interlock system. When the clutch is “off”, this side of the
switch is closed. This allows current to keep the kill relay energized so that
the mag is not grounded out.
Testing
1. Disconnect the switch from the wiring harness.
2. Verify the conditions in the table.
Part Numbers
78-9670
Purpose
This switch is typically used to turn on the electric blade clutch and to
function as part of the safety interlock system.
How It Works
Contacts inside this DPDT switch electrically connect various terminals. It
is actually just two SPDT switches tripped by a single lever. In the 724, one
side of the switch is used to ensure that the PTO switch is in the “off”
position during starting. The other side is used to turn on the clutch and to
prevent spark if the operator is out of the seat when the switch is in the
“on” position.
Testing
1. Disconnect the switch from the wiring harness.
2. Verify the conditions in the table.
Switch
PTO/Clutch
Position Lever Condition
Off Down b+a, e+d
On Up b+c, e+f
Switch
PTO/Clutch
Position Lever Condition
Off Down b+a, e+d
On Up b+c, e+f
Glossary
GLOSSARY
3-36 Demystification Guide