Service Manual

Part Numbers
40-8200
Purpose
Used as part of the safety interlock circuit, it is typically used to monitor
whether or not an operator is in the seat.
How It Works
This SPDT micro switch has three terminals. The lever is spring loaded in
the “up” position. When the button is pushed down, continuity switches
from COM and NC to COM and NO.
Testing
1. Disconnect the switch from the harness.
2. Verify the conditions in the table.
Part Numbers
28-4250
Purpose
This switch monitors whether the transmission in in neutral or in gear.
How It Works
This unique SPST switch is actuated by a ball that rides against a pivoting
bracket. When the transmission is in neutral, the ball falls into a hole which
closes the switch. When the transmission is in gear, the bracket depresses
the ball which, in turn, opens the switch.
Testing
1. Disconnect the switch from the wiring harness, but do not remove.
2. Check first to ensure that there is NO continuity between either terminal
and ground. (This type failure can produce some VERY unusual
symptoms.)
3. With the transmission in neutral, verify that the terminals have continuity.
4. With the transmission in gear, make sure that the terminals are not
continuous.
5. If the switch failed step 3 or 4, remove the switch and depress the ball
manually to test. If the switch passes, the shift bracket is probably the
source of the difficulty.
Switch
Micro
Button Condition
Up COM+NC
Down COM+no
Switch
Neutral
Glossary
GLOSSARY
Demystification Guide 3-31