Service Manual

260 Series Tractor Service Manual 6 - 9
ELECTRICAL SYSTEMS
Figure 235 2-24
Microswitches
Purpose
Microswitches are used to monitor whether or not a
lever or pedal is in the correct position.
How It Works
This SPDT (Single Pole Double Throw) microswitch
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 O.
Testing
1. Disconnect the switch from the harness.
2. Using a multimeter (ohm), connect one meter lead
to the “COM” terminal, and other lead to the “NC”
terminal.
3. With the switch in the spring loaded “up” position,
there should be continuity; the switch is operating
properly. Push the button “down”. There should
be no continuity; the switch is operating properly.
4. Connect one meter lead to the “COM” terminal
and the other lead to the “NO” terminal.
5. With the button in the “OUT” spring loaded
position, if there is no continuity, the switch is
operating properly.