19.2 Trouble Shooting –Vacuum Motor
The vacuum motor will not turn on Traction Drive models only.
1. Verify the vacuum switch is functioning correctly. The machine should not
move in reverse with the squeegee (vacuum on) in the down position.
When squeegee is raised, the machine should back up.
2. Remove the rear panel of the machine.
3. Measure the voltage across the coil (small) terminals of the vacuum
contactor (do not go to the battery for this test.) with squeegee/vacuum
switch activated and driving the machine forward.
4. The wires will need to be connected to terminal while doing test.
Note: Lift the drive wheels off the floor before doing test.
The voltage should be 20 to 24 volts. If not go to step 5.
If the 20 to 24 volts is present, test vacuum relay step # 8.
5. Remove the diode from the contactor and test with a multi-meter.
It should have continuity in one direction. Replace, if it shorted in both
directions.
Note: The diode should be wired with the silver band closest to the red
(positive) terminal when it is mounted to the relay terminals.
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