Troubleshooting
PROBLEM POSSIBLE CAUSE PROCEDURE OR ACTION
Brake does not release. Key switch is in the OFF position. Turn key switch to the ON position.
Battery is not connected or prop-
erly charged.
Connect or clean battery connec-
tions. Charge if necessary.
Handle is not in the BRAKE OFF
position.
Move the handle to the BRAKE
OFF position.
Control handle arm prox switch is
out of adjustment/damaged.
Adjust/replace control handle arm
prox switch. See the section Elec-
trical System 2200YRM1508.
Brake coil open circuit. Measure coil resistance. Refer to
Brake Check in this section. If re-
sistance is above specification, re-
place the brake assembly.
Brake coil has shorted to frame or
between the windings.
Measure coil resistance. Refer to
Brake Check in this section. If re-
sistance is below specification, re-
place the brake assembly. Check
coil for short to frame using an
ohmmeter. If shorted to frame, re-
place the brake assembly.
Incorrect or no voltage supplied to
brake.
Measure voltage to brake using a
voltmeter. If voltage is not 24 VDC
±10%, troubleshoot brake wiring.
Troubleshoot electrical system and
controller.
Debris pollution of residual gap. Clean air gap. Ensure that residual
gap returns to 0-0.06mm.
Brake does not hold truck loaded to
capacity on 10% grade.
Air gap is too large. Replace the brake assembly.
Friction disk is too worn. Replace the brake assembly.
Brake hub damaged. Replace brake and hub assembly.
Troubleshooting 1800 YRM 1505
6
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