Yale MPB040-E User Manual

Troubleshooting 1800 YRM 1005
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.
Handle is not in the BRAKE OFF po-
sition.
MovethehandletotheBRAKE OFF
position.
Control handle arm prox switch is out
of adjustment/damaged.
Adjust/replace control handle arm prox
switch. See the section Electrical
System 2200 YRM 1007.
Coil is open. Measure coil resistance. If resistance
is too high (above 30.24
), replace the
brake assembly.
Coil has shorted to frame or between
the windings.
Measure coil resistance. If resistance
is too low (below 27.36
), replace the
brake assembly.
Check coil for short to frame using an
ohmmeter. If shorted to frame, replace
the brake assembly.
Incorrect or no voltage supplied to
brake.
Measure voltage to brake using a volt-
meter. If voltage is not 24 VDC ±10%,
check connector.
Troubleshoot electrical system.
Air gap is too large. Replace the brake assembly.
Brake doe
s not hold truck
loaded t
o capacity on 10%
grade.
Air gap is
too large.
Replace t
he brake assembly.
Frictio
ndiskistooworn.
Replace
the brake assembly.
Brake h
ub damaged.
Replac
ebrakeandhubassembly.
8

Yale MPB040-E Specifications

General

Brand	Yale
Model	MPB040-E
Category	Lifting Systems
Language	English