Troubleshooting - Upright MX19 Service And Parts Manual

T
4.1 I
NTRODUCTION
When troubleshooting, ensure that the work platform is resting on a firm,
level surface.
When performing any service that requires the platform to be raised, ensure
that the platform and booms are supported by a crane capable of supporting
the load.
Unplug the machine or disconnect the battery when replacing or testing the
continuity of any electrical component.
503727-002
ROUBLESHOOTING
The following section on troubleshooting provides guidelines on the types of problems users may
encounter in the field, helps determine the cause of problems, and suggests proper corrective
action.
Careful inspection and accurate analysis of the symptoms listed in the Troubleshooting Guide
will localize the trouble more quickly than any other method. This manual cannot cover all possi-
ble problems that may occur. If a specific problem is not covered in this manual, call our number
for service assistance.
Referring to Section 2.0 and 5.0 will aid in understanding the operation and function of the vari-
ous components and systems and help in diagnosing and repair of the machine.
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G P
ENERAL ROCEDURE
Thoroughly study hydraulic and electronic schematics in Section 5. Check for loose connections
and short circuits. Check/repair/replace each component in the Truth Table that is listed under
each machine function that does not operate properly.
Use the charts on the following pages to help determine the cause of a fault.
NOTE: Spike protection diodes at components have been left out of the charts to eliminate
confusion.
W A R N I N G
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Section 4
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Page 4-1