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Section 4
T
ROUBLESHOOTING
4.1 I
NTRODUCTION
The following section on troubleshooting provides guidelines on the types of problems users may
encounter in the field, helps determine the causes 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 toll free
number for service assistance.
Referring to Sections 2 and 5 will aid in understanding the operation and function of the various
components and systems and help in diagnosing and repairing the machine.
G
ENERAL
P
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 Tables 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 for clarity.
U
P
R
IGHT
USA
Tel: 1-559-891-5200
FAX: 1-559-891-8931
U
P
R
IGHT
I
RELAND
Tel: +353-1-202-4100
FAX: +353-1-202-4105
WARNING
!
!
When troubleshooting, ensure that the work platform is on a firm, level
surface.
When performing any service that requires the platform to be raised, ensure
that the platform is braced as described on page 3-4.
Unplug the machine or disconnect the battery when replacing or testing the
continuity of any electrical component.
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