SECTION 3 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS
3121801 3-13
3.6 TROUBLESHOOTING
General
This section contains troubleshooting information to be used
for locating and correcting most of the operating problems
which may develop in the aerial platform. If a problem should
develop which is not presented in this section or which is not
corrected by listed corrective actions, technically qualified
guidance should be obtained before proceeding with any
maintenance.
Troubleshooting Information
The troubleshooting procedures applicable to the aerial plat-
form are listed and defined in following troubleshooting
tables.
Each malfunction within an individual group or system is fol-
lowed by a listing of probable causes which will enable deter-
mination of the applicable remedial action. The probable
causes and the remedial action should, where possible, be
checked in the order listed in the tables.
It should be noted that there is no substitute for a thorough
knowledge of the equipment and related systems.
It should be recognized that the majority of the problems aris-
ing in the machine will be centered in the hydraulic and elec-
trical systems. For this reason, every effort has been made to
ensure that all likely problems in these areas are given the full-
est possible treatment. In the remaining machine groups, only
those problems which are symptomatic of greater problems
which have more than one probable cause and remedy are
included. This means that problems for which the probable
cause and remedy may be immediately obvious are not listed
in this section.
The first rule for troubleshooting any circuit that is hydrauli-
cally operated and electrically controlled is to determine if the
circuit is lacking hydraulic oil and electrical control power. This
can be ascertained by overriding the bypass valve (mechani-
cally or electrically) so that oil is available to the function valve,
then overriding the function valve mechanically. If the func-
tion performs satisfactorily, the problem exists with the con-
trol circuit.
Hydraulic Circuit Checks
The first reference for improper function of a hydraulic system,
where the cause is not immediately apparent, should be the
Troubleshooting Chart. The best place to begin the problem
analysis is at the power source (pump). Once it is determined
that the pump is serviceable, then a systematic check of the
circuit components, beginning with the control, would follow.
For aid in troubleshooting, refer to the Illustrated Parts Manual
for hydraulic diagrams of the various circuits
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