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TM 10-3930-664-24
Section V. UNIT TROUBLESHOOTING
2-12.
GENERAL.
a.
This section contains unit maintenance level troubleshooting information for identifying and correcting
malfunctions which may develop during forklift operation. Each malfunction or trouble symptom is addressed and is
followed by a series of inspections or tests necessary to determine the probable cause and corrective action.
b.
The Unit Troubleshooting Symptom Index, Table 2-2, lists the common malfunctions which may occur. It
refers you to the proper page for troubleshooting procedures.
c.
This manual cannot list all possible malfunctions that may occur, all tests or inspections that must be
performed, or all corrective actions for each malfunction. If a malfunction is not listed, or is not remedied by corrective
actions, notify personnel at next highest maintenance level.
d.
Prior to using troubleshooting diagrams, be sure you have performed all normal operational checks. Refer to
the electrical schematic (Figure FO-2) and hydraulic flow diagram (Figure FO-1) to assist in troubleshooting.
e.
Never overlook the chance that the problem could be of simple origin. The problem may be corrected with
minor adjustments.
f.
Use all senses to observe and locate troubles. Use test instruments or gauges to help isolate problems.
Always isolate the system where the trouble occurs, then locate the defective component.
g.
When troubleshooting a malfunction:
(1)
Question the operator to obtain any information that might help determine the cause of the malfunction.
Before continuing, ensure that all applicable operator troubleshooting has been performed.
(2)
Locate the symptom or symptoms in Table 2-2 that best describe the malfunction. If the appropriate
symptom is not listed, notify your supervisor.
(3)
Turn to the page where the troubleshooting procedures for that malfunction are described.
(4)
Perform each step in order until the malfunction is corrected. Do not perform any maintenance task
unless the table directs you to do so.
2-9
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