This “Troubleshooting” section describes the fault diagnosis and corrective actions mainly for hydraulic systems. The cause
of the problem can be investigated by following the arrows in the chart shown at the beginning of each item.
Notes on troubleshooting and servicing
1. Do not disassemble the faulty part without first investigating the following.
a. Ask the user the following questions.
• The situation when the fault occurred.
• Any abnormalities or changes before the fault occurred.
• Any faulty parts other than the part in question.
• Any identical failure in the past
b. Drive the machine yourself and confirm the faulty condition.
• Determine if it is really faulty by referring to the performance criteria. Note that such determination may differ de-
pending on the person.
Important: By operating the user’s machine, you could make a bad situation worse. Therefore, before driving the
machine, always ask the user’
s permission to do so.
c. Determine the cause of trouble based on the information obtained from the user and by driving the machine yourself.
Also remember that once the machine has been disassembled, it is almost impossible to reproduce the conditions
of the trouble, and so there will be no second chance to find out the true cause. Therefore be sure to find the true
cause of the trouble before attempting disassembly.
2. When multiple causes are suspected, start with the simplest one.
3. Think why the trouble occurred and try to correct the root cause of the problem.
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