Equipment For Troubleshooting; Connections And Wiring; Section 4. Troubleshooting Procedures; General - Hobart Jet-Ex 5D Operation And Maintenance Manual

OM-2094 / Operation and Maintenance Manual
Jet-Ex 5D / Series 500285 / Generator Set

Section 4. Troubleshooting Procedures

General

1.
Troubleshooting is an orderly process of checking and eliminating possible causes of trouble until the
exact cause of a trouble is found. As a rule, the best place to start looking for the cause of a trouble in a
circuit is at the source of power. Continue testing and checking the circuit, step-by-step, in an orderly
manner, until the cause of trouble is located. Reference connection and schematic diagrams.

Troubleshooting Chart

2.
a. Description
The troubleshooting chart lists information under three headings:
(1) Trouble, Symptom, and Condition,
(2) Probable Cause
(3) Test, Check, and Remedy
b. Use of the Troubleshooting Chart
Read the trouble symptoms and conditions before proceeding to causes and remedies.
For example:
At the beginning of the troubleshooting chart under ENGINE, the first trouble listed is: "Engine
will not start. Starter will NOT crank engine."
If the starter WILL crank the engine, then obviously this is not your symptom and condition. Go to
the next "Trouble, Symptom, and Condition" directly below. If the starter will NOT crank the engine,
look to the right under "Probable Cause" and "Test, Check, and Remedy" to find the various things
which could cause the trouble and what to do to check and remedy them.

Equipment for Troubleshooting

3.
A good quality, multi-scale voltmeter is the only instrument required similar clips, will be required. The
12 volt engine electrical system may be used for a 12 volt DC power source.

Safety Precautions

4.
WARNING

Diagrams

5.
A schematic/connection diagram of the generator set is provided in Chapter 5. This diagram can be
very helpful in troubleshooting. Components shown in the diagram are identified by reference
designators (or item names in some instances). A legend appearing on the diagram identifies each
reference designator by its full item name. For example, the symbol K403 identifies the overvoltage
relay, and M406 identifies the voltmeter.

Connections and Wiring

6.
Before condemning any electrical component, check all connections and wiring which could affect its
operation. In many instances a component may be non-functional simply because it is not receiving
power because of a loose connection or a poor ground. In most cases throughout the troubleshooting
chart, it will be assumed that connections and wiring have been checked.
November 1, 2000
Revised 07/01
Loose garments, neckties, and other hanging items must not be worn by
personnel near the fan or other exposed moving parts of this equipment while it
is running. Also, avoid contact with live electrical parts. death or serious injury
could result!
Chapter 2-4
Page 1