Hyundai Excavator R450LC-7. Service and repair manual - page 18

SECTION 6 TROUBLESHOOTING

Group 1 Before Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-1

Group 2 Hydraulic and Mechanical System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-4

Group 3 Electrical System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-24

Group 4 Mechatronics System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-40

6-1

SECTION 6 TROUBLESHOOTING

GROUP 1 BEFORE TROUBLESHOOTING

1. INTRODUCTION

When a trouble is occurred in the machine, this section will help an operator to maintain the machine
with easy.
The trouble of machine is parted Hydraulic & Mechanical system, Electrical system and Mechatronics
system. At each system part, an operator can check the machine according to the troubleshooting
process diagram.

If fault codes (2 or 3 digits) are displayed on the monitor, please contact Hyundai or
Cummins.

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6-2

STEP 1. Study the machine system

Study and know how the machine is operating,
how the system is composing, what kinds of
function are installed in the machine and what
are specifications of the system components by
the machine service manual.
Especially, deepen the knowledge for the related
parts of the trouble.

STEP 2. Ask the operator

Before inspecting, get the full story of
malfunctions from a witness --- the
operator.

How the machine is used and when it is
serviced?

When the trouble was noticed and what
work the machine was doing at that time?

What is the phenomenon of the trouble?
Was the trouble getting worse, or did it
come out suddenly for the first time?

Did the machine have any troubles
previously? If so, which parts were repaired
before.

STEP 3. Inspect the machine

Before starting troubleshooting, check the
machine for the daily maintenance points as
shown in the operator's manual.

And also check the electrical system including
batteries, as the troubles in the electrical system
such as low battery voltage, loose connections
and blown out fuses will result in malfunction of
the controllers causing total operational failures
of the machine.

2. DIAGNOSING PROCEDURE

To carry out troubleshooting efficiently, the following steps must be observed.

ON THE

INSPECTION

13031SH02

13031SH03

6-2(3) 210-7

6-3

STEP 4. Inspect the trouble actually on the

machine

In case that some trouble cannot be confirmed,
obtain the details of the malfunction from the
operator.
Also, check if there are any in complete
connections of the wire harnesses are or not.

STEP 5. Perform troubleshooting

According to where the trouble parts are
located, hydraulic & mechanical system part or
electrical system part or mechatronics system
part, perform troubleshooting the machine refer
to the each system part's troubleshooting
process diagram.

STEP 6. Trace a cause

Before reaching a conclusion, check the most
suspectible causes again. Try to trace what the
real cause of the trouble is.

Make a plan of the appropriate repairing
procedure to avoid consequential malfunctions.

6-3(1) 210-7

13031SH05

6-3(3) 210-7

6-4

GROUP 2 HYDRAULIC AND MECHANICAL SYSTEM

1. INTRODUCTION

MACHINE IN GENERAL

If even a minor fault is left intact and operation is continued, a fatal failure may be caused, entailing
a large sum of expenses and long hours of restoration.
Therefore when even a small trouble occurs, do not rely on your intuition and experience, but look
for the cause based on the troubleshooting principle and perform maintenance and adjustment to
prevent major failure from occurring. Keep in mind that a fault results from a combination of
different causes.

The following lists up commonly occurring faults and possible causes with this machine. For the
troubleshooting of the engine, refer to the coming troubleshooting and repair.

When carrying out troubleshooting, do not hurry to disassemble the components.
It will become impossible to find the cause of the problem.

Ask user or operator the following.

Was there any strange thing about machine before failure occurred?
Under what conditions did the failure occur?
Have any repairs been carried out before the failure?

Check before troubleshooting.

Check oil and fuel level.
Check for any external leakage of oil from components.
Check for loose or damage of wiring and connections.

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