Hyundai Excavator R450LC-7. Service and repair manual - page 1

0-1

FOREWORD

1. STRUCTURE

This service manual has been prepared as an aid to improve the quality of repairs by giving the
serviceman an accurate understanding of the product and by showing him the correct way to perform
repairs and make judgements. Make sure you understand the contents of this manual and use it to
full effect at every opportunity.
This service manual mainly contains the necessary technical information for operations performed in
a service workshop.
For ease of understanding, the manual is divided into the following sections.

SECTION 1 GENERAL
This section explains the safety hints and gives the specification of the machine and major
components.

SECTION 2 STRUCTURE AND FUNCTION
This section explains the structure and function of each component. It serves not only to give an
understanding of the structure, but also serves as reference material for troubleshooting.

SECTION 3 HYDRAULIC SYSTEM
This section explains the hydraulic circuit, single and combined operation.

SECTION 4 ELECTRICAL SYSTEM
This section explains the electrical circuit, monitoring system and each component. It serves not only
to give an understanding electrical system, but also serves as reference material for trouble shooting.

SECTION 5 MECHATRONICS SYSTEM
This section explains the computer aided power optimization system and each component.

SECTION 6 TROUBLESHOOTING
This section explains the troubleshooting charts correlating problems to causes.

SECTION 7 MAINTENANCE STANDARD
This section gives the judgement standards when inspecting disassembled parts.

SECTION 8 DISASSEMBLY AND ASSEMBLY
This section explains the order to be followed when removing, installing, disassembling or assembling
each component, as well as precautions to be taken for these operations.

SECTION 9 COMPONENT MOUNTING TORQUE
This section shows bolt specifications and standard torque values needed when mounting
components to the machine.

The specifications contained in this shop manual are subject to change at any time and without any
advance notice. Contact your HYUNDAI distributor for the latest information.

0-2

Revised edition mark(

①②③…

)

When a manual is revised, an edition mark is
recorded on the bottom outside corner of the
pages.

evisions

Revised pages are shown at the list of revised
pages on the between the contents page and
section 1 page.

Symbols
So that the shop manual can be of ample
practical use, important places for safety and
quality are marked with the following symbols.

2. HOW TO READ THE SERVICE MANUAL

Distribution and updating
Any additions, amendments or other changes will
be sent to HYUNDAI distributors.
Get the most up-to-date information before you
start any work.

Filing method

See the page number on the bottom of the
page.
File the pages in correct order.
Following examples shows how to read the
page number.
Example 1
2 - 3

Item number(2. Structure and
Function)
Consecutive page number for
each item.

Additional pages : Additional pages are
indicated by a hyphen(-) and number after the
page number. File as in the example.

Symbol

Item

Remarks

Special safety precautions are
necessary when performing the
work.

Extra special safety precautions
are necessary when performing
the work because it is under
internal pressure.

Special technical precautions or
other precautions for preserving
standards are necessary when
performing the work.

Safety

Caution

※

10 - 4

10 - 4 - 1

10 - 4 - 2

10 - 5

Added pages

0-3

3. CONVERSION TABLE

Method of using the Conversion Table
The Conversion Table in this section is provided to enable simple conversion of figures. For details of
the method of using the Conversion Table, see the example given below.

Example

Method of using the Conversion Table to convert from millimeters to inches
Convert 55mm into inches.

Locate the number 50in the vertical column at the left side, take this as

ⓐ

, then draw a

horizontal line from

ⓐ

Locate the number 5in the row across the top, take this as

ⓑ

, then draw a perpendicular line

down from

ⓑ

Take the point where the two lines cross as

ⓒ

. This point

ⓒ

gives the value when converting

from millimeters to inches. Therefore, 55mm = 2.165 inches.

Convert 550mm into inches.

The number 550 does not appear in the table, so divide by 10(Move the decimal point one place
to the left) to convert it to 55mm.

Carry out the same procedure as above to convert 55mm to 2.165 inches.

The original value(550mm) was divided by 10, so multiply 2.165 inches by 10(Move the decimal
point one place to the right) to return to the original value.
This gives 550mm = 21.65 inches.

(1)

(2)

(3)

(1)

(2)

(3)

CONTENTS

SECTION 1 GENERAL

Group 1 Safety Hints - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1

Group 2 Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-9

SECTION 2 STRUCTURE AND FUNCTION

Group 1 Pump Device - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1

Group 2 Main Control Valve - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-21

Group 3 Swing Device - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-46

Group 4 Travel Device - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-57

Group 5 RCV Lever - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-64

Group 6 RCV Pedal - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-71

SECTION 3 HYDRAULIC SYSTEM

Group 1 Hydraulic Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1

Group 2 Main Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-2

Group 3 Pilot Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-5

Group 4 Single Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-13

Group 5 Combined Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-23

SECTION 4 ELECTRICAL SYSTEM

Group 1 Component Location - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1

Group 2 Electrical Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-3

Group 3 Electrical Component Specification - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-20

Group 4 Connectors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-28

SECTION 5 MECHATRONICS SYSTEM

Group 1 Outline - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1

Group 2 Mode Selection System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-3

Group 3 Automatic Deceleration System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-6

Group 4 Power Boost System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-7

Group 5 Travel Speed Control System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-8

Group 6 Automatic Warming Up Function - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-9

Group 7 Engine Overheat Prevention Function - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-10

Group 8 Anti-Restart System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-11

Group 9 Self-Diagnostic System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-12

Group 10 Engine Control System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-19

Group 11 EPPR(Electro Proportional Pressure Reducing) Valve - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-21

Group 12 Monitoring System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-24

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

SECTION 7 MAINTENANCE STANDARD

Group 1 Operational Performance Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-1

Group 2 Major Components - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-21

Group 3 Track and Work Equipment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-28

SECTION 8 DISASSEMBLY AND ASSEMBLY

Group 1 Precaution - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-1

Group 2 Tightening Torque - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-4

Group 3 Pump Device - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-7

Group 4 Main Control Valve - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-36

Group 5 Swing Device - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-49

Group 6 Travel Device - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-74

Group 7 RCV Lever - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-114

Group 8 Turning Joint - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-128

Group 9 Boom, Arm and Bucket Cylinder - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-133

Group 10 Undercarriage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-150

Group 11 Work Equipment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-162

SECTION 9 COMPONENT MOUNTING TORQUE

Group 1 Introduction Guide - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9-1

Group 2 Engine System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9-2

Group 3 Electric System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9-4

Group 4 Hydraulic System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9-6

Group 5 Undercarriage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9-9

Group 6 Structure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9-10

Group 7 Work Equipment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9-14

SECTION 1 GENERAL

FOLLOW SAFE PROCEDURE

Unsafe work practices are dangerous.
Understand service procedure before doing
work; Do not attempt shortcuts.

WEAR PROTECTIVE CLOTHING

Wear close fitting clothing and safety equipment
appropriate to the job.

WARN OTHERS OF SERVICE WORK

Unexpected machine movement can cause
serious injury.
Before performing any work on the excavator,
attach a

「

o Not Operate

」

tag on the right side

control lever.

USE HANDHOLDS AND STEPS

Falling is one of the major causes of personal
injury.
When you get on and off the machine, always
maintain a three point contact with the steps and
handrails and face the machine. Do not use any
controls as handholds.
Never jump on or off the machine. Never mount
or dismount a moving machine.
Be careful of slippery conditions on platforms,
steps, and handrails when leaving the machine.

SECTION 1 GENERAL

GROUP 1 SAFETY

1-1

13031GE01

13031GE02

13031GE03

PREPARE FOR EMERGENCIES

Be prepared if a fire starts.

Keep a first aid kit and fire extinguisher handy.

Keep emergency numbers for doctors,
ambulance service, hospital, and fire
department near your telephone.

PROTECT AGAINST FLYING DEBRIS

Guard against injury from flying pieces of metal
or debris; Wear goggles or safety glasses.

PROTECT AGAINST NOISE

Prolonged exposure to loud noise can cause
impairment or loss of hearing.

Wear a suitable hearing protective device such
as earmuffs or earplugs to protect against
objectionable or uncomfortable loud noises.

AVOID POWER LINES

Serious injury or death can result from contact
with electric lines.

Never move any part of the machine or load
closer to electric line than 3m(10ft) plus twice the
line insulator length.

1-2

13031GE04

13031GE05

13031GE06

13031GE07

KEEP RIDERS OFF EXCAVATOR

Only allow the operator on the excavator. Keep
riders off.

Riders on excavator are subject to injury such
as being struck by foreign objects and being
thrown off the excavator. Riders also obstruct
the operator's view resulting in the excavator
being operated in an unsafe manner.

MOVE AND OPERATE MACHINE SAFELY

Bystanders can be run over. Know the location
of bystanders before moving, swinging, or
operating the machine.

Always keep the travel alarm in working
condition. It warns people when the excavator
starts to move.

Use a signal person when moving, swinging, or
operating the machine in congested areas.
Coordinate hand signals before starting the
excavator.

OPERATE ONLY FORM OPERATOR'S SEAT

Avoid possible injury machine damage. Do not
start engine by shorting across starter terminals.

NEVER start engine while standing on ground.
Start engine only from operator's seat.

PARK MACHINE SAFELY

Before working on the machine:

Park machine on a level surface.

Lower bucket to the ground.

Turn auto idle switch off.

Run engine at 1/2 speed without load for 2 minutes.

Turn key switch to OFF to stop engine.
Remove key from switch.

Move pilot control shutoff lever to locked position.

Allow engine to cool.

1-3

13031GE08

13031GE09

13031GE26

SUPPORT MACHINE PROPERLY

Always lower the attachment or implement to
the ground before you work on the machine. If
you must work on a lifted machine or
attachment, securely support the machine or
attachment.

Do not support the machine on cinder blocks,
hollow tiles, or props that may crumble under
continuous load.
Do not work under a machine that is supported
solely by a jack. Follow recommended
procedures in this manual.

SERVICE COOLING SYSTEM SAFELY

Explosive release of fluids from pressurized
cooling system can cause serious burns.

Shut off engine. Only remove filler cap when
cool enough to touch with bare hands.

HANDLE FLUIDS SAFELY-AVOID FIRES

Handle fuel with care; It is highly flammable.
Do not refuel the machine while smoking or
when near open flame or sparks. Always stop
engine before refueling machine.
Fill fuel tank outdoors.

Store flammable fluids away from fire hazards.
Do not incinerate or puncture pressurized
containers.

Make sure machine is clean of trash, grease,
and debris.

Do not store oily rags; They can ignite and burn
spontaneously.

1-4

13031GE10

13031GE11

13031GE12

13031GE13

BEWARE OF EXHAUST FUMES

Prevent asphyxiation. Engine exhaust fumes
can cause sickness or death.

If you must operate in a building, be positive
there is adequate ventilation. Either use an
exhaust pipe extension to remove the exhaust
fumes or open doors and windows to bring
enough outside air into the area.

REMOVE PAINT BEFORE WELDING OR
HEATING

Avoid potentially toxic fumes and dust.

Hazardous fumes can be generated when paint
is heated by welding, soldering, or using a torch.

Do all work outside or in a well ventilated area.
Dispose of paint and solvent properly.

Remove paint before welding or heating:

If you sand or grind paint, avoid breathing the dust.

Wear an approved respirator.

If you use solvent or paint stripper, remove

stripper with soap and water before welding.
Remove solvent or paint stripper containers
and other flammable material from area.
Allow fumes to disperse at least 15 minutes
before welding or heating.

LLUMINATE WORK AREA SAFELY

Illuminate your work area adequately but safely.
Use a portable safety light for working inside or
under the machine. Make sure the bulb is
enclosed by a wire cage. The hot filament of an
accidentally broken bulb can ignite spilled fuel or
oil.

1-5

13031GE14

13031GE15

Content .. 1 2 ..

///////////////////////////////////////