Komatsu PC210LC-6K Manual

Unsafe use of this machine may cause serious injury or
death. Operators and maintenance personnel must read this
manual before operating or maintaining this machine. This
manual should be kept inside the cab for reference and
periodically reviewed by all personel who will come into
contact with the machine.
EEAM006003
Operation &
Maintenance Manual
PC210, PC210LC-6K
PC240LC, PC240NLC-6K
HYDRAULIC EXCAVATOR
SERIAL NUMBER PC210-6K - K32000 and up
PC210LC-6K - K32000 and up
PC240LC-6K - K32000 and up
PC240NLC-6K - K32000 and up
WARNING
© Komatsu Europe International
All Rights Reserved
Printed in Europe
3-2002
PC210, PC210LC-6K, PC240LC, PC240NLC-6K
EEAM006003

0-1
PC210/240-ENG
This manual provides rules and guidelines which will help you use this machine safely and effectively. Keep
this manual handy and have all personnel read it periodically. If this manual has been lost or has become dirty
and can not be read, request a replacement manual from Komatsu or your Komatsu distributor.
If you sell the machine, be sure to give this manual to the new owners.
Continuing improvements in the design of this machine can lead to changes in detail which may not be
reflected in this manual. Consult Komatsu or your Komatsu distributor for the latest available information for
your machine or for questions regarding information in this manual.
• This operation & maintenance manual may contain attachments and optional equipment that are
not available in your area. Please consult your local Komatsu distributor for those items you
require.
• This machine complies with EC directive (89/392/EEC ).
Machines complying with this directive display the CE mark
• Improper operation and maintenance of this machine can be hazardous and could result in
serious injury or death.
• Operators and maintenance personnel should read this manual thoroughly before beginning
operation or maintenance.
• Some actions involved in operation and maintenance of the machine can cause a serious acci-
dent, if they are not done in a manner described in this manual.
• The procedures and precautions given in this manual apply only to intended uses of the ma-
chine. If you use your machine for any unintended uses that are not specifically prohibited, you
must be sure that it is safe for you and others. In no event should you or others engage in
prohibited uses or actions as described in this manual.
• Komatsu delivers machines that comply with all applicable regulations and standards of the
country to which it has been shipped. If this machine has been purchased in another country or
purchased from someone in another country, it may lack certain safety devices and specifica-
tions that are necessary for use in your country. If there is any question about whether your
product complies with the applicable standards and regulations of your country, consult
Komatsu or your Komatsu distributor before operating the machine.
• The description of safety is given in SAFETY INFORMATION on page 0-2 and in SAFETY from
page 1-1.
WARNING
1. FOREWORD

0-2
PC210/240-ENG
2.1 SAFETY MESSAGES
Most accidents are caused by the failure to follow fundamental safety rules for the operation and mainte-
nance of machines.
To avoid accidents, read, understand and follow all precautions and warnings in this manual and on the
machine before performing operation and maintenance.
To identify hazards on the machine pictorial decals are used ( see POSITION FORATTACHING SAFETY
LABELS).
RED WARNING TRIANGLE - This is used on safety labels where there is a high probability
of serious injury or death if the hazard is not avoided. These
safety messages or labels usually describe precautions that
must be taken to avoid the hazard. Failure to avoid this hazard
may also result in serious damage to the machine.
ORANGE WARNING TRIANGLE - This is used on safety labels where there is a potentially
dangerous situation which could result in serious injury or
death if the hazard is not avoided. These safety messages or
labels usually describe precautions that must be taken to
avoid the hazard. Failure to avoid this hazard may also result
in serious damage of the machine
YELLOW SAFETY TRIANGLE - This is used on safety labels for hazards which could result in
minor or moderate injury if the hazard is not avoided. This
word might also be used for a hazard where the only result
could be damage to the machine.
NOTICE - This word is used for precautions that must be taken to avoid
actions which could shorten the life of the machine.
Safety precautions are described in SAFETY from page 1-1.
Komatsu cannot predict every circumstance that might involve a potential hazard in operation and mainte-
nance. Therefore the safety message in this manual and on the machine may not include all possible safety
precautions. If any procedures or actions not specifically recommended or allowed in this manual are used, you
must be sure that you and others can do such procedures and actions safely and without damaging the machine.
If you are unsure about the safety of some procedures, contact Komatsu or your Komatsu distributor.
2. SAFETY INFORMATION

0-3
PC210/240-ENG
2.2. NOISE
Operator ears noise value
(Sound pressure level)
Noise level indicated is the guaranteed value as specified in the directive 86/662/EEC,
as amended by 95/27/EEC
2.3. VIBRATION
• The weighted root mean square acceleration value to which the operator’s arms are subjected does not
exceed 2.5 m/s
• The weighted root mean square acceleration value to which the operator’s body is subjected does not
exceed 0.5 m/s
These results were obtained by accelerometers during trench digging.
2. SAFETY INFORMATION
Ambient noise value
(Sound power level)
95/27/EC 95/27/EC

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PC210/240-ENG
3.1 INTENDED USE
This Komatsu HYDRAULIC EXCAVATOR is designed to be used mainly for the following work:
• Digging
• Smoothing work
• Ditching work
• Loading work
See the section 12.14 “WORK POSSIBLE USING HYDRAULIC EXCAVATOR” for futher details
3.2 FEATURES
• This Komatsu HYDRAULIC EXCAVATOR is equipped with various controls based on an advanced
electronics system.
• The monitor panel greatly facilitates daily maintenance and self-diagnosis.
• Working mode, travel speed and swing priority are selectable.
• Digging and lifting force can be increased by light-touch control. (For details, see operation section.)
• Adjustable wrist control levers make operations smooth and easy.
• Fresh filtered air heater assures comfortable operation. (Air conditioner option)
• Low noise level and smart urban style design and colouring.
• Superb operation performance provided by powerful engine and high-performance hydraulic pumps.
• Low fuel consumption controlled by an electronic control system provides an environment-friendly
machine.
3.3 BREAKING IN YOUR NEW MACHINE
Your Komatsu machine has been thoroughly adjusted and tested before shipment.
However, operating the machine under severe conditions at the beginning can adversely affect the perform-
ance and shorten the machine life.
Be sure to break in the machine for the initial 100 hours (as indicated by the hour meter.)
During breaking in:
• Idle the engine for 5 minutes after starting it up.
• Avoid operation with heavy loads or at high speeds.
• Sudden starting or acceleration, unnecessarily abrupt braking and sharp turning should be avoided
except in cases of emergency.
Additionally for the first 20 hours
• Avoid operating engine for prolonged periods at constant speed (including idle.)
• Avoid high speed travelling for periods of more than 5 minutes.
Pay particular attention to oil pressure and temperature indicators & check coolant and oil levels frequently
during breaking in.
The precautions given in this manual for operating, maintenance, and safety procedures are only those that
apply when this product is used for the specified purpose. If the machine is used for a purpose that is not listed
in this manual, Komatsu cannot bear any responsibility for safety. All consideration of safety in such operations
is the responsibility of the user.
Operation that are prohibited in this manual must never carried out under any circumstances.
3. INTRODUCTION

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PC210/240-ENG
4.1 MACHINE SERIAL NO. PLATE POSITION
On the front bottom right of the operator’s cab
4.2 ENGINE SERIAL NO. PLATE POSITION
On the upper side of the engine cylinder head cover
4.3 TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
4. LOCATION OF PLATES, TABLE TO ENTER SERIAL
NO. AND DISTRIBUTOR
Machine serial No.:
Engine serial No.:
Manufacturers name: Komatsu UK Ltd
Address Durham Road
Birtley
Chester-Le-Street
County Durham DH32QX
United Kingdom
Distributor
Address Phone
z

0-6
PC210/240-ENG
4.4 MACHINE SERIAL PLATE.
MODEL
SERIAL No
MANUFACTURING YEAR
WEIGHT
ENGINE POWER
MANUFACTURER
Produced by Komatsu UK Ltd. for Komatsu Ltd, Tokyo, Japan.

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PC210/240-ENG
5. CONTENTS
1. Foreword............................................................................................................................................ 0-1
2. Safety information .............................................................................................................................. 0-2
3. Introduction ........................................................................................................................................ 0-4
4. Location of plates, table to enter serial No. and distributor................................................................ 0-5
SAFETY
6. General Precautions .......................................................................................................................... 1-2
7. Precautions during operation ............................................................................................................. 1-8
7.1 Before starting engine.................................................................................................................. 1-8
7.2 Operating machine..................................................................................................................... 1-10
7.3 Transportation ............................................................................................................................ 1-15
7.4 Battery........................................................................................................................................ 1-16
7.5 Towing ........................................................................................................................................ 1-17
7.6 Bucket with hook........................................................................................................................ 1-18
8. Precautions for maintenance ........................................................................................................... 1-21
8.1 Before carrying out maintenance ............................................................................................... 1-21
8.2 During maintenance................................................................................................................... 1-24
9. Position for attaching safety labels .................................................................................................. 1-28
OPERATION
10. General view
10.1 General view of machine .......................................................................................................... 2-2
10.2 General view of controls and gauges........................................................................................ 2-3
11. Explanation of components
11.1 Machine monitor....................................................................................................................... 2-4
11.2 Meter ...................................................................................................................................... 2-15
11.3 switches ................................................................................................................................. 2-16
11.4 Control levers, pedals ............................................................................................................ 2-20
11.5 Ceiling window ....................................................................................................................... 2-25
11.6 Front window.......................................................................................................................... 2-26
11.7 Door lock ................................................................................................................................ 2-28
11.8 Cap, cover with lock ............................................................................................................... 2-29
11.9 Luggage box .......................................................................................................................... 2-30
11.10 Ashtray ................................................................................................................................... 2-30
11.11 Heater..................................................................................................................................... 2-30
11.12 Air conditioner ........................................................................................................................ 2-31
11.13 Car radio ................................................................................................................................ 2-34
11.14 Fuse ....................................................................................................................................... 2-35
11.15 Fusible link ............................................................................................................................. 2-36
11.16 Controllers.............................................................................................................................. 2-36
11.17 Tool box .................................................................................................................................. 2-36
11.18 Refuelling pump ..................................................................................................................... 2-36
11.19 Handling the accumulator ...................................................................................................... 2-37

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PC210/240-ENG
12. Operation
12.1 Check before starting engine ................................................................................................. 2-39
12.2 Starting engine....................................................................................................................... 2-49
12.3 Operations and checks after starting engine ......................................................................... 2-52
12.4 Moving machine off................................................................................................................ 2-58
12.5 Steering machine ................................................................................................................... 2-61
12.6 Stopping machine .................................................................................................................. 2-63
12.7 Swinging ................................................................................................................................ 2-64
12.8 Operation of work equipment................................................................................................. 2-65
12.9 Handling active mode ............................................................................................................. 2-66
12.10 Working mode selection....................................................................................................... 2-68
12.11 Prohibitions for operation ...................................................................................................... 2-70
12.12 Precaution for operation........................................................................................................ 2-72
12.13 Precaution when travelling up or down hills.......................................................................... 2-73
12.14 How to escape from mud ...................................................................................................... 2-75
12.15 Work possible using hydraulic excavator.............................................................................. 2-76
12.16 Replacement and inversion of bucket................................................................................... 2-77
12.17 Parking the machine ............................................................................................................. 2-79
12.18 Check after finishing work...................................................................................................... 2-80
12.19 Stopping engine ..................................................................................................................... 2-81
12.20 Check after stopping engine .................................................................................................. 2-82
12.21 Locking................................................................................................................................... 2-82
12.22 Overload warning device ....................................................................................................... 2-82
13 Transportation
13.1 Loading, unloading work ......................................................................................................... 2-83
13.2 Precautions for loading ........................................................................................................... 2-85
13.3 Precautions for transportation................................................................................................. 2-86
13.4 Lifting the machine.................................................................................................................. 2-86
14. Cold weather operation
14.1 Precaution for low temperature............................................................................................... 2-87
14.2 Precautions after completion of work...................................................................................... 2-89
14.3 After cold weather ................................................................................................................... 2-89
15. Long-term storage
15.1 Before storage ........................................................................................................................ 2-90
15.2 During storage ........................................................................................................................ 2-91
15.3 After storage............................................................................................................................ 2-91
15.4 Starting machine after long-term storage................................................................................ 2-91
16. Troubleshooting
16.1 Phenomena that are not failures............................................................................................. 2-92
16.2 Method of towing machine ...................................................................................................... 2-92
16.3 Using method for light-weight towing hole .............................................................................. 2-92
16.4 Precautions on particular jobsites ........................................................................................... 2-93
16.5 If battery is discharged............................................................................................................ 2-93
16.6 Other trouble ........................................................................................................................... 2-97
5. CONTENTS

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PC210/240-ENG
MAINTENANCE
17. Guides to maintenance ...................................................................................................................... 3-2
18. Outlines of service ............................................................................................................................. 3-5
18.1 Outline of oil, fuel, coolant........................................................................................................ 3-5
18.2 Outline of electric system......................................................................................................... 3-9
18.3 Outline of hydraulic system.................................................................................................... 3-10
19. Wear parts list ...................................................................................................................................3-11
20. Use of fuel, coolant and lubricants according to ambient temperature ............................................ 3-12
21. Standard tightening torques for bolts and nuts ................................................................................ 3-17
21.1 Introduction of necessary tools ............................................................................................... 3-17
21.2 Torque list................................................................................................................................ 3-18
22. Periodic replacement of safety critical parts .................................................................................... 3-19
23. Maintenance schedule chart ............................................................................................................ 3-22
23.1 Maintenance schedule chart ................................................................................................... 3-22
23.2 Maintenance interval when using hydraulic breaker ............................................................... 3-24
24. Service procedure............................................................................................................................ 3-25
24.1 Initial 250 hours service .......................................................................................................... 3-25
24.2 When required ........................................................................................................................ 3-26
24.3 Check before staring............................................................................................................... 3-42
24.4 Every 100 hours service ......................................................................................................... 3-47
24.5 Every 250 hours service ......................................................................................................... 3-51
24.6 Every 500 hours service ......................................................................................................... 3-55
24.7 Every 1000 hours service ....................................................................................................... 3-61
24.8 Every 2000 hours service ....................................................................................................... 3-65
24.9 Every 4000 hours service ....................................................................................................... 3-68
24.10 Every 5000 hours service ...................................................................................................... 3-69
SPECIFICATIONS
25. MACHINE SPECIFICATIONS............................................................................................................ 4-2
25.1 Machine specifications.............................................................................................................. 4-2
25.2 Explanation of lifting capacity chart........................................................................................... 4-9
5. CONTENTS

0-10
PC210/240-ENG
OPTIONS AND ATTACHMENTS
26 General Precautions .......................................................................................................................... 5-2
26.1 General precautions related to safety ........................................................................................ 5-2
26.2 Precautions when installing attachments................................................................................... 5-3
27. Handling bucket with hook ................................................................................................................. 5-4
27.1 Checking for damage to bucket with hook ................................................................................. 5-4
27.2 Prohibited operations ................................................................................................................. 5-4
27.3 Precautions during operation ..................................................................................................... 5-4
28 Machine ready for attachments.......................................................................................................... 5-5
28.1 Explanation of components........................................................................................................ 5-5
28.2 Hydraulic circuit.......................................................................................................................... 5-7
28.3 Attachment mounting / dismounting procedure.......................................................................... 5-9
28.4 Operation ..................................................................................................................................5-11
28.5 Long-term storage.................................................................................................................... 5-12
28.6 Specifications........................................................................................................................... 5-12
28.7 First attachment with clam-shell option................................................................................. 5-12-1
28.8 First and second attachment................................................................................................. 5-12-2
29. Introduction of attachments.............................................................................................................. 5-13
29.1 Specification, use..................................................................................................................... 5-13
29.2 Attachment installing combination table................................................................................... 5-15
29.3 Selection of track shoes........................................................................................................... 5-17
29.4 Selection of bucket teeth.......................................................................................................... 5-18
29.5 Handling trapezoidal bucket..................................................................................................... 5-19
29.6 Handling extension arm ........................................................................................................... 5-20
29.7 Handling clamshell bucket ....................................................................................................... 5-21
30. Extending machine service lift........................................................................................................... 5-22
30.1 Hydraulic breaker..................................................................................................................... 5-22
30.2 Power ripper............................................................................................................................. 5-25
30.3 Fork grab.................................................................................................................................. 5-26
30.4 Grapple bucket......................................................................................................................... 5-27
30.5 Scrap grapple........................................................................................................................... 5-28
30.6 Crusher & cutter....................................................................................................................... 5-29
30.7 Hydraulic pile driver ................................................................................................................. 5-30
30.8 Hydraulic excavator with multi-purpose crane ......................................................................... 5-31
5. CONTENTS

1-1
PC210/240-ENG
SAFETY
WARNING
Read and follow all safety precautions. Failure to do so may
result in serious injury or death.
This safety section also contains precautions for optional equipment
and attachments.

1-2
PC210/240-ENG
WARNING: For reasons of safety, al-
ways follow these safety precautions.
SAFETY RULES
• ONLY trained and authorised personnel can operate and maintain the machine.
• Follow all safety rules, precautions and instructions when operating or performing maintenance on the
machine.
• When working with another operator or a person on worksite traffic duty, be sure all personnel understand
all hand signals that are to be used.
SAFETY FEATURES
• Be sure all guards and covers are in their proper position. Have guards and covers repaired if damaged.
• Use safety features such as safety lock lever properly.
• NEVER remove any safety features. ALWAYS keep them in good operating condition.
Safety lever nSee 12.16 “PARKING THE MACHINE”.
• Improper use of safety features could result in serious bodily injury or death.
CLOTHING AND PERSONAL PROTECTIVE ITEMS
• Avoid loose clothing, jewellery, and loose long hair.They can catch on controls or in moving parts and cause
serious injury or death. Also, do not wear oily cloths because they are flammable.
• Wear a hard hat, safety glasses, safety shoes, mask or gloves when operating or maintaining the machine.
Always wear safety goggles, hard hat and heavy gloves if your job involves scattering metal chips or minute
materials <—> this is so particularly when driving pins with a hammer and when cleaning the air cleaner
element with compressed air.
Check also that there is no one near the machine.
Driving in pins, See n 12.15 “REPLACEMENT AND INVERSION OF BUCKET’.
Cleaning of air cleaner element, See n24.2 “WHEN REQUIRED” in service procedure.
6. GENERAL PRECAUTIONS

1-3
PC210/240-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
UNAUTHORISED MODIFICATION
• Any modification made without authorisation from Komatsu can create hazards.
• Before making a modification, consult your Komatsu distributor. Komatsu will not be responsible for any
injury or damage caused by any unauthorised modification.
ALWAYS APPLY LOCK WHEN LEAVING OPERATOR’S SEAT
• When standing up from the operator’s seat, always place the safety lock lever securely in the LOCK posi-
tion. If you accidentally touch the travel or swing lever when they are not locked, the work equipment may
suddenly move and cause serious injury or damage.
• When leaving the machine, lower the work equipment completely to the ground, set the safety lock lever to
the LOCK position, then stop the engine and use the key to lock all the equipment.Always take the key with
you. Work equipment posture See n12.16 “PARKING THE MACHINE.”
MOUNTING AND DISMOUNTING
• NEVER jump on or off the machine. NEVER get on or off a moving machine.
• When mounting or dismounting, always face the machine and use the handrails, machine or track frame
steps, and track shoes.
• Do not hold any control levers when getting on or off the machine.
• Ensure safety by always maintaining at least three-point contact of hands and feet with the handrails, steps
or track shoes.
• Always remove any oil or mud from the handrails, steps and track shoes. If they are damaged, repair them
and tighten any loose bolts.
• If grasping the door handrail when mounting or dismounting or moving on the track, open and lock the door
securely in the open position. Otherwise, the door may move suddenly, causing you to lose balance and fall.
6. GENERAL PRECAUTIONS

1-4
PC210/240-ENG
WARNING: For reasons of safety, al-
ways follow these safety precautions.
FIRE PREVENTION FOR FUEL AND OIL
Fuel, oil, and antifreeze can be ignited by a flame. Fuel is particularly FLAMMABLE and can be HAZARD-
OUS.
• Keep flames away from flammable fluids.
• Stop the engine and do not smoke when refuelling.
• Tighten all fuel and oil caps securely.
• Refuelling and oiling should be carried out in well ventilated areas.
• Keep oil and fuel in a secure place and do not allow unauthorised persons to enter.
PRECAUTIONS WHEN HANDLING AT HIGH TEMPERATURES
• Immediately after operations are stopped, the engine coolant, engine oil, and hydraulic oil are at high
temperatures, and are still under pressure. Attempting to remove the cap, drain the oil or water, or
replace the filters may lead to serious burns.Always wait for the temperature to go down, and follow the
specified procedures when carrying out these operations.
• To prevent hot water from spurting out:
1) Turn engine off.
2)Allow water to cool.
3) Slowly loosen cap to relieve pressure before removing.
• To prevent hot oil from spurting out:
1) Turn engine off.
2)Allow oil to cool.
3) Slowly loosen cap to relieve pressure before removing.
6. GENERAL PRECAUTIONS

1-5
PC210/240-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
ASBESTOS DUST HAZARD PREVENTION
Asbestos dust can be HAZARDOUS to your health if it is inhaled.
Your Komatsu machine and genuine Komatsu spare parts do not contain any asbestos. Use only genuine
Komatsu spare parts. If spare parts containing asbestos are used, the following precautions must be observed:
• NEVER use compressed air for cleaning.
• Use water for cleaning to keep down the dust.
• Operate the machine with the wind to your back, whenever possible.
• Use an approved respirator if necessary.
CRUSHING OR CUTTING PREVENTION
• Donot enter, or putyour handorarm orany otherpart ofyour bodybetweenmovable partssuch asbetween
the work equipment and cylinders, or between the machine and work equipment.
If the work equipment is operated, the clearance will change and this may lead to serious damage or per-
sonal injury.
FIRE EXTINGUISHER AND FIRST AID KIT
• Know how to use fire extinguisher (if installed).
• Provide a first aid kit at the storage point.
• Know what to do in the event of a fire.
• Be sure you know the phone numbers of persons you should contact in case of an emergency.
6. GENERAL PRECAUTIONS

1-6
PC210/240-ENG
WARNING: For reasons of safety, al-
ways follow these safety precautions.
PROTECTION AGAINST FALLING OR FLYING OBJECTS
If there is any danger of falling or flying objects hitting the operator, install protective guards in place to
protect the operator as required for each particular situation.
• For work with breakers, install a front guard on the windshield.Also, place a laminate coating sheet over the
windshield.
• For demolition or shear work, install a front guard on the windshield and a top guard on the cab.Also, place
a laminate coating sheet over the windshield.
• For work in mines, quarries, demolition, tunnels or other places where there is danger of falling rocks, put
FOPS (falling object protective structure) in place.Also, place a laminate coating sheet over the windshield.
The above comments are made with regards to typical working conditions. By all means you should put on
other guards if required by conditions at your particular site.
For details of safety guards, please contact your Komatsu distributor.
Also, even for other types of work, if there is any danger of being hit by falling or flying objects or of objects
entering the operator’s cab, select and install a guard that matches the working conditions.
Be sure to close the front window before commencing work.
When carrying out the above operations, make sure to keep all persons other than the operator outside the
range of falling or flying objects. Be particularly sure to maintain a proper distance when carrying out shear
operations.
Level 1 acceptance is intended for protection from small falling rocks, flying objects and other debis encoun-
tered in operations such as highway maintenance, landscaping and light construction site services.
Level 1 Guards Fitted directly onto the roof and front of the cab.
Level 2 acceptance is intended for protection from large falling rocks, flying objects and other debris encoun-
tered in applications such as demolition work, building construction and general heavy site work.
Level 2 Guards Fops fitted directly to the revolving frame.
Front guard fitted directly to front of fops.
Note: The above guards are the minimum required for typical working conditions as described above and are
in accordance with the lastest requirements of ISO/ DIS 10262 (draft standard).
6. GENERAL PRECAUTIONS

1-7
PC210/240-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident. 6. GENERAL PRECAUTIONS
• When exit by normal means is prevented in an emer-
gency you can get out through the emergency exit
(rear window).
• Pull the ring at the bottom of the window and remove
strip. This will allow you to push out glass.
• When the machine is operated on or beside a road, a rotating
beacon is required to avoid a traffic accident.
• Contact your Komatsu distributor to install beacon lamp.
ROTATING BEACON (OPTION)
PRECAUTIONS FOR ATTACHMENTS
• When installing and using an optional attachment, read the instruction manual for the attachment and the
information related to attachments in this manual.
• Do not use attachments that are not authorised by Komatsu or your Komatsu distributor. Use of unauthor-
ised attachments could create a safety problem and adversely affect the proper operation and useful life of
the machine.
• Any injuries, accidents, product failures resulting from the use of unauthorised attachments will not be the
responsibility of Komatsu.
MACHINES WITH ACCUMULATOR
On machines equipped with an accumulator, for a short time after the engine is stopped, the work equip-
ment will lower under its own weight when the work equipment control lever is shifted to LOWER. After the
engine is stopped, set the safety lock lever to the lock position (and also lock the attachment pedal with the
lock pin).
When releasing the pressure inside the work equipment circuit on machines equipped with an accumulator,
follow the procedure given in the inspection and maintenance section.
Method of releasing pressure nSee 11.19 “HANDLING THE ACCUMULATOR’’.
The accumulator is filled with high-pressure nitrogen gas, and it is extremely dangerous if it is handled in the
wrong way. Always observe the following precautions.
• Never make any hole in the accumulator or expose it to flame or fire.
• Do not weld anything to the accumulator.
• When carrying out disassembly or maintenance of the accumulator, or when disposing of the accumulator,
it is necessary to release the gas from the accumulator. A special air bleed valve is necessary for this
operation, so please contact your Komatsu distributor.
Gas in accumulator nSee 11.19 “HANDLING THEACCUMULATOR’’.
EMERGENCY EXIT
When this machine is operating close to a source of high electromagnetic interference, such as a radar station,
some abnormal phenomena may be observed.
• The display on the monitor panel may behave erratically.
• The warning buzzer may sound.
These effects do not signify a malfunction and the machine will return to normal as soon as the source of
interference is removed
ELECTROMAGNETIC INTERFERENCE

1-8
PC210/240-ENG
7. PRECAUTIONS DURING OPERATION
7.1 BEFORE STARTING ENGINE
SAFETY AT WORKSITE
• Before starting the engine, thoroughly check the area for any unu-
sual conditions that could be dangerous.
• Before starting the engine, examine the terrain and soil conditions
of the worksite. Determine the best and safest method of operation.
• Make the slope as horizontal as possible before continuing opera-
tions.
• If you need to operate on a street, protect pedestrians and cars by
designating a person for worksite traffic duty or by installing fences
around the worksite.
• If water lines, gas lines, and high-voltage electrical lines may be
buried under the worksite, contact each utility and identify their lo-
cations. Be careful not to sever or cut any of these lines.
• Check the depth and flow of water before operating in water or
crossing a river. NEVER be in water which is in excess of the per-
missible water depth.
Permissible water depth
See n12.11 “PRECAUTIONS FOR OPERATION.”
FIRE PREVENTION
• Thoroughly remove wood chips, leaves, paper and other flamma-
ble things accumulated on the engine compartment. They could
cause a fire.
• Check fuel, lubrication, and hydraulic systems for leaks. Have any
leaks repaired. Wipe up any excess oil, fuel or other flammable
fluids.
Check point nSee 12.1.1 “WALK-AROUND CHECK.”
• Be sure a fire extinguisher is present and working.
IN OPERATOR’S CAB
• Do not leave tools or spare parts lying around in the operator’s
compartment. They may damage or break the control levers or
switches. Always put them in the tool box on the left side of the
machine.
• Keep the cab floor, controls, steps and handrails free of oil, grease,
snow, and excess dirt.