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.
EEAM008000
Operation &
Maintenance Manual
PC340-6K
PC340LC-6K
PC340NLC-6K
HYDRAULIC EXCAVATOR
SERIAL NUMBERS PC340-6K - K30001
PC340LC-6K - K30001 AND UP
PC340NLC-6K - K30001
WARNING
1. FOREWORD
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.
WARNING
• 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 accident, 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 machine. 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 specifications 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.
PC340-ENG
0-1
2. SAFETY INFORMATION
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 FOR ATTACHING 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 maintenance. 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.
0-2
PC340-ENG
2.2. NOISE
2. SAFETY INFORMATION
Operator ears noise value
(Sound pressure level)
Noise level indicated is the guaranteed value as specified in the directive 86/662/EEC
Ambient noise value
(Sound power level)
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.
PC340-ENG
0-3
3. INTRODUCTION
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
Y our 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.
Operations that are prohibited in this manual must never be carried out under any circumstances.
0-4
PC340-ENG
4. LOCATION OF PLATES, TABLE TO ENTER SERIAL
NO. AND DISTRIBUTOR
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 gear case front corner.
4.3 TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
Machine serial No.:
Engine serial No.:
Manufactureres name: Komatsu UK Ltd
Address Durham Road
Birtley
Chester-Le-Street
County Durham DH32QX
United Kingdom
Distributor
Address Phone
PC340-ENG
0-5
4.4 MACHINE SERIAL PLATE.
MODEL
SERIAL No
WEIGHT
ENGINE POWER
MANUFACTURER
Produced by Komatsu UK Ltd. for Komatsu Ltd, Tokyo, Japan.
0-6
PC340-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 T owing ........................................................................................................................................ 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 Switches ................................................................................................................................. 2-15
11.3 Control levers, pedals.............................................................................................................2-19
11.4 Roof hatch.............................................................................................................................. 2-24
11.5 Front window .......................................................................................................................... 2-25
11.6 Door lock................................................................................................................................ 2-27
11.7 Cap, cover with lock................................................................................................................ 2-28
11.8 Luggage box........................................................................................................................... 2-29
11.9 Ashtray ................................................................................................................................... 2-29
11.10 Heater .................................................................................................................................... 2-29
11.11 Air conditioner ........................................................................................................................ 2-30
11.12 Car radio ................................................................................................................................ 2-33
11.13 Fuse ....................................................................................................................................... 2-34
11.14 Fusible link ............................................................................................................................. 2-35
11.15 Controllers.............................................................................................................................. 2-35
11.16 Tool box .................................................................................................................................. 2-35
11.17 Refuelling pump ..................................................................................................................... 2-35
11.18 Handling the accumulator ....................................................................................................... 2-36
PC340-ENG
0-7
5. CONTENTS
12. Operation
12.1 Check before starting engine...................................................................................................2-38
12.2 Starting engine ........................................................................................................................ 2-48
12.3 Operations and checks after starting engine ...........................................................................2-51
12.4 Moving machine off .................................................................................................................2-57
12.5 Steering machine .................................................................................................................... 2-60
12.6 Stopping machine.................................................................................................................... 2-62
12.7 Swinging..................................................................................................................................2-63
12.8 Operation of work equipment ..................................................................................................2-64
12.9 Working mode selection ..........................................................................................................2-65
12.10 Prohibitions for operation........................................................................................................2-67
12.11 Precaution for operation .........................................................................................................2-69
12.12 Precaution when travelling up or down hills............................................................................2-70
12.13 How to escape from mud........................................................................................................2-72
12.14 Work possible using hydraulic excavator ................................................................................2-73
12.15 Replacement and inversion of bucket.....................................................................................2-74
12.16 Parking the machine............................................................................................................... 2-76
12.17 Check after finishing work ......................................................................................................2-77
12.18 Stopping engine ..................................................................................................................... 2-78
12.19 Check after stopping engine...................................................................................................2-79
12.20 Locking................................................................................................................................... 2-79
12.21 Overload warning device ........................................................................................................2-79
13 T ransportation
13.1 Loading, unloading work .........................................................................................................2-80
13.2 Precautions for loading............................................................................................................2-82
13.3 Precautions for transportation .................................................................................................2-83
13.4 Lifting the machine ..................................................................................................................2-83
14. Cold weather operation
14.1 Precaution for low temperature................................................................................................2-85
14.2 Precautions after completion of work ......................................................................................2-86
14.3 After cold weather ...................................................................................................................2-86
15. Long-term storage
15.1 Before storage.........................................................................................................................2-87
15.2 During storage......................................................................................................................... 2-88
15.3 After storage............................................................................................................................ 2-88
15.4 Starting machine after long-term storage ................................................................................2-88
16. Troubleshooting
16.1 Phenomena that are not failures ............................................................................................. 2-89
16.2 Method of towing machine.......................................................................................................2-89
16.3 Using method for light-weight towing hole ...............................................................................2-89
16.4 Precautions on particular jobsites ...........................................................................................2-90
16.5 If battery is discharged ............................................................................................................ 2-90
16.6 Other trouble ........................................................................................................................... 2-94
0-8
PC340-ENG
5. CONTENTS
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 .................................................................................3-16
21.1 Introduction of necessary tools................................................................................................ 3-16
21.2 Torque list ................................................................................................................................ 3-17
22. Periodic replacement of safety critical parts ..................................................................................... 3-18
23. Maintenance schedule chart ............................................................................................................ 3-20
23.1 Maintenance schedule chart ...................................................................................................3-20
23.2 Maintenance interval when using hydraulic breaker ................................................................3-22
24. Service procedure ............................................................................................................................ 3-23
24.1 Initial 250 hours service........................................................................................................... 3-23
24.2 When required......................................................................................................................... 3-24
24.3 Check before starting .............................................................................................................. 3-45
24.4 Every 50 hours service............................................................................................................3-49
24.5 Every 100 hours service..........................................................................................................3-51
24.6 Every 250 hours service..........................................................................................................3-54
24.7 Every 500 hours service..........................................................................................................3-61
24.8 Every 1000 hours service........................................................................................................3-67
24.9 Every 2000 hours service........................................................................................................3-73
24.10 Every 4000 hours ................................................................................................................... 3-80
SPECIFICATIONS
25. SPECIFICATIONS.............................................................................................................................. 4-2
25.1 Machine specifications .............................................................................................................. 4-2
25.2 Explanation of lifting capacity chart ...........................................................................................4-5
PC340-ENG
0-9
5. CONTENTS
OPTIONS AND A TTACHMENTS
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
29. Introduction of attachments ..............................................................................................................5-13
29.1 Specification, use .....................................................................................................................5-13
29.2 Attachment installing combination table ...................................................................................5-14
29.3 Selection of track shoes ...........................................................................................................5-15
29.4 Selection of bucket teeth ..........................................................................................................5-16
29.5 Handling trapezoidal bucket ..................................................................................................... 5-17
29.6 Handling extension arm............................................................................................................ 5-18
30. Extending machine service life .......................................................................................................... 5-19
30.1 Hydraulic breaker ..................................................................................................................... 5-19
30.2 Power ripper .............................................................................................................................5-22
30.3 Fork grab .................................................................................................................................. 5-23
30.4 Grapple bucket ......................................................................................................................... 5-24
30.5 Scrap grapple ........................................................................................................................... 5-25
30.6 Crusher & cutter .......................................................................................................................5-26
30.7 Hydraulic pile driver ..................................................................................................................5-27
30.8 Hydraulic excavator with multi-purpose crane ..........................................................................5-28
0-10
PC340-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.
PC340-ENG
1-1
WARNING: For reasons of safety, al-
6. GENERAL PRECAUTIONS
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 n See 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 n 24.2 “WHEN REQUIRED” in service procedure.
1-2
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
6. GENERAL PRECAUTIONS
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 position. 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 n 12.16 “P ARKING 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.
PC340-ENG
1-3
WARNING: For reasons of safety, al-
6. GENERAL PRECAUTIONS
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 HAZARDOUS.
• 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.
1-4
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
6. GENERAL PRECAUTIONS
ASBESTOS DUST HAZARD PREVENTION
Asbestos dust can be HAZARDOUS to your health if it is inhaled.
Y our 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
• Do not enter, or put your hand or arm or any other part of your body between movable parts such as between
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 personal 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.
PC340-ENG
1-5
WARNING: For reasons of safety, al-
6. GENERAL PRECAUTIONS
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.
FOPS
Front guard
Head guard
Front guard
1-6
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
6. GENERAL PRECAUTIONS
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 unauthorised 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 ACCUMULA TOR
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 n See 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 n See 11.19 “HANDLING THE ACCUMULATOR’’.
EMERGENCY EXIT
• When exit by normal means is prevented in an emergency 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.
ROT A TING BEACON (OPTION)
• 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.
ELECTROMAGNETIC INTERFERENCE
When tis 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.
• Th ewarning buzzer may sound.
These effects do not signify a mlfunction and the machine will return to normal as soon as the source of
interference is removed.
PC340-ENG
1-7
7. PRECAUTIONS DURING OPERATION
7.1 BEFORE STARTING ENGINE
SAFETY AT WORKSITE
• Before starting the engine, thoroughly check the area for any unusual 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 operations.
• 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 locations. 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 permissible water depth.
Permissible water depth
See n 12.11 “PRECAUTIONS FOR OPERATION.”
FIRE PREVENTION
• Thoroughly remove wood chips, leaves, paper and other flammable 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 n See 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.
1-8
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
7. PRECAUTIONS DURING OPERATION
VENTILATION FOR ENCLOSED AREAS
• If it is necessary to start the engine within an enclosed area, provide adequate ventilation. Exhaust fumes
from the engine can KILL.
PRECAUTIONS FOR MIRRORS, WINDOWS AND LIGHTS
• Remove all dirt from the surface of the windows and lights to ensure that you can see well.
• Adjust the rear view mirror so that you can see clearly from the operator’s seat, and always keep the surface
of the mirror clean. If any glass is broken, replace it with a new part.
• Check that the head lamps and working lamps are installed to match the operating conditions. Check also
that they light up properly.
PC340-ENG
1-9
WARNING: For reasons of safety, al-
7. PRECAUTIONS DURING OPERATION
ways follow these safety precautions.
7.2 OPERATING MACHINE
WHEN STARTING THE ENGINE
• Walk around for machine again just before mounting it, to check for people and objects that might be in the
way .
• NEVER start the engine if a warning tag has been attached to the wrist control.
• When starting the engine, sound the horn as an alert.
• Start and operate the machine only while seated.
• Do not allow anyone other than the operator to ride in the cab or on the machine body.
• For machines equipped with a travel alarm buzzer, check that the warning device operates correctly.
CHECK DIRECTION BEFORE STARTING MACHINE
Before operating the travel lever, check the direction of the track frame. If the sprocket is at the front, the travel
lever must be operated in the opposite direction.
Travel operations n See 12.4 “TO MOVE THE MACHINE OFF.”
Travel in reverse direction
CHECK THAT NO ONE IS IN THE AREA BEFORE SWINGING OR
TRAVELLING IN REVERSE
• Always position a signalman in places in dangerous places or
places where the view is not clear.
• Make sure that no one comes inside the swing radius or
direction of travel.
• Before starting to move, sound the horn or give a signal to warn
people not to come close to the machine.
• There are blind spots behind the machine, so if necessary,
swing the upper structure to check that there is no one behind the
machine before travelling in reverse.
1-10
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
7. PRECAUTIONS DURING OPERATION
PRECAUTIONS WHEN TRAVELLING
• Fold in the work equipment as shown in the diagram below , and keep it at a height of 40-50 cm (16 to
20 in) from the ground level before starting to travel.
• When travelling, do not operate the work equipment control levers. If the work equipment control
levers have to be operated, never operate them suddenly.
• When travelling on rough ground, travel at low speed, and avoid sudden changes in direction.
• A void travelling over obstacles as far as possible. If the machine has to travel over an obstacle, keep
the work equipment as close to the ground as possible and travel at low speed. Never travel over
obstacles which make the machine tilt strongly (10o or more).
TRAVELLING ON SLOPES
• Travelling on hills, banks or slopes that are steep could result in the machine tipping over or slipping.
• On hills, banks or slopes, carry the bucket closer to the ground, approximately 20 to 30 cm (8 to 12 in)
above the ground. In case of emergency, quickly lower the bucket to the ground to help the machine
stop and prevent it from tipping over.
• Do not turn on slopes or travel across slopes. Always go down to a flat place to perform these operations.
Method of travelling on slopes n See 12.12 “PRECAUTIONS WHEN TRAVELLING UP OR
DOWN HILLS.”
• Do not travel up and down on grass, fallen leaves, and wet steel plates. These materials may allow
the machine to slip, if it is travelling sideways. Keep travel speed very low.
PC340-ENG
20 - 30 cm (8 - 12 in)
1-11
WARNING: For reasons of safety, al-
7. PRECAUTIONS DURING OPERATION
ways follow these safety precautions.
PROHIBITED OPERATIONS
• Do not dig the work face under an overhang. This may cause the overhang to collapse and fall on top of the
machine.
• Do not carry out deep digging under the front of the machine. The ground under the machine may collapse
and cause the machine to fall.
DO NOT GO CLOSE TO HIGH-VOLTAGE CABLES
• Going close to high-voltage cables can cause electric shock. Always maintain the safe distance given below
between the machine and the electric cable.
• The following actions are effective in preventing accidents.
1) Wear shoes with rubber of leather soles.
2) Use a signalman to give warning if the machine approaches too close to the electric cable.
• If the work equipment should touch the electric cable, the operator should not leave the operator’s compartment.
• When carrying out operations near high voltage cables, do not let anyone come close to the machine.
• Check with the electricity company about the voltage of the cables before starting operations.
Voltage Min. safety
distance
6.6 kV 3 m 10 ft
33.0 kV 4 m 14 ft
66.0 kV 5 m 17 ft
154.0 kV 8 m 27 ft
275.0 kV 10 m 33 ft
1-12
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
7. PRECAUTIONS DURING OPERATION
DO NOT HIT WORK EQUIPMENT
• When working in places where there are height limits, such as in tunnels, under bridges, under electric
cables, or in garages, be extremely careful not to hit the boom or arm.
ENSURE GOOD VISIBILITY
• When working in dark places, install working lamps and head lamps, and set up lighting in the work area if
necessary.
• Stop operations if the visibility is poor , such as in mist, snow, or rain, and wait for the weather to improve to
a condition that allows the operation to be carried out safely.
OPERATE CAREFULLY ON SNOW
• When working on snow or icy roads, even a slight slope may cause the machine to slip to the side, so
always travel at low speed and avoid sudden starting, stopping, or turning.
• When there has been heavy snow, the road shoulder and objects placed beside the road are buried in the
snow and cannot be seen, so always carry out snow-clearing operations carefully.
WORKING ON LOOSE GROUND
• Avoid operating your machine too close to the edge of cliffs, overhangs, and deep ditches. If these areas
collapse, your machine could fall or tip over and result in serious injury or death. Remember that the soil
after heavy rain or blasting is weakened in these areas.
• Earth laid on the ground and the soil near ditches are loose. They can collapse under the weight or vibration
of your machine.
• Install the HEAD GUARD (FOPS) if working in areas where there is danger of falling rocks and dirt.
PC340-ENG
1-13
7. PRECAUTIONS DURING OPERATION
OPERATIONS ON SLOPES
• When working on slopes, there is danger that the machine may
lose its balance and turn over when the swing or work equipment are operated. Always carry out these operations carefully.
• Do not swing the work equipment from the uphill side to the
downhill side when the bucket is loaded. This operation is dangerous.
(See the upper diagram on the right.)
• If the machine has to be used on a slope, pile the soil to make a
platform that will keep the machine as horizontal as possible.
(See the lower diagram on the right.)
Piled soil on slope n See 12.12 “PRECAUTIONS WHEN
TRAVELLING UP OR DOWN HILLS.”
WARNING: For reasons of safety, always follow these safety precautions.
P ARKING THE MACHINE
• Park on level ground whenever possible. If not possible, block the tracks, lower the bucket to the
ground and thrust the bucket in the ground.
• When parking on public roads, provide fences and signs, such as flags or lights, on the machine to
warn passersby to be careful. Be sure that the machine, flags or lights do not obstruct traffic.
Parking procedure n See 12.16 “PARKING THE MACHINE.”
• 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 n See 12.16 “PARKING THE MACHINE’’.
Places to lock n See 12.20 “LOCKING’’.
1-14
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
7. PRECAUTIONS DURING OPERATION
7.3 TRANSPORTATION
LOADING AND UNLOADING
• Loading and unloading the machine always involves potential hazards. EXTREME CAUTION SHOULD BE
USED.
When loading or unloading the machine, run the engine at low idling and travel at low speed.
• Perform loading and unloading on firm, level ground only . Maintain a safe distance from the edge of a road.
• ALWAYS block the wheels of the hauling vehicle and place blocks under both ramps before loading and
unloading.
• ALWA YS use ramps of adequate strength. Be sure the ramps are wide and long enough to provide a safe
loading slope.
• Be sure that the ramps are securely positioned and fastened, and that the two sides are at the same level
as one another.
• Be sure the ramp surface is clean and free of grease, oil, ice and loose materials. Remove dirt from the
machine tracks.
• NEVER correct your steering on the ramps. If necessary, drive away from the ramps and climb again.
• Swing the upper structure with extreme care on the trailer to avoid a possible accident caused by body
instability.
• After loading, block the machine tracks and secure the machine with tie-downs.
Loading and unloading See n 13 “TRANSPORTATION”
Tie-downs See n 13 “TRANSPORTATION”
SHIPPING
• When shipping the machine on a hauling vehicle, obey all state and local laws governing the weight, width,
and length of a load. Also obey all applicable traffic regulations.
• Determine the shipping route while taking into account the width, height and weight of the load.
PC340-ENG
1-15
WARNING: For reasons of safety, al-
7. PRECAUTIONS DURING OPERATION
ways follow these safety precautions.
7.4 BATTERY
BATTERY HAZARD PREVENTION
• Battery electrolyte contains sulphuric acid and can quickly burn the skin and eat holes in clothing. If you spill
acid on yourself, immediately flush the area with water.
• Battery acid could cause blindness if splashed into the eyes. If acid gets into the eyes, flush them immediately with large quantities of water and see a doctor at once.
• If you accidentally drink acid, drink a large quantity of water or milk, beaten egg or vegetable oil. Call a
doctor or poison prevention centre immediately.
• When working with batteries. ALWAYS wear safety glasses or goggles.
• Batteries generate hydrogen gas. Hydrogen gas is very EXPLOSIVE, and is easily ignited with a small
spark or flame.
• Before working with batteries, stop the engine and turn the starting switch to the OFF position.
• Avoid short-circuiting the battery terminals through accidental contact with metallic objects, such as tools,
across the terminals.
• When removing or installing, check which is the positive (+) terminal and negative (-) terminal.
• Tighten the battery cap securely.
• Tighten the battery terminals securely. Loosened terminals can generate sparks and lead to an explosion.
• When removing battery cap wear rubber groves to prevent electrolyte contact with skin.
STARTING WITH BOOSTER CABLES
• ALWAYS wear safety glasses or goggles when starting the machine with booster cables.
• When starting from another machine, do not allow the two machines to touch.
• Be sure to connect the positive (+) cable first when installing the booster cables. Disconnect the ground or
negative (-) cable first when removing them.
• If any tool touches between the positive (+) terminal and the chassis, it will cause sparks. This is dangerous,
so be sure to work carefully.
• Connect the batteries in parallel: positive to positive and negative to negative.
• When connecting the ground cable to the frame of the machine to be started, be sure to connect it as far as
possible from the battery.
Starting with booster cables n See 16.5 “IF BATTERY IS DISCHARGED.”
INCORRECT
1-16
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
7. PRECAUTIONS DURING OPERATION
7.5 TOWING
WHEN TOWING, ATTACH WIRE TO FRAME
• Injury or death could result if a disabled machine is towed incorrectly.
• If you machine is towed by another machine, ALWAYS use a wire rope with a sufficient towing capacity.
• NEVER allow a disabled machine to be towed on a slope.
• Do not use a chinked or frayed wire rope.
• Do not straddle the towing cable or wire rope.
• When connecting up a towing machine, do not let anyone enter the area between the towing machine and
the equipment being towed.
• Set the towing machine and the towing connection of the equipment being towed in a straight line when
connecting it.
• Place pieces of wood between the wire ropes and body to protect them from wear of damage.
• Never tow the machine using the light-duty towing hole.
Towing method n See 16.2 “METHOD OF TOWING MACHINE.”
CORRECT INCORRECT
PC340-ENG
1-17
WARNING: For reasons of safety, al-
7. PRECAUTIONS DURING OPERATION
ways follow these safety precautions.
7.6 BUCKET WITH HOOK
7.6.1 GENERAL PRECAUTIONS
SPECIAL HOOK
• When carrying out lifting work, the special lifting hook is necessary.
• The following operations are prohibited.
° Lifting loads with a wire rope fitted around the bucket teeth.
° Lifting loads with the wire rope wrapped directly around the
boom or arm.
CHECKING HOOK
• When lifting a load, carry out the following checks to confirm that there is no abnormality before starting
operations.
° Check that there are no cracks or deformation in the lifting equipment.
° Check that there is no abnormality in the stopper device.
GEFAHR
HOOKING WIRE ROPE SECURELY TO HOOK
• When performing lifting operation, securely hook the wire rope onto the special lifting hook.
PRECAUTIONS FOR MACHINE INSTALLATION
• After carrying out a preliminary inspection of ground conditions, select a flat, solid location. Confirm that the
machine can be safely operated without toppling or rolling.
PROHIBITED OPERATIONS OTHER THAN MAIN APPLICATIONS
• When performing lifting operation, never raise or lower a person.
NO PERSONS SHALL BE PERMITTED TO ENTER THE WORKING AREA
• Due to the possible danger of the load falling or of collision with the load, no persons shall be allowed in the
working area.
1-18
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
7. PRECAUTIONS DURING OPERATION
OPERATION SUPERVISOR
• Before performing lifting operation, designate an operation supervisor.
Always execute operation according to his instructions.
° Execute operating methods and procedures under his direction.
° Select a person responsible for signalling. Operate only on signals given by such person.
HANDLING OF WIRE ROPES ETC.
• Wear leather gloves when handling wire ropes.
HANDLING OF FLUIDS
• Some oils and other fluids, such as Antifreeze, can be harmful to you and the environment, you should
therefore always follow the manufacturers instructions regarding storage, handling and disposal.
HANDLING OF USED ENGINE OILS
• Avoid contact with used engine oils.
• Refer to engine oils data sheet for handling and storage precautions.
HANDLING OF OILS
• For diesel oils, hydraulic oils and oils used in the swing machinery , PTO, transmission axles and hubs avoid
prolonged or frequent contact with skin.
• Refer to manufacturers data sheet for handling and storage precautions.
HANDLING OF FLUIDS
• For antifreeze and grease refer to manufacturers data sheet for handling and storage precautions.
PROTECTING EYES
• Some oils and fluids can damage eyes. Refer to manufactured data sheet for handling and storage instructions.
PC340-ENG
1-19
WARNING: For reasons of safety, al-
7. PRECAUTIONS DURING OPERATION
ways follow these safety precautions.
7.6.2 PRECAUTIONS FOR LIFTING OPERATION
GRADUAL LIFTING OPERATION
• When carrying out lifting operations, run the engine at low idling and use the L.O. (lifting operation mode).
• Avoid sudden lever shifting and acceleration.
• Swing speed is three to four times that of movable cranes. Therefore, be especially careful when performing
swing operation.
NEVER LEAVE THE OPERATOR’S SEAT
• Never leave the operator’s seat while lifting a load.
NEVER CARRY OUT EXCESSIVE OPERATIONS
• Operation exceeding machine performance may result in accident or failure.
• Carry out lifting operation within specified load limit.
• Never carry out operations which may damage the machine such as overload or over-impact-load.
• Never drag a load laterally or longitudinally , nor retract the arm, otherwise, a dangerous situation may result.
NEVER TRAVELLING WHILE LIFTING A LOAD
• Never travel while carrying a load.
OPERATING POSTURE
• If the machine posture is not correct, the wire ropes or ring may detach from the hook. Confirm that the hook
angle is correct to avoid this.
1-20
PC340-ENG
8. PRECAUTIONS FOR MAINTENANCE
8.1 BEFORE CARRYING OUT MAINTENANCE
WARNING TAG
• If others start the engine or operate the controls while you are performing service or lubrication, you could
suffer serious injury or death.
• ALWAYS attach the WARNING TAG to the control lever in the operator’s cab to alert others that you are
working on the machine. Attach additional warning tags around the machine, if necessary.
• These tags are available from your Komtasu distributor. (Part no. 20E-00-K1340)
PROPER TOOLS
• Use only tools suited to the task. Using damaged, low quality , faulty , or makeshift tools could cause personal
injury .
T ools n See 21.1 “INTRODUCTION OF NECESSARY TOOLS’’.
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
• Replace the following fire-related components periodically:
Fuel system: Fuel hose, spilling hose, and fuel tube cap
Hydraulic system: Pump outlet hose, and front and rear pump branch hoses
• Replace these components periodically with new ones, regardless of whether or not they appear to be
defective. These components deteriorate over time.
PC340-ENG
• Replace or repair any such components if any defect is found, event though they have not reached the time
specified. Replacement of safety critical components
n See 22 “PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS’’.
1-21
WARNING: For reasons of safety, al-
8. PRECAUTIONS FOR OPERATION
ways follow these safety precautions.
STOP THE ENGINE BEFORE CARRYING OUT INSPECTION
AND MAINTENANCE
• Always stop the machine on firm flat ground and stop the engine before carrying out inspection and maintenance.
• If it is necessary to run the engine when carrying out maintenance, such as when cleaning the inside of the
radiator, place the safety lock lever at the LOCK position and carry out the operation with two workers.
• One worker should sit in the operator’s seat so that he can stop the engine immediately if necessary. He
should also be extremely careful not to touch any lever by mistake. T ouch the levers only when they have to
be operated.
• The worker carrying out the maintenance should be extremely careful not to touch or get caught in the
moving parts.
RULES TO FOLLOW WHEN ADDING FUEL OR OIL
• Spilt fuel and oil may cause you to slip, so always wipe it up immediately.
• Always tighten the cap of the fuel and oil fillers securely.
• Never use fuel for washing any parts.
• Always add fuel and oil in a well-ventilated place.
1-22
PC340-ENG
Failure to follow these safety precautions may lead to a serious accident.
8. PRECAUTIONS FOR OPERATION
RADIATOR WATER LEVEL
• If it is necessary to add water to the radiator, stop the engine and allow the engine and radiator to cool down
before adding the water.
• Slowly loosen the caps to relieve pressure before removing the caps.
USE OF LIGHTING
• When checking fuel, oil, coolant, or battery electrolyte, always use lighting with anti-explosion specifications.
If such lighting equipment is not used, there is danger of explosion.
PC340-ENG
1-23
WARNING: For reasons of safety, al-
8. PRECAUTIONS FOR MAINTENANCE
ways follow these safety precautions.
8.2 DURING MAINTENANCE
PERSONNEL
• Only authorised personnel can service and repair the machine. Extra precaution should be used when
grinding, welding, and using a sledge-hammer.
ATTACHMENTS
• Place attachments that have been removed from the machine in a safe place so that they do not fall. If they
fall on you or others, serious injury could result.
WORK UNDER THE MACHINE
• Always lower all movable work equipment to the ground or to their lowest position before performing service
or repairs under the machine.
• Always block the track shoes of the machine securely.
• Never work under the machine if the machine is poorly supported.
KEEP THE MACHINE CLEAN
• Spilt oil or grease, or scattered tools or broken pieces are dangerous because they may cause you to slip or
trip.
Always keep your machine clean and tidy.
• If water gets into the electrical system, there is danger that the machine may not move or may move unexpectedly .
Do not use water or steam to clean the sensors, connectors, or the inside of the operator’s compartment.
1-24
PC340-ENG
WARNING: For reasons of safety,
always follow these safety precautions.
8. PRECAUTIONS FOR OPERATION
PRECAUTIONS WITH BATTERY
• When repairing the electrical system or when carrying out electrical welding, remove the negative (-)
terminal of the battery to stop the flow of current.
HANDLING HIGH-PRESSURE HOSES
• Do not bend high-pressure hoses or hit them with hard objects. Do not use any bent or cracked piping,
tubes or hoses. They may burst during use.
• Always repair any loose or broken fuel hoses or oil hoses. If fuel or oil leaks, it may cause a fire.
PRECAUTIONS WITH HIGH PRESSURE OIL
• Do not forget that the work equipment circuits are always under pressure.
• Do not add oil, drain oil, or carry out maintenance or inspection before completely releasing the internal
pressure.
• If oil is leaking under high pressure from small holes, it is dangerous if the jet of high-pressure oil hits your
skin or enters your eyes. Always wear safety glasses and thick gloves, and use a piece of cardboard or a
sheet of wood to check for oil leakage.
• If you are hit by a jet of high-pressure oil, consult a doctor immediately for medical attention.
PC340-ENG
1-25
WARNING: For reasons of safety, al-
8. PRECAUTIONS FOR MAINTENANCE
ways follow these safety precautions.
PRECAUTIONS WHEN CARRYING OUT MAINTENANCE AT
HIGH TEMPERATURE OR HIGH PRESSURE
• Immediately after stopping operations, the engine cooling water and oil at all parts is at high temperature
and under high pressure.
In this condition, if the cap is removed, or the oil or water are drained, or the filters are replaced, this may
result in burns or other injury. Wait for the temperature to go down, then carry out the inspection and maintenance in accordance with the procedures given in this manual.
Cleaning inside or cooling system n see 24.2 “WHEN REQUIRED.”
Checking cooling water level, hydraulic oil level n see 24.3 “CHECK BEFORE STARTING.”
Checking lubricating oil level, adding oil n see 24.5, 24.6, 24.7, 24.8, 24.9
“PERIODIC MAINTENANCE.”
Changing oil, replacing filters n see 24.5, 24.6, 24.7, 24.8, 24.9
“PERIODIC MAINTENANCE.”
PRECAUTIONS WHEN USING HIGH PRESSURE
GREASE TO ADJUST TRACK TENSION
Grease is pumped into the track tension adjustment system under high pressure. If the specified procedure
for maintenance is not followed when making adjustments, the plug or grease fitting may fly out and cause
damage or personal injury.
• When loosening the grease drain plug, never loosen it more than one turn.
• Never put your face, hands, feet, or any other part of your body directly in front of any grease drain
plug or valve.
Adjusting track tension n see 24.2 “WHEN REQUIRED.”
ROTATING FAN AND BELT
• Keep away from rotating parts and be careful not to let anything get caught in them.
• If your body or tools touch the fan blades or fan belt, they may be cut off or sent flying, so never touch any
rotating parts.
1-26
PC340-ENG
WARNING: For reasons of safety,
always follow these safety precautions.
8. PRECAUTIONS FOR OPERATION
W ASTE MATERIALS
• Never dump waste oil in a sewer system, rivers, etc.
• Always put oil drained from your machine in containers. Never drain oil directly on the ground.
• Obey appropriate laws and regulations when disposing of harmful objects such as oil, fuel, coolant, solvent,
filters, batteries, and others.
PC340-ENG
1-27
9. POSITION FOR ATTACHING SAFETY LABELS
Always keep these labels clean. If they are lost or damage, attach them again or replace them with a new
label.
There are other labels in addition to the safety labels listed as follows, so handle them in the same way.
Safety labels are available from your Komatsu distributor.
POSITION FOR ATTACHING SAFETY LABELS
1-28
PC340-ENG
1. Warnings for operation, inspection and
maintenance
1. 2OE-00-K1170
• Improper operation
and maintenance can
cause serious injury or
death.
• Read the manual and
labels before operation and maintenance.
Follow instructions
and warnings in
manual and in labels
on machine.
• Keep the manual in
machine cab near operator.
If this manual is lost,
please contact your
Komatsu distributor for
a replacement.
• Always apply lock
when leaving operator’s seat.
2. 2OE-00-KI230
Warnings when opening front window
• When raising window,
• Falling window can
lock it in place with lock
pins on both sides.
cause injury.
3. 20Y -00-K2220
• Emergency exit
•
Read operation
manual before operation
PC340-ENG
1-29
WARNING: For reasons of safety, always follow these safety precautions.
4. 2OE-00-K1130
WARNING - No passengers
No passengers allowed
to ride on machine while
it is moving
WARNING - DANGER
OF FALLING OBJECTS
Do not operate where a
danger of falling objects
exists.
Consult your dealer for
fitting of FOPS protection.
HAZARDOUS - Voltage
hazard
Serious injury or death
can occur if machine or
attachments are not
kept safe distance away
from electric lines.
6. 2OE-00-K1150
Keeping out of moving
area
To prevent SEVERE INJURY or DEATH do the
following before moving
machine or its attachments:
• Sound horn to alert
people nearby.
• Be sure no one is
on or near machine
or in the swing
area.
• Rotate cab for full
view of travel path if
it can be done
safely.
• Use spotter if view
is obstructed.
5. 2OE-00-K1280
Pump control override switch and swing lock override switch
Read operation manual before operation
Always follow the
above.
7. 2OE-00-K1140
1-30
PC340-ENG
WARNING: Failure to follow these safety
precautions may lead to a serious accident.
8. 2OE-00-K1310
STOP
• Do not open
cover while engine is running.
10. 2OE-00-K1190
Warning for high temperature coolant and oil
Hot water and oil
hazard
To prevent hot water
and oil from spurting
out:
• Turn engine
off.
• Allow water to
cool.
• Slowly loosen
cap to relieve
pressure
before removing.
• Read operation manual
before operation.
9. 2OE-00-K1210
Warnings for handling the accumulator
Explosion hazard
• Keep away from
flame.
• Do not weld or
drill.
• Read operation
manual before
operation.
11. 20E-00-K1110
• Warning for falling from upperstructure.
• Keep away from
sides of machine.
• Keep of counterweight.
• Do not ride on
machine when it
is moving
PC340-ENG
1-31
MEMO
1-32
PC340-ENG
OPERATION
PC340-ENG
2-1
10. GENERAL VIEW
10.1 GENERAL VIEW OF MACHINE
If directions are indicated in this section, the refer to the directions shown by in the arrows in the diagram
below.
2-2
PC340-ENG
10.2 GENERAL VIEW OF CONTROLS AND GAUGES
Travel lever
10. GENERAL VIEW
Knob button
Left work equipment
control lever
Safety lock lever
Display (for clock
and fault indication)
Rotating beacon
switch
Heater/
Airconditioner
control switch
Machine monitor
Horn button
Right work equipment
Starting switch
Fuel control dial
Cigarette lighter
Swing lock switch
Wiper switch
Lamp switch
Alarm buzzer stop
switch
Lower wiper switch
(option)
Two-stage pressure
switch
Heated operator seat
switch (option)
Service meter
Engine water temperature monitor
Fuel level monitor
Air cleaner clogging monitor
Radiator water level monitor
Engine oil pressure monitor
Overload caution monitor
Low PPC pressure monitor
Working mode selector switch
Power max
Swift slow down switch
Travel speed switch
Engine water temperature gauge
Fuel gauge
Charge level monitor
Engine oil level monitor
Hydraulic oil level
monitor
Engine pre-heatingmonitor
Swing lock monitor
Autodeceleration switch
Swing priority mode
switch
PC340-ENG
2-3
11. EXPLANATION OF COMPONENTS
The following is an explanation of the devices needed for operating
the machine.
To carry out suitable operations correctly and safely, it is important to
understand fully the methods of operating the equipment and the meanings of the displays.
11.1 MACHINE MONITOR
A. BASIC CHECK ITEMS (11.1.1)
This displays the basic items that should be checked before starting
the engine.
If there is any abnormality, the appropriate monitor lamp will flash.
NOTICE
When carrying out checks before starting, do not simply rely on
the monitor. Always refer to the periodic maintenance items or 12.
“ OPERATION” to carry out the checks.
2-4
PC340-ENG
B. CAUTION ITEMS (11.1.2)
CAUTION
If these monitor items flash, check and repair the appropriate
location as soon as possible.
These are items which need to be observed while the engine is running. If any abnormality occurs, items which need to be repaired as soon
as possible are displayed.
If there is any abnormality, the appropriate monitor lamp will flash to
indicate the location of the abnormality.
C. EMERGENCY STOP ITEMS (11.1.3)
CAUTION
If these monitors items flash, stop operations immediately, then
check and repair the appropriate location.
These are items which need to be observed while the engine is running. If any abnormality occurs, items which need to be repaired immediately are displayed.
If there is any abnormality, the appropriate monitor lamp will flash to
indicate the location of the abnormality and the buzzer will sound.
11. EXPLANATION OF COMPONENTS
D. METER DISPLAY PORTION (11.1.4)
This portion consists of pre-heating monitor, swing lock monitor, engine water temperature gauge, fuel gauge and display.
E. SWITCHES (11.1.5)
The switches are used for setting clock time and for selecting working mode and travel speed.
PC340-ENG
2-5
11. EXPLANATION OF COMPONENTS
11.1.1 A: BASIC CHECK ITEMS
NOTICE
Do not rely on the “BASIC CHECK ITEMS” only for the check
before starting
Always refer to the periodic maintenance items or 12. “OPERA-
TION” to carry out the checks.
1. RADIAT OR W A TER LEVEL
This warns that the radiator cooling water level is too low. If the monitor lamp flashes, check the cooling water level in the radiator and reserve
tank, and add water.
2. ENGINE OIL LEVEL
This warns that the oil level in the engine oil pan is too low. If the
monitor lamp flashes, check the oil level in the engine oil pan, and add oil.
2-6
PC340-ENG
3. HYDRAULIC OIL LEVEL
This warns that the hydraulic oil level is too low.
If the monitor lamp flashes, check the hydraulic oil level, and add oil.
11.1.2 B: CAUTION ITEMS
CAUTION
If the caution monitor lamp flashes, repair the problem as soon
as possible.
1. CHARGE LEVEL
This monitor indicates an abnormality in the charging system while
the engine is running. If the monitor lamp flashes, check the V-belt tension. If any abnormality is found, see “16.6 OTHER TROUBLE”.
11. EXPLANATION OF COMPONENTS
REMARK
While the starting switch is ON, the lamp will remain lit and will go off
once the engine is started.
2. FUEL LEVEL
If the fuel drops below 55 litres (14.5 US gal, 12.2 UK gal), the lamp
will flash. Top up the fuel before this.
3. AIR CLEANER CLOGGING
This warns that the air cleaner is clogged.
If the monitor lamp flashes, stop the engine then inspect and clean
the air cleaner.
4. OVERLOAD CAUTION (When lifting)
This warns that the machine is close to tipping due to the load ( an
audible warning is also given), if the warning is given lower the load. Refer
to the lifting capacity chart for safe load.
PC340-ENG
2-7
11. EXPLANATION OF COMPONENTS
5. LOW PPC PRESSURE
This warns that pilot control pressure is low if the monitor lamp
flashes. Check for leaks in pilot lines.
If none are found & warning persists consult your Komatsu distribu-
tor.
11.1.3 C: EMERGENCY STOP ITEMS
CAUTION
If any monitor lamp flashes, stop the engine or run it at low
idling, and take the following action.
1. ENGINE WATER TEMPERATURE
If the temperature of the engine cooling water becomes abnormally
high, the monitor lamp flashes, and the overheat prevention system is
automatically actuated to reduce the engine speed.
Stop operations and run the engine at low idling until the engine water temperature gauge enters the green range.
2. RADIATOR WATER LEVEL
If the radiator water level drops, the monitor lamp flashes. Stop the
engine, check the radiator water level, and add water if necessary.
3. ENGINE OIL PRESSURE
If the engine oil pressure drops below the normal pressure, the monitor lamp flashes. At this item, stop the engine and inspect it according to
16.6 “OTHER TROUBLE.”
REMARK
While the starting switch is ON, the lamp remains lit and goes off
once the engine is started. When the engine starts, the buzzer may sound
for a short time, however, this does not indicate a fault.
2-8
PC340-ENG
11.1.4 D: METER DISPLAY PORTION
11. EXPLANATION OF COMPONENTS
PILOT DISPLAY
When the starting switch is ON, the pilot display lights up when the
display items are functioning.
1. ENGINE PRE-HEATING MONITOR
This monitor lamp indicates the pre-heating time required when start-
ing the engine at an ambient temperature below 0oC.
The monitor lamp lights when the starting switch is turned to HEAT
position and flashes after about 30 seconds to show that the pre-heating
is completed. (The monitor lamp will go off after about 10 seconds.)
2. SWING LOCK MONITOR
This informs the operator that the swing lock is being actuated. Actuated: Lights up
When the swing lock switch is turned ON (ACTUATED), the monitor
lamp lights up.
When the swing lock override switch is turned on, this monitor lamp
flashes.
REMARK
A disc brake is installed in the swing motor to mechanically stop motor rotation.
The brake is always applied while the swing lock is actuated.
PC340-ENG
2-9
11. EXPLANATION OF COMPONENTS
METERS
3. ENGINE WATER TEMPERATURE GAUGE
This gauge indicates the engine cooling water temperature.
If the temperature is normal during operation, the green range will
light up.
If the red range lights up during operation, the overheat prevention
system will be actuated.
The overheat prevention system acts as follows.
Red range a lights up:
Output horsepower drops, and water temperature monitor c flashes.
When red range b lights up:
Engine speed is lowered further to low idling, engine water temperature
monitor c lights up, and alarm buzzer sounds at the same time.
The overheat prevention system is actuated until the temperature enters
the green range.
When red range b lights, if the engine water temperature is reduced
and the fuel control dial is turned to the low idling position, the display will
be cancelled.
4. FUEL GAUGE
This gauge indicates the amount of fuel in the fuel tank. If the fuel
level is normal during operation, the green range will light up.
If only the red range lights up during operation, there is less than 55
litres (14.5 US gal, 12.2 UK gal) of fuel remaining in the tank, so check
and add fuel.
After the starting switch is turned ON, the correct level may not be
displayed for a moment, but this does not indicate any abnormality.
When stopping the engine, turn the starting switch ON and check
that the monitor lamps on items A, B, C and D and the meters light up.
5. DISPLAY
This normally displays the clock time. If there is any abnomality, the
type of failure is indicated when the starting switch is turned ON.
2-10
PC340-ENG
Manual setting
1. When the time is displayed, depress clock switch y for 2.5 sec or
more.
2. “TIME” flashes.
3. Pressing H switch x increases hours and pressing M switch c increases minutes. If switch b or c is pressed for 2.5 seconds or
more, hours or minutes increase continuously.
4. When the correct time is reached, press clock switch y. This completes clock setting.
Correct time setting
1. When the time is displayed, depress the clock switch for 2.5 sec or
more.
2. “TIME” flashes.
3. When SET switch v is pressed, the hour is rounded off for 0 to 14
minutes and rounded up for 45 to 59 minutes.
[Examples) 10:14 becomes 10:00 /rounded off)
10:45 becomes 11:00 (rounded up)
When SET switch (4) is pressed at the time signal or standard clock,
the correct time is obtained.
4. When the correct time is reached, press clock switch y. This , completes clock setting.
11. EXPLANATION OF COMPONENTS
If the machine has a fault, error information appears while the starting
switch is turned ON. The monitor flashes and displays all error informations sequentially.
Monitor indications Error mode
E02 TVC valve system error
E03 Swing brake system error
E05 Governor system error
CALL Non-operating error
If any of these monitors flashes, see 16.6.4 “ELECTRONIC CON-
TROL SYSTEM”.
6. SERIVE METER
This displays the accumulated hours of operation of the machine.
Use the display to determine the intervals for periodic maintenance.
The service meter will advance while the engine is running even if the
machine is not moving.
The service meter reading advances by 1 for every hour that the en-
gine is running, regardless of the engine speed.
PC340-ENG
2-11
11. EXPLANATION OF COMPONENTS
11.1.5 E: SWITCHES
a
d
H/O G/O F/O L/O B/O
b
e
1. WORKING MODE SELECTOR SWITCH (Basic switch)
This switch is used to set the movement or power for the work equipment. By selecting the mode to match the working conditions, it is possible to carry out operations more easily.
H.O. (heavy-duty operation mode) lights up:
This is used for heavy-duty work.
G.O. (general operation model lights up:
This is used for ordinary work.
F.O. (finishing operation mode) lights up:
This is used for levelling or grading work.
L.O. (lifting operation mode) lights up:
This is used for fine control operations.
B.O. (breaker operation mode) lights up:
This is used for breaker work.
When starting the engine, G.O. (general operation) mode is automatically selected. Each time the switch is pressed, the mode selection
changes.
e
H/O G/O F/O L/O B/O
NOTICE
When the breaker is used, never select the H.O. (heavy-duty
operation) mode.
REMARK
H switch is also used for setting “hours” in the clock and M switch for
setting “minutes”. See 11.1.4-5 “DISPLAY”.
2-12
PC340-ENG
2. AUTO-DECELERATION SWITCH (Selection switch)
This switch acts to activate the function that automatically lowers the
engine speed and reduces fuel consumption when the control lever is at
neutral.
ON lights up: Auto-deceleration is actuated.
OFF: Auto-deceleration is cancelled.
Each time the switch is pressed, the auto-deceleration is actuated or
cancelled.
3. TRAVEL SPEED SWITCH
11. EXPLANATION OF COMPONENTS
WARNING
If the Hi-Lo switch is operated when the machine is travelling, the
machine may deviate even when travelling in a straight line. To
prevent this, always stop the machine before operating the travel
speed switch.
This is used to select the three travel speeds.
Lo lights up: Low speed travel
Mi lights up: Mid range speed travel
Hi lights up: High speed travel
When the engine is started, the travel speed is automatically set to
Lo.
When travelling in Hi, the travel speed is automatically adjusted to
match the travel surface on soft ground or when travelling uphill, so there
is no need to operate this switch. The monitor indication keeps lamp Hi or
Mi lighted.
PC340-ENG
2-13
11. EXPLANATION OF COMPONENTS
4. POWER MAX./SWIFT SLOW-DOWN SWITCH
During operations, the digging power can be increased and the
speed reduced by a one-touch operation of the knob button /single click
while pushing).
Power max. (power up) lights up:
When the working mode is heavy-duty and general operation mode only,
the power can be increased while the knob button is being pressed. Even
if the knob button continues to be pressed, the increase in power finishes
after approx. 8.5 sec.
Swift slow-down (speed down) lights up:
When the working mode is heavy-duty operation and general operation
mode only, the speed is reduced while the knob button is being pressed.
When the engine is started, the power max. lamp lights up. Each time this
switch on the monitor panel is pressed, the mode is switch.
5. SWING PRIORITY MODE SWITCH (Selection switch)
This switch changes the speed distribution by the combination of
boom and swing operation as that priority is given to swing operation.
ON lights up: This is available for 180o swing and loading.
OFF: This is used for ordinary work (90o swing and loading).
2-14
PC340-ENG
11.2 SWITCHES
11. EXPLANATION OF COMPONENTS
1. STARTING SWITCH
This switch is used to start or stop the engine.
OFF position
The key can be inserted or withdrawn. Except for the cab lamp, radio
(if fitted) and clock, the switches for the electric system are all turned off
and the engine is stopped.
ON position
Electric current flows in the charging and lamp circuits.
Keep the starting switch key at the ON position while the engine is
running.
START position
This is the engine-start position. Keep the key at this position during
cranking. Immediately after starting the engine, release the key which will
automatically return to the ON position.
HEAT (preheat) position
When starting the engine in winter, set the key to this position. When
the key is set to the HEAT position, the pre-heating monitor lights up.
Keep the key at this position until the monitor lamp goes off. Immediately
after the pre-heating monitor goes off, release the key . The key automatically returns to the OFF position. Then, start the engine by turning the key
to the START position.
PC340-ENG
2-15
11. EXPLANATION OF COMPONENTS
2. FUEL CONTROL DIAL
(WITH AUTO-DECELERATION MECHANISM)
This adjusts the engine speed and output.
(1) Low idling (MIN): Turned fully to the left
(2) Full speed (MAX): Turned fully to the right
3. CIGARETTE LIGHTER
This is used to light cigarettes. To use, push the lighter in. After a few
seconds it will spring back.
Pull out the lighter and light your cigarette.
Nothing may be connected to the cigarette lighter without the prior
permission of an authorised Komatsu distributor.
4. SWING LOCK SWITCH
WARNING
• When the machine is travelling under its own power, or when
the swing is not being operated, always set the switch to the
ON (ACTUATED) position.
• On a slope, the work equipment may swing to the down side
even if the swing lock switch is located at the ON position. Be
careful concerning this point.
This switch is used to lock the upper structure so that it cannot swing.
ON position (actuated):
The swing lock is always applied, and the upper structure will not
swing even if the swing is operated. In this condition, the swing lock lamp
lights up.
OFF position (cancelled):
The swing lock is applied only when the swing control lever is at neu-
tral; when the swing control lever is operated, it is cancelled.
The swing lock is actuated approx. 4 seconds after the swing lever is
placed in neutral.
5. WIPER SWITCH
This switch actuates the front window wiper.
y OFF: The wiper stops.
x ON: The wiper moves continuously
c Window washer fluid is sprayed out: When the switch is released, it
returns to b.
v ON: The wiper moves intermittently.
b Window washer fluid is sprayed out: When the switch is released, it
returns to d.
2-16
PC340-ENG
6. LAMP SWITCH
This switch turns on the working lamps and monitor illumination.
a OFF
b Standard work lamps
c Standard and additional work lamps (if fitted)
7. ALARM BUZZER STOP SWITCH
This is used to stop the alarm buzzer when it has sounded to warn of
some abnormality in the EMERGENCY STOP ITEMS while the engine is
running.
8. LOWER WIPER SWITCH (If fitted)
This switch actuates the front lower wiper.
OFF: wiper stops
ON: wiper moves continuously
NB. Do not operate with front lower screen removed.
11. EXPLANATION OF COMPONENTS
9. HORN BUTTON
When the button at the tip of the right work equipment control lever is
pressed, the horn will sound.
10. KNOB BUTTON
The button at the tip of the left work equipment control lever is used
to actuate the power max./swift slow-down functions. Press the button
once (single click) and keep it depressed. In the heavy-duty and general
operation modes, the power max. function actuates for max. 8.5 seconds
and the swift slow-down function actuates while the button is depressed.
11. HEATED OPERATOR SEAT SWITCH (If fitted)
This switch is used to switch on the heated seat.
OFF: seat not heated
ON : seat heated
12. BEACON SWITCH (If fitted)
This switch is used to switch on the rotating beacon.
OFF
ON: beacon lights lights and rotates
PC340-ENG
2-17
11. EXPLANATION OF COMPONENTS
13. TWO STAGE PRESSURE RELIEF
This switch is used to switch the safety valve set pressure at the head
end of the boom cylinder to two levels.
a Low pressure setting: The boom thrust force is weak, so the
swaying of the chassis is small during
digging operations, and digging operations can be carried out smoothly . This is
used for general digging operations on
normal ground, soft rock, or blasted rock.
b High pressure setting: The trustin force of the boom becomes
more powerful, so it is easy to twist and
swing or escape from soft ground. It is
effective in carrying out digging operations using the bucket and the weight of
the machine in confined areas.
n
14. CAB LAMP SWITCH
This lights up the cab lamp.
ON position: Lights up
The cab lamp can be turned on even when the starting switch
is at the OFF position, so be careful not to leave it on by mistake.
15. PUMP CONTROL OVERRIDE SWITCH
When normal: Switch is down
When abnormal: When the monitor display shows E02 (TVC valve
system error), it is possible to carry out operation when this switch is
moved up. The pump control override switch is designed to allow operations to be carried out for a short period when there is an abnormality in
the pump control system (TVC valve system error). The abnormality must
be repaired immediately.
16. SWING LOCK OVERRIDE SWITCH
When normal: Switch is down
When abnormal: When the monitor display shows E03 (swing brake
system error), the brake is cancelled and it becomes possible to swing the
upper structure when this switch is moved up, so normal operations can
be carried out. However, the swing brake remains cancelled.
The swing lock override switch is designed to allow operations to be
carried out for a short period when there is an abnormality in the swing
brake electrical system (swing brake system error). The abnormality must
be repaired immediately.
o
p
2-18
PC340-ENG
11.3 CONTROL LEVERS, PEDALS
11. EXPLANATION OF COMPONENTS
1. SAFETY LOCK LEVER
WARNING
• When leaving the operator’s compartment, set the safety lock
lever securely to the LOCK position. If the control levers are
not locked, and they are touched by mistake, this may lead to
a serious accident.
If the safety lock lever is not placed securely in the LOCK position, the control levers may not be properly locked. Check that
the situation is as shown in the diagram.
• When the safety lock lever is raised, take care not to touch the
work equipment control lever. If the safety lock lever is not
properly locked at the upper position, the work equipment and
swing will move, creating a potentially dangerous situation.
• When the safety lock lever is lowered, take care not to touch
the work equipment control lever.
PC340-ENG
2-19
11. EXPLANATION OF COMPONENTS
This lever locks the work equipment, swing and attachment controls.
This lock lever is a hydraulic lock, so even if it is in the lock position,
the work equipment control lever will move, but the work equipment and
swing motor will not work.
2. TRAVEL LEVERS (WITH PEDAL, AUTO-DECELERATION
MECHANISM)
WARNING
• Do not put your foot on the pedal unless the machine is travelling. If you leave your foot on the pedal and press it by mistake, the machine will move suddenly, and this may lead to a
serious accident.
• With the track frame facing to the near, the machine will move
in the reverse direction by forward travelling and in the forward direction by reverse travelling.
When the travel lever is used, check to see if the track frame is
facing forward or backward. (If the sprocket is located to the
rear, the track frame is facing forward.)
y FORWARD
The lever is pushed forward
(The pedal is angled forward)
x REVERSE:
The lever is pulled back.
(The lever is angled back)
N (Neutral): The machine stops
( ) This indicates operation of the pedal.
2-20
PC340-ENG
3. LEFT WORK EQUIPMENT CONTROL LEVER
(with auto-deceleration device)
WARNING
If any lever is operated when in the deceleration range, the engine speed will suddenly increase, so be careful when operating
the levers.
This lever is used to operate the arm and upper structure.
Arm operation Swing operation
A Arm OUT C Swing to right
B Arm IN D Swing to left
N (Neutral)
When the lever in this position, the upper structure and the arm will
be retained in the position in which they stop.
4. RIGHT WORK EQUIPMENT CONTROL LEVER
(with auto-deceleration device)
WARNING
If an lever is operated when in the deceleration range, the engine
speed will suddenly increase, so be careful when operating the
levers.
11. EXPLANATION OF COMPONENTS
This lever is used to operate the boom and bucket.
Boom operation Bucket operation
y RAISE c DUMP
x LOWER v CURL
N (Neutral)
When the lever in this position, the boom and the bucket will be
retained in the position in which they stop.
For levers b, c and d, the engine speed changes as follows be-
cause of the auto-deceleration mechanism.
• When the travel lever and work equipment control levers are at
neutral, even if the fuel control dial is above the mid-range position,
the engine speed will drop to a mid-range speed. If any of the levers are operated, the engine speed will rise to the speed set by
the fuel control dial.
• If all control levers are set to neutral, the engine speed will drop by
approx. 100 rpm, and after approx. 4 seconds, the engine speed
will drop to the deceleration speed (approx. 1400 rpm).
PC340-ENG
2-21
11. EXPLANATION OF COMPONENTS
5. ATTACHMENT CONTROL PEDAL
WARNING
Do not put your foot on the pedal except when operating the
pedal. If resting your foot on the pedal during operation, and it is
depressed by accident by accident, the attachment may move
suddenly and cause serious damage or injury.
When breaker is installed
• When the front part of the pedal is depressed, the breaker is actuated.
• Screw lock pin into hole in pedal to lock(Pedal is disabled. Unscrew
completely to unlock).
• Set the working mode to the breaker (B.O) and unlock pedal.
When general attachment is installed
• When the pedal is depressed, the attachment is actuated.
• Unlock the pedal to operate.
When no attachment is fitted or when attachment operation is not
required.
• Lock pedal using lock pin.
Lock
Pin
2-22
PC340-ENG
HYDRAULIC OIL FLOW
When the front of the pedal is depressed, the oil flows to the left
piping for the work equipment; when the rear of the pedal is depressed,
the oil flows to the right piping for the work equipment. (When the breaker
is installed, only the front of the pedal is used.)
6. BREAKER, GENERAL ATTACHMENT (CRUSHER, ETC.)
SELECTOR VALVE (OPTION)
When a breaker or general attachment (such as a crusher) are
used, turn the rotor of the 3-way valve to switch selector valve a as
shown in the table below.
(The arrow showing the direction of the port is stamped on the head
of the 3-way valve.)
11. EXPLANATION OF COMPONENTS
Attachment
Right 3-way valve a
Right side of machine
Breaker etc.
Crusher etc.
When not use
Right side of machine
Right side of machine
NOTICE
Perform work only after the engine is stopped and the work
equipment and machine body are in a stable posture on the ground.
REMARK
MENTS”
PC340-ENG
For details, see 28, page 5-5 “MACHINES READY FOR ATTACH-
2-23
11. EXPLANATION OF COMPONENTS
11.4 ROOF HATCH
When opening
1. Lock the safety lock lever securely .
2. Check for an ceiling window movement by pulling lock x located on
both sides, then push up and open the ceiling window grasping grip
y.
When closing
Close the ceiling window grasping grip y and lock it with lock x. If
the lock cannot be applied, open and close the ceiling window again.
2-24
PC340-ENG
11.5 FRONT WINDOW
WARNING
When opening the front window, always hold grip firmly with
both hands and pull up. If you use only one hand, your hand may
slip and get caught.
It is possible to store (pull up) the front window (top) in the roof of the
operator’s compartment.
When opening
WARNING
When the front window is open, there is danger that it will fall, so
always lock it with left and right lock pins A.
11. EXPLANATION OF COMPONENTS
1. Place the work equipment on flat ground and stop the engine.
2. Securely lock the safety lock lever.
3. Confirm that the wiper is stored inside the right frame.
4. Pull lock pins A at the top left and right sides of the front window to
the inside to release the lock.
PC340-ENG
2-25
11. EXPLANATION OF COMPONENTS
5. From the inside of the operator’s cab, hold the bottom grip with the
left hand and the top grip with the right hand, pull up the window , and
push it in fully until it is locked by catch C.
6. Lock with lock pins A on the left and right sides.
When closing
WARNING
When closing the window, lower it slowly and be careful not to
get your hand caught.
1. Place the work equipment on a flat ground and stop the engine.
2. Securely lock the safety lock lever.
3. Release the lock pin A.
4. Hold the grip at the bottom of the front window with your left hand and
the grip at the top with your right hand, release the lock of catch C
with your right thumb, then pull the top grip slowly and lower the front
window. When releasing the lock of catch C, push release lever D in
the direction of the arrow to release the lock.
2-26
PC340-ENG
5. Lock securely with lock pins A at the left and right sides
Removing front window (bottom)
Ensure lower wiper (if fitted) is in correct park position.
With the front window open, remove lock pins E, and the bottom part
of the front window can be removed.
Store the removed bottom part of the front window at the rear of the
operator’s cab and lock with lock pins E.
11. EXPLANATION OF COMPONENTS
Notice
Do not operate lower wiper (if fitted) when front window (bottom) is
removed.
11.6 DOOR LOCK
Use the door lock to fix the door in position after opening it.
1. The door will become fixed in place when it is pressed against catch
y.
2. To release the lock, press knob x down at the left side of the operator’s seat to release the catch.
When fixing the door, fix it firmly to the catch.
PC340-ENG
2-27
11. EXPLANATION OF COMPONENTS
11.7 CAP , COVER WITH LOCK
The fuel filler, operator’s cab, engine hood, battery box cover, right
side door and left side door of the machine body are fitted with locks.
Use the starting switch key to lock or unlock these places.
11.7.1 METHOD OF OPENING AND CLOSING CAP WITH
LOCK (For the fuel tank filler port)
To open the cap
1. Insert the key into the cap.
2. Turn the key clockwise, align the match mark on the cap with the
rotor groove, then remove the cap.
To lock the cap
1. Turn the cap into place.
2. Turn the key and take the key out.
OPEN
LOCK
Insert the key as far as it will go. If the key is turned before it is in-
serted all the way, it may break.
11.7.2 METHOD OF OPENING AND CLOSING COVER
WITH LOCK (cover with Iock)
To open the cover (locked cover)
1. Insert the key.
2. Turn it counterclockwise and open the cover by pulling the cover grip.
To lock the cover
1. Close the cover and insert the key.
2. Turn the key clockwise and take the key out.
2-28
PC340-ENG
11.8 LUGGAGE TRAY
This tray is located to the rear of the operator’s seat. Always keep the
operation & maintenance manual in this box for easy reading access.
1 1.9 ASHTRAY
This is on the side of the operator’s seat. Always make sure that you
extinguish the cigarette before closing the lid.
11.10 HEATER
11.10.1 VIEW OF CONTROL PANEL
1. Inlet air control slider
Change between internal air recirculation & external fresh air intake.
11. EXPLANATION OF COMPONENTS
Internal air circulation.
Purpose
Lever
position.
2. Air outlet selector slider
The operator can select a suitable outlet as required.
Purpose
Lever
position
This is used when wishing to quickly
warm the cab.
Sending air to upper area of
operator’s seat
External air intake. This is used for fresh
air intake or to remove condensation on
windows or when the air inside the cab is
stale.
Sending air to lower area
of operator’s seat.
PC340-ENG
Air outlets
2-29
11. EXPLANATION OF COMPONENTS
3. Temperature control slider
This adjust out air temperature
To increase temperature of outlet air: move slides to left (red)
To decrease temperature of outlet air: move slides to right (blue)
4. Air flow selector switch
This switch adjust air flow in three steps
5. Defroster selector lever
This lever is used to remove condensation or ice on the front window.
Selector lever forward: defrost
Selector lever backward: warms operator’s feet
Defroster is available when air outlet slider is in the position shown
by decal:
A DEFROSTER
B FEET
11.11 AIR CONDITIONER(OPTION)
BLUE RED
Description
The optional air conditioner can be used to cool, heat & de-humidify
operators cab.
1. HEAT CONTROL SLIDER
By sliding control lever a to the right (red) the air passing through the
airconditioner unit will be warmed. In heating mode fresh ambient temperature air can be introduced to the cab when the lever a is to the left
(blue). In air conditioner mode temperature is controlled by adjusting lever a to introduce some warm air to achieve desired temperature.
2-30
PC340-ENG
2. Outlet air distribution
Outlet air can be distributed through various vents in the operators cab.
11. EXPLANATION OF COMPONENTS
Purpose
Sending air to lower area of
operator’s seat
Sending air to upper area
of operator’s seat.
Lever
position
Air outlets
3. Inlet air control slider
Changes between internal air recirculation & external fresh air intake.
Purpose
Internal air circulation.
This is used when wishing to
quickly cool or warm the cab.
External air intake.
This is used for fresh air
intake or to remove
condensation or ice on
windows or when the air
inside the cab is stale.
Lever
position.
4. AIR FLOW SELECTOR SWITCH.
This switch adjust air flow in three steps.
5. AIR CONDITIONER ON/OFF
This switch functions as an ON / OFF switch for the air con-
ditioner system.
Notice
The fan selector switch d must be selected to position 1,2
or 3 before air condition can be operated.
PC340-ENG
2-31
11. EXPLANATION OF COMPONENTS
6. Defroster selector lever
This lever is used to remove condensation on the front window during
winter or rainy season.
Selector lever forward: defrost
Selector lever backwards: warms operator’s feet
Defroster is available when air outlet slider is in the position shown by
decal:
A Defroster
B Feet
11.11.2 PRECAUTION WHEN USING AIR
CONDITIONER
During cooling, ventilate the air from time to time.
• If operator is smoking during cooling, eyes may occasionally smart. In
this case, temporarily change the switch to ventilation/cooling to ex-
haust the smoke.
• When cooling for a long time period, select ventilation/cooling once an
hour.
Avoiding excessive cooling.
• If the operator feels somewhat cool when entering a cooled cab, the
temperature (temperature difference between external temperature is
5o to 6oC(9oF to 11oF)) is at the optimum level from a health viewpoint.
Adjust the cooling temperature carefully.
2-32
PC340-ENG
11.12 CAB RADIO (OPTION)
Refer to the separate operation manual for radio cassette.
Note
Ensure radio is switched off when leaving the machine for long peri-
ods to prevent draining of battery charge.
Antenna
If the reception is weak or generates noise, extend the antenna. If the
reception is to strong, adjust the sensitivity by retracting the antenna.
NOTICE
When transporting the machine or parking it in a garage, always fully
retract the antenna to avoid the possibility of breakage.
11.12.1 PRECAUTION OF USE
• To ensure safe operation, adjust the volume level so that external
noise is still audible.
11. EXPLANATION OF COMPONENTS
• Ensure no water is splashed over the speaker case or cab radio to
prevent malfunction.
• Never use solution such as benzine or tinners to clean the dial or
buttons. These should be wiped with a dry, soft cloth. (Use a cloth
dipping in alcohol for very dirty surfaces.)
• At battery replacement, all the memory pre-set with the pre-set buttons will be cleared. Perform pre-setting again.
PC340-ENG
2-33
11. EXPLANATION OF COMPONENTS
11.13 FUSE
NOTICE
Before replacing a fuse, be sure to turn off the starting switch.
The fuses protect the electrical equipment and wiring from burning
out.
If the fuse becomes corroded, or white powder can be seen, or the
fuse is loose in the fuse holder, replace the fuse. Replace a fuse with
another of the same capacity.
Fuse capacity and name of circuit
No Fuse capacity Name of circuit
y 10 A Governor and pump controller
x 10 A Solenoid valve
c 20 A Air Conditioner (Motor)
v 20 A
b 20 A Cigar lighter, Air conditioner (control),
n 10 A Horn
m 15 A Wiper motor controller
h 20 A Lamp (Cab x 3)
j 20 A Lower wiper, Refuelling pump
j 10 A Key switch signal
k 15 A Lamp (Counterweight, Heated seat)
l 10 A Engine room lamp
m 10 A Alarm buzzer, Monitor
n 20 A Battery relay, Start signal
Lamp (Deck left hand, Deck right hand,
Boom left hand, Boom right hand)
Heater, Window washer, Left knop
switch
o 10 A Roomlamp, Radio
p 10 A Spare fuse
q 10 A Spare fuse
r 10 A Spare fuse
s 20 A Spare fuse
2-34
PC340-ENG
11.14 FUSIBLE LINK
2
3
If the starting motor will not rotate when the starting switch is turned
ON, a possible cause is disconnection of wire-type fusible link a. Open
the battery room door on the left side of the machine body to inspect the
fusible link and, if necessary, replace it.
REMARK
A fusible link refers to the large-sized fuse wiring installed in the high
current flow portion of the circuit to protect electrical components and
wiring from burning, similar to an ordinary fuse.
11.15 CONTROLLERS
A pump controller and governor controller are provided.
11. EXPLANATION OF COMPONENTS
NOTICE
• Never splash or spill water, mud or drink over the controllers as
this may cause a fault.
• If a fault occurs in the controller, do not attempt repair, but con-
sult your Komatsu distributor.
11.16 TOOL BOX
This is used for keeping the tools.
11.17 REFUELLING PUMP (Option)
WARNING
• Do not bring fire or sparks near the fuel.
1. When the machine is operated on sites with no fuel container and
pump, the machine may be refuelled using the refuelling pump a (if
fitted) from fuel barrels.
The refuelling pump is located next to batteries at the front right hand
side of the machine.
2. Place the fuel hose b, which is stored in tray c into the fuel barrel
placed next to the machine.
3. Switch on refuelling pump using switch d on the pump assembly
when adding fuel, never let the fuel overflow. This may cause a fires.
Notes
• This pump is protected bay fuse e. If pump fails to function check
fuse (10A).
• Ensure strainer on hose end is clean.
PC340-ENG
ON
OFF
e
0
2-35
11. EXPLANATION OF COMPONENTS
11.18 HANDLING THE ACCUMULATOR
WARNING
On machines equipped with an accumulator, for a short time after the engine is stopped, if the work equipment control lever is
moved to the LOWER position, the work equipment will move
down under its own weight.
After stopping the engine, always place the safety lock lever in
the LOCK position and lock the attachment control pedal with
the lock pin.
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 any boss to the accumulator.
• When disposing of the accumulator, it is necessary to re
lease the gas from the accumulator, so please contact your
Komatsu distributor.
This machine is equipped with the accumulator in the control circuit.
The accumulator is a device to store the pressure in the control circuit,
and when it is installed, the control circuit can be operated for a short time
even after the engine is stopped. Therefore, if the control lever is moved
in the direction to lower the work equipment, it is possible for the work
equipment to move under its own weight.
The accumulator is installed to the position shown in the diagram on
the right.
2-36
PC340-ENG
11.18.1 METHOD FOR RELEASING PRESSURE IN
CONTROL CIRCUIT OF MACHINES EQUIPPED
WITH ACCUMULA TOR
1. Lower the work equipment to the ground. Close any attachment such
as the crusher attachment jaws, etc.
2. Stop the engine.
3. Move the safety lock lever completely in the FREE position. Move
the work equipment control lever and attachment control pedal full to
the back and forth, right and left so as to release the pressure in the
control circuit.
4. Move the safety lock lever to the lock position. Lock the control lever
and attachment control pedal. The pressure, however, will not be
completely released, so when the accumulator is removed in the
control circuit, gradually loosen the screws. Never stand in the oil
ejection direction.
11. EXPLANATION OF COMPONENTS
PC340-ENG
2-37
12. OPERATION
12.1 CHECK BEFORE STARTING ENGINE
12.1.1 WALK-AROUND CHECK
WARNING
• Dirt, oil or fuel around the parts of the engine which reach
high temperatures may cause fire and damage to the machine.
Check carefully , and if any abnormality is found, always repair
it or contact your Komatsu distributor.
Before starting the engine, look around the machine and under the
machine to check for loose nut or bolts, or leakage of oil, fuel, or coolant,
and check the condition of the work equipment and hydraulic system.
Check also for loose wiring, play, and collection of dust at places which
reach high temperatures.
Always carry out the items in this section before starting the engine
each day.
9
1. Check for damage, wear, play in work equipment, cylinders,
linkage, hoses
Check that there are no cracks, excessive wear, or play in the work
equipment, cylinders, linkage, or hoses. If any abnormality is found,
repair it.
2-38
PC340-ENG
2. Remove dirt from around engine, radiator
Check that there is no dirt accumulated around the engine or radiator. If any dirt is found, remove it.
3. Check for leakage of water or oil around engine
Check that there is no leakage of oil from the engine or leakage of
water from the cooling system. If any abnormality is found, repair it.
4. Check for oil leakage from hydraulic equipment, hydraulic tank,
hoses, joints
Check that there is no oil leakage. If any abnormality is found, repair
the place where the oil is leaking.
5. Check the undercarriage (track, sprocket, idler, guard) for damage, wear, loose bolts or leaks of oil from rollers.
6. Check for damage to handrail, loose bolts
Repair any damage and tighten any loose.
7. Check for damage to gauges, monitor, loose bolts.
Check that there is no damage to the gauges and monitor in the
operator’s cab. If any abnormality is found, replace the parts. Clean
off any dirt on the surface.
12. OPERA TION
8. Clean rear view mirror, check for damage
Check that there is no damage to the rear view mirror. If it is damaged, replace it with a new mirror . Clean the surface of the mirror and
adjust the angle so that the view to the rear can be seen from the
operator’s seat.
9. Check bucket with hook for damage
Check the hook, catcher and hook foot for damage. If damage is
found, contact your Komatsu distributor for repair.
PC340-ENG
2-39
12. OPERATION
12.1.2 CHECK BEFORE STARTING
Always carry out the items in this section before starting the engine
each day.
CHECK COOLANT LEVEL, ADD WATER
WARNING
Do not open the radiator cap unless necessary. When checking
the coolant, always check the radiator reserve tank when the
engine is cold.
1. Open the rear door on the left side of the machine and check that the
cooling water level is between the FULL and LOW marks on radiator
reserve tank x (shown in the diagram on the right). If the water level
is low, add water through the water filler of reserve tank x to the
FULL level.
2. After adding water, tighten the cap securely.
3. If the reserve tank becomes empty, first inspect for water leaks and
then fill the radiator and the reserve tank with water.
CHECK OIL LEVEL IN ENGINE OIL PAN, ADD OIL
1. Open the engine hood.
2. Remove dipstick G and wipe the oil off with a cloth.
3. Insert dipstick G fully in the oil filler pipe, then take it out again.
4. The oil level should be between the H and L marks on dipstick G
If the oil level is below the L mark, add engine oil through oil filler F.
For details of the oil to use, see 20. “USE OF FUEL, COOLANT AND
LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE”.
2-40
PC340-ENG
5. If the oil is above the H mark, drain the excess engine oil from drain
plug P, and check the oil level again.
6. If the oil level is correct, tighten the oil filler cap securely and close
the engine hood.
REMARK
When checking the oil level after the engine has been operated, wait
for at least 15 minutes after stopping the engine before checking.
If the machine is at an angle, make it horizontal before checking.
CHECK FUEL LEVEL, ADD FUEL
WARNING
When adding fuel, never let the fuel overflow. This may cause a
fire. If spilling fuel, thoroughly clean up any spillage.
12. OPERA TION
1. Use sight gauge G on the front face of the fuel tank to check that the
tank is full.
2. If the fuel level is not within the sight gauge, add fuel through filler
port F while watching sight gauge G.
Fuel capacity: 540 l (143 US gal, 120 UK gal)
For details of the fuel to use, see 20. “USE OF FUEL, COOLANT
AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE”.
3. After adding fuel, tighten the cap securely.
REMARK
If breather holes a on the cap is clogged, the pressure in the tank
will drop and fuel will not flow.
Clean the holes from time to time.
PC340-ENG
2-41
12. OPERA TION
CHECK OIL LEVEL IN HYDRAULIC TANK, ADD OIL
WARNING
• When removing the oil filler cap, oil may spurt out, so turn the
cap slowly to release the internal pressure before removing
the cap.
• If oil has been added to above the H mark, stop the engine and
wait for the hydraulic oil to cool down, then drain the excess
oil from the drain plug P.
1. If the work equipment is not in the condition shown in the diagram on
the right, start the engine, run the engine at low speed, retract the
arm and bucket cylinders, then lower the boom, set the bucket teeth
in contact with the ground, and stop the engine.
2. Within 15 seconds after stopping the engine, move each control lever (for work equipment and travel) to the full stroke in all directions
to release the internal pressure.
3. Open the pump room door on the right side of the machine. Check
sight gauge G. The oil level is normal if between the H and L marks.
NOTICE
Do not add oil if the level is above the H line. This will damage
the hydraulic equipment and cause oil to spurt out.
4. If the level is below the L mark, remove the upper cover of the hydraulic tank and add oil through oil filler F.
For details of the oil to use, see 20. “USE OF FUEL, COOLANT AND
LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE”.
REMARK
The oil level will vary depending upon the oil temperature Accord-
ingly, use the following as a guide:
• Before operation: around L level
(Oil temperature 10 to 30oC (50 to 86oF))
• Normal operation: around H level
(Oil temperature 50 to 80oC (122 to 176oF))
2-42
PC340-ENG
CHECK AIR CLEANER FOR CLOGGING
A
B
1
1. Confirm that the air cleaner clogging monitor does not flash
2. If it flashes, immediately clean or replace the element.
For details of the method of cleaning the element, see 24.2.1 “CHECK,
CLEAN AND REPLACE AIR CLEANER ELEMENT”.
CHECK ELECTRIC WIRING
WARNING
If the fuse blows frequently, or there are traces of shortcircuiting in the electric wiring, always locate and repair the
cause.
Check for damage of the fuse and any sign of disconnection or short
circuit in the electric wiring. Check also for loose terminals and tighten
any loose parts. Check the following points carefully.
• Battery
• Starting motor
• Alternator
Please contact your Komatsu distributor for investigation and correction
of the cause.
12. OPERATION
H/O G/O F/O L/O B/O
CHECK FOR WATER IN FUEL SEDIMENT OR
The fuel sedimentor is mounted in the radiator/oil cooler compar-
timent.
1. T o drain sedimentor , turn drain valve a to position B. Drain the sump
of water until clear fuel is visible.
2. When clear fuel is seen turn drain valve a to position A.
CHECK FOR WATER IN PRIMARY FUEL FILTER, DRAIN WATER
A primary fuel filter is fitted on the engine
1. With the engine off open the engine cover and locate the water drain
at the bottom of the primary fuel filter.
2. To open drain valve, turn the valve counterclockwise approximately
1,5 to 2 turns until draining occurs. Drain the filter sump of water until
clear fuel is visible.
3. Turn the valve clockwise to close.
NOTICE:
Do not over tighten the valve. Over tightening can damage the
threads.
PC340-ENG
2-43
12. OPERA TION
12.1.3 ADJUSTMENT BEFORE OPERATION
OPERA TOR’S SEA T
(A) Fore-and-aft adjustment of seat
Pull lever y up. After the seat is set to the desired position, release
the lever.
Adjustable distance: 160 mm
(B) Adjustment of reclining seat
Pull lever b up. After the seat back is set to the optimum position for
easy operation, release the lever.
(C) Adjustment of seat tilting angle
1. Forward tilting
Pull lever c up to release locking. After the seat is set to the opti-
mum position for easy operation, release the lever to lock it.
2. Backward tilting
Push lever c down to release locking. After the seat is set to the
optimum position for easy operation, release the lever to lock it.
3. Seat height adjustment
By a combination of step 1 and 2 , the seat can be moved up and
down. After the desired height is set by forward/backup tilting, bring the
seat to the horizontal position by reverse-tilting and fix it.
Adjustable height: 60 mm (2.4 in)
2-44
PC340-ENG
(D) Armrest height adjustment
Armrest v can be raised and lowered by loosening the bolts in the
rear of the armrest columns, adjusting the height and retightening the
bolts
(E) Fore-and-aft adjustment of whole seat
After lever b is pulled up and the seat is set to the desired position,
release the lever. In this case the operator’s seat, left and right levers and
safety lock lever will slide together. Adjustable fore-and-aft movement:
120 mm (4.7 in)
(F) Suspension adjustment
When knob n is turned clockwise, the suspension becomes harder
and when turned counterclockwise, softer. Adjust the dial so that the suspension best matching the operator’s weight is selected. Adjustable
range: 50 to 120 kg (110 to 265 Ib)
12. OPERA TION
2
ADJUSTMENT OF MONITOR PANEL ANGLE
Turn the monitor panel so that the operator can view the monitor with
ease. When adjusting the angle, the panel should be set to the desired
position using both hands. The panel is automatically locked at that position.
Amount of adjustment: 30o (stepless)
PC340-ENG
2-45
12. OPERA TION
12.1.4 OPERATIONS AND CHECKS BEFORE STARTING
ENGINE
WARNING
If the control lever is touched by accident, the work equipment or
the machine may move suddenly. When leaving the operator’s
compartment, always set the safety lock lever securely to the
LOCK position.
1. Check that safety lock lever y is at the LOCK position.
2. Check the position of each lever.
Set the control lever to the neutral position.
When starting the engine, never touch the knob button.
3. Insert the key in starting switch b, turn the key to the ON position,
then carry out the following checks.
y The buzzer will sound for approx. 1 sec, and the following monitors
and gauges will light up for approx. 3 sec.
• Radiator water level monitor c
• Engine oil level monitor v
• Hydraulic oil level monitor b
• Charge level monitor n
• Fuel level monitor m
• Engine water temperature monitor h
• Engine oil pressure monitor i
• Engine water temperature gauge j
• Fuel gauge k
• Engine pre-heating monitor l
• Air cleaner clogging monitor m
• Swing lock monitor n
If the monitors or gauges do not light up or the buzzer does not
sound, there is probably a broken bulb or disconnection in the monitor
wiring, so contact your Komatsu distributor for repairs.
2-46
PC340-ENG
After approx. 3 sec, the following gauges will remain on and the other
monitors will go out.
• Engine water temperature gauge j
• Fuel gauge k
(2) Press lamp switch o to turn on the head lamps.
If the lamp switch do not light up, there is probably a broken bulb or
disconnection in the wiring, so contact your Komatsu distributor for
repairs.
12. OPERA TION
PC340-ENG
2-47
12. OPERATION
12.2 STARTING ENGINE
12.2.1 NORMAL STARTING
WARNING
Check that there are no persons or obstacles in the surrounding
area, then sound the horn and start the engine.
NOTICE
Do not keep the starting motor rotating continuously for more
than 20 seconds.
If the engine will not start, wait for at least 2 minutes before try-
ing to start the engine again.
1. Set fuel control dial a at the low idling (MIN) position.
2. Turn the key in starting switch b to the STAR T position. The engine
will start.
3. When the engine starts, release the key in starting switch b. The
key will return automatically to the ON position.
2-48
PC340-ENG
12.2.2 STARTING IN COLD WEATHER
WARNING
• Check that there are no persons or obstacles in the surround-
ing area, then sound the horn and start the engine.
• Never use starting aid fluids as they may cause explosions.
NOTICE
Do not keep the starting motor rotating continuously for more
than 20 seconds.
If the engine fails to start, repeat from step 2 and after waiting
for about 2 minutes.
When starting in low temperatures, do as follows.
1. Set fuel control dial y at the low idling (MIN) position.
12. OPERA TION
H/O G/O F/O L/O B/O
c
A
2. Hold the key in starting switch x at the HEAT position, and check
that preheating monitor c lights up.
After about 30 seconds, preheating monitor lamp c will flash for
about 10 seconds to indicate that preheating is finished.
REMARK
The monitor and gauge also light up when the key is at the HEAT
position, but this does not indicate any abnormality.
PC340-ENG
2-49
12. OPERATION
3. When preheating monitor c flashes, turn the key in starting switch
b to the START position to start the engine.
Ambient temperature Preheating time
Above 0oC-
o
0
C to -10oC 20 seconds
-10oC to -20oC 30 seconds
4. When the engine starts, release the key in starting switch b.
The key will return automatically to the ON position.
2-50
PC340-ENG
12.3 OPERATIONS AND CHECKS AFTER
STARTING ENGINE
WARNING
• Emergency stop
If there has been any abnormal actuation or trouble, turn the
starting switch key to the OFF position.
• If the work equipment is operated without warming the machine up sufficiently, the response of the work equipment to
the movement of the control lever will be slow, and the work
equipment may not move as the operator desires, so always
carry out the warming-up operation. Particularly in cold areas,
be sure to carry out the warming-up operation fully.
12.3.1 WHEN NORMAL
NOTICE
• When the hydraulic oil is at a low temperature, do not carry out
operations or move the levers suddenly. Always carry out the
warming-up operation. This will help to extend the machine life.
Do not suddenly accelerate the engine before the warming-up
operation is completed.
• Do not run the engine at low idling or high idling continuously
for more than 20 minutes. This will cause leakage of oil from the
turbocharger oil supply piping.
If it is necessary to run the engine at idling, apply a load from
time to time or run the engine at a mid-range speed.
12. OPERA TION
After starting the engine, do not immediately start operations. First,
carry out the following operations and checks.
1. Turn fuel control dial a to the center position between LOW IDLING
(MIN) and HIGH IDLING (MAX) and run the engine at medium speed
for about 5 minutes with no load.
2. While running the engine at medium speed, press working mode
switch b until the heavy-duty operation mode lamp is turned on.
PC340-ENG
2-51
12. OPERA TION
3. Set the safety lock lever c to the FREE position, and raise the
bucket from the ground.
4. Operate bucket control lever v and arm control lever b slowly to
move the bucket cylinder and arm cylinder to the end of the stroke.
5. Carry out bucket and arm operation for 5 minutes at full stroke, alternating between bucket operation and arm operation at 30 second
intervals.
If the swing lock switch n is set to the ON (actuated) position and
swing control lever b is operated at full stroke, oil temperature rise
can be increased earlier.
NOTICE
When the work equipment is retracted, take care that it does not
interfere with the machine body or ground.
6. After carrying out the warming-up operation, check that each gauge
and monitor lamp is in the following condition.
• Engine water temperature gauge g: Inside green range
• Fuel gauge h: Inside green range
• Engine water temperature monitor i: OUT
• Radiator water level monitor j: OUT
• Engine oil pressure monitor k: OUT
• Charge level monitor l: OUT
• Fuel level monitor m: OUT
• Air cleaner clogging monitor n: OUT
• Engine pre-heating monitor o: OUT
• Engine oil level monitor p: OUT
• Hydraulic oil level monitor q: OUT
7. Check that there is no abnormal exhaust gas colour, noise, or vibration. If any abnormality is found, repair it.
i
m
j
k n l p o
g
h
q
2-52
PC340-ENG
8. Press working mode switch b on the monitor panel until the lamp of
the mode to be used lights up.
12. OPERATION
12.3.2 IN COLD AREAS (AUTOMATIC WARMING-UP
OPERA TION)
When starting the engine in cold areas, carry out the automatic
warming-up operation after starting the engine.
When the engine is started, if the engine water temperature is low
(below 30oC (86oF)), the warming-up operation is carried out automatically.
The automatic warming-up operation is cancelled if the engine water
temperature reaches the specified temperature (30oC (86oF)) or if the
warming-up operation is continued for 10 minutes. If the engine water
temperature or hydraulic oil temperature are low after the automatic
warming-up operation, warm the engine up further as follows.
NOTICE
• When the hydraulic oil is at a low temperature, do not carry out
operations or move the levers suddenly. Always carry out the
warming-up operation. This will help to extend the machine life.
• Do not suddenly accelerate the engine before the warming-up
operation is completed.
Do not run the engine at low idling or high idling continuously
for more than 20 minutes. This will cause leakage of oil from the
turbocharger oil supply piping. If it is necessary to run the engine at idling, apply a load from time to time or run the engine at
a mid-range speed.
H/O G/O F/O L/O B/O
1. Set fuel control dial a at the low idling (MIN) position and run the
engine for about 5 minutes without load.
PC340-ENG
2-53
12. OPERA TION
2. Press working mode switch b on the monitor panel until H.O (heavy
duty operation) mode lamp lights up.
3. Turn fuel control dial a to the mid-range speed position.
4. Set safety lock lever d to the FREE position and raise the bucket
from the ground.
H/O G/O F/O L/O B/O
5. Operate bucket control lever e and arm control lever f slowly to
move the bucket cylinder and arm cylinder to the end of their stroke.
6. Operate the bucket for 30 seconds and the arm for 30 seconds in
turn fully for 5 minutes.
REMARK
Turn swing lock switch c ON (ACTUATED) and operate the lever to
make the oil temperature rise more quickly.
NOTICE
When the work equipment is retraced, take care that it does not
interfere with the machine body or ground.
2-54
PC340-ENG
7. Turn fuel control dial a to the full speed (MAX) position and carry
out the operation is Step 6 for 3 -5 minutes.
8. Repeat the following operation 3 - 5 times and operate slowly.
• Boom operation RAISE vn LOWER
• Arm operation IN vn OUT
• Bucket operation CURL vn DUMP
• Swing operation LEFT vn RIGHT
• Travel (Lo) operation FOR WARD vn REVERSE
REMARK
If the above operation is not carried out, there may be a delay in
response when starting or stopping each actuator, so continue the operation until it becomes normal.
9. Use working mode switch b on the monitor panel to switch to the
working mode to be used.
12. OPERA TION
H/O G/O F/O L/O B/O
PC340-ENG
2-55
12. OPERA TION
NOTICE
Cancelling automatic warming-up operation
If it becomes necessary in an emergency to lower the engine
speed to low idling, cancel the automatic warming-up operation as
follows.
1. Turn fuel control dial a to the full speed (MAX) position and hold it
for 3 seconds.
2. When fuel control dial a is returned to the low idling (MIN) position,
the engine speed will drop.
2-56
PC340-ENG
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