PDF Operation & Maintenance Manual Komatsu PC300LC-7E0 PC300HD-7E0 Hydraulic Excavator - 1 MB
This manual is your essential guide to the proper operation and maintenance of the Komatsu PC300LC-7E0 and PC300HD-7E0 hydraulic excavators.
It provides crucial safety information, control explanations, and detailed schedules for routine maintenance.
Following the procedures outlined in this guide will help maximize your machine's performance and service life.
It is a vital resource for all operators and service personnel.
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--- Page 1 ---
CEAM005902
Operation & Maintenance
Manual
PC300LC-8
PC300HD-8
HYDRAULIC EXCAVATOR
PC300LC-8 A90001
SERIAL NUMBERS and UP
PC300HD-8 A87001
ENGINE SAA6D114E-3
This material is proprietary to Komatsu America Corp and is not to be reproduced, used, or disclosed except in accordance
with written authorization from Komatsu America Corp.
It is our policy to improve our products whenever it is possible and practical to do so. We reserve the right to make changes or
add improvements at any time without incurring any obligation to install such changes on products sold previously.
Due to this continuous program of research and development, periodic revisions may be made to this publication. It is
recommended that customers contact their distributor for information on the latest revision.
March 2010 Copyright 2010 Komatsu
Published in USA
Komatsu America Corp.
--- Page 3 ---
INTRODUCTION
Ensure Good Visibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
Signalman's Signal And Signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Asbestos Dust Hazard Prevention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Ventilation For Enclosed Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
SAFETY MACHINE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Starting Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Checks Before Starting Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Safety Rules For Starting Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
Starting Engine In Cold Weather . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
Starting With Booster Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
Checks Before Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
Safety Rules For Changing Machine Directions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
Safety Rules For Traveling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
Traveling On Slopes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
Operations On Slopes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
Prohibited Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
Operations On Snow Or Frozen Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
Parking Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
TRANSPORTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32
Loading And Unloading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32
Shipping The Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
TOWING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
Safety Rules For Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
LIFTING OBJECTS WITH BUCKET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
Safety Rules For Lifting Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
SAFETY MAINTENANCE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
Warning Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
Keep Work Place Clean And Tidy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
Select Suitable Place For Inspection And Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
Only Authorized Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
Appoint Leader When Working With Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-35
Stop Engine Before Carrying Out Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36
Two Workers For Maintenance When Engine Is Running . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37
Attachments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37
Precautions When Working At High Places . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37
Work Under The Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-38
Proper Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-38
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-39
Battery Hazard Prevention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-39
Starting Engine With Booster Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-40
When Using Hammer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-40
Burn Prevention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41
Hot Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41
Hot Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41
Safety Rules For High-pressure Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41
Precaution For High Fuel Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42
Safety Handling High-pressure Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42
Precaution For High Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42
PC300LC/HD-8 0-9
--- Page 4 ---
SAFETY
Safety Labels
1. Caution for operation, inspection and maintenance (09651-03001)
WARNING - Improper operation and maintenance can cause serious
injury or death. Read manual and labels before operation and
maintenance. Follow instructions and warnings in manual and in
labels on machine. Keep manual in machine cab near operator.
Contact Komatsu distributor for replacement manual.
2. Caution before operating (09802-03000)
WARNING - To prevent SEVERE INJURY or DEATH, do the
following before moving machine or its attachments:
• Honk horn to alert people nearby.
• Be sure no one is on or near machine or in swing area.
• Rotate cab for full view of travel path, if it can be done safely.
• Use spotter if view is obstructed.
Follow above even if machine is equipped with travel alarm and
mirrors.
3. Caution for leaving operator's seat (09654-03001)
WARNING - To avoid hitting unlocked operation levers, lower
equipment to ground and move SAFETY LOCK LEVER (located
near seat) to LOCK position before standing up from operator’s seat.
Sudden and unwanted machine movement can cause serious injury
or death.
PC300LC/HD-8 1-3
--- Page 5 ---
SAFETY
SAFETY INFORMATION
Safety Rules
• Only trained and authorized personnel can operate and maintain the machine.
• Follow all safety rules, precautions and instructions when operating or performing maintenance on the machine.
• If you are under the influence of alcohol or medication, your ability to safely operate or repair your machine may be
severely impaired putting yourself and everyone else on your jobsite in danger.
• When working with another operator or with a person on worksite traffic duty, be sure that all personnel understand all
hand signals that are to be used.
If Problems Are Found
If you find any problems in the machine during operation or maintenance (noise, vibration, smell, incorrect gauges, smoke, oil
leakage, etc., or any abnormal display on the warning devices or monitor), report to the person in charge and have the
necessary action taken. Do not operate the machine until the problem has been corrected.
Working Wear And Personal Protective Items
• Do not wear loose clothing and accessories. There is a hazard that they may catch on control levers or other protruding
parts.
• If you have long hair and it hangs out from your hard hat, there is a hazard that it may get caught up in the machine, so tie
your hair up and be careful not to let it get caught.
• Always wear a hard hat and safety shoes. If the nature of the work
requires it, wear safety glasses, mask, gloves, ear plugs, and safety
belt when operating or maintaining the machine.
• Check that all protective equipment functions properly before using
it.
Fire Extinguisher And First Aid Kit
Always follow the precautions below to prepare for action if any injury
or fire should occur.
• Be sure that fire extinguishers have been provided and read the
labels to ensure that you know how to use them in emergencies.
• Carry out periodic inspection and maintenance to ensure that the fire
extinguisher can always be used.
• Provide a first aid kit in the storage point. Carry out periodic checks
and add to the contents if necessary.
PC300LC/HD-8 1-13
--- Page 6 ---
SAFETY
SAFETY MACHINE OPERATION
Starting Engine
If there is a warning tag hanging from the work equipment control lever,
do not start the engine or touch the levers.
If there is any "DANGER! Do Not Operate!" warning tag (part number
09963-03001) displayed, it means that someone is carrying out
inspection and maintenance of the machine. If the warning sign is
ignored and the machine is operated, there is danger that the person car-
rying out inspection or maintenance may be caught in the rotating parts
or moving parts and suffer serious personal injury or death. Do not start
the engine or touch the levers.
Checks Before Starting Engine
Carry out the following checks before starting the engine at the beginning of the day's work.
• Remove all dirt from the surface of the window glass to ensure a good view.
• Remove all dirt from the surface of the lens of the working lamps, and check that they light up correctly.
• Check the coolant level, fuel level, and oil level in engine oil pan, check for clogging of the air cleaner, and check for
damage to the electric wiring.
• Adjust the operator's seat to a position where it is easy to carry out operations, and check that there is no damage or wear
to the seat belt or mounting clamps.
• Check the operation of the instruments and gauges, check the angle
of the mirror, and check that the control levers are all at the Neutral
position.
• Before starting the engine, check that lock lever (1) is in LOCK
position (L).
• Adjust the mirrors so that the rear of the machine can be seen clearly
from the operator's seat.
• When adjusting, See “Rear View Mirrors” on page 2-128.
• Adjust the rear-view camera so that the area to the rear of the
machine can be seen clearly from the operator's seat.
• For details of the method of adjustment, See “Adjusting Angle Of
Rear View Camera” on page 2-126.
• Check that there are no persons or obstacles above, below, or in the
area around the machine.
PC300LC/HD-8 1-23
--- Page 7 ---
SAFETY
Shipping The Machine
When shipping the machine on a trailer, do as follows.
• The weight, transportation height, and overall length of the machine differ according to the work equipment, so be sure to
confirm the dimensions.
• When passing over bridges or structures on private land, check first that the structure is strong enough to support the
weight of the machine. When traveling on public roads, check first with the relevant authorities and follow their
instructions.
• For details of the shipping procedure, See “TRANSPORTATION” on page 2-179.
TOWING
Safety Rules For Towing
Serious injury or death could result if a disabled machine is towed
incorrectly or if there is a mistake in the selection or inspection of the
wire rope.
For towing, See “Towing The Machine” on page 2-202.
• Always check that the wire rope used for towing has ample strength
for the weight of the machine being towed.
• Never use a wire rope which has cut strands (A), reduced diameter
(B), or kinks (C). There is danger that the rope may break during the
towing operation.
• Always wear leather gloves when handling wire rope.
• Never tow a machine on a slope.
• During the towing operation, never stand between the towing machine and the machine being towed.
• Operate the machine slowly and be careful not to apply any sudden load to the wire rope.
PC300LC/HD-8 1-33
--- Page 8 ---
SAFETY
Safety First 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 adjustment, grease drain plug (1) may fly out and cause
serious injury or property damage.
• When loosening grease drain plug (1) to loosen the track tension,
never loosen it more than one turn. Loosen the grease drain plug
slowly.
• Never put your face, hands, feet, or any other part of your body close
to grease drain plug (1).
Do Not Disassemble Recoil Springs
Never attempt to disassemble the recoils spring assembly. It contains a
spring under high pressure which serves as a shock absorber for the idler.
If it is disassembled by mistake, the spring will fly out and cause serious
injury. When it becomes necessary to disassemble it, ask your Komatsu
distributor to do the work.
PC300LC/HD-8 1-43
--- Page 9 ---
OPERATION
Remark
When the engine is started, the battery voltage may suddenly drop depending on the temperature and the bat-
tery condition. If this happens, the display on the machine monitor may momentarily go out, but this does not
indicate any abnormality.
Stopping Engine When Situation Is Normal
• When the starting switch is turned to the OFF position, ending screen JJ is displayed for 5 seconds, then the display goes
out.
PC300LC/HD-8 2-7
--- Page 10 ---
OPERATION
Engine Oil Level Monitor
Monitor (2) warns the operator that the oil level in the engine oil pan has
dropped.
If oil level in the engine oil pan is low, the lamp lights up red, so check
the oil level, and add oil.
Maintenance Interval Monitor
This monitor (3) lights up when the maintenance time gets close and
remains lighted after the maintenance time has already passed.
• Lighted yellow: The maintenance time is due within 30 hours.
• Lighted red: The maintenance time has already passed.
This monitor lights up when the starting switch is turned to the ON
position. It goes off after 30 seconds and the display changes to the
normal screen.
Remark
For details of the method of confirming the maintenance
interval, See “Maintenance Selector Switch” on page 2-42.
If it is desired to change settings for the maintenance interval, have your Komatsu distributor change the
settings.
PC300LC/HD-8 2-17
--- Page 11 ---
OPERATION
• For machines ready for attachment, the attachment mode is added to the display.
For details of the method for handling machines ready for attachment, See “OPTIONS, ATTACHMENTS” on page 5-1.
• When the monitor starts up, if the working mode setting is B mode,
the confirmation message on the right is displayed and the buzzer
sounds.
• When starting up and staying in B mode, always press function
switch F6 (Yes).
• If you press F5 (No), the system starts up in E mode.
• If you want to have automatic setting of the P, E, L, B or ATT mode when starting (optional default setting), please ask
your Komatsu distributor to change the setting.
PC300LC/HD-8 2-27
--- Page 12 ---
OPERATION
Operation Of Image Display Screen When Two Camera Screens Are Shown Simultaneously.
The following explanation describes the method of operation when it is desired to display two camera screens at the same time
on the monitor.
• On the No. 1 camera image display screen, if switch F4 is pressed,
No. 1 camera image (d) and No. 2 camera image (e) are displayed.
• Even if three cameras are installed, only the images from the No. 1
camera and No. 2 camera can be displayed at the same time.
• When two screens are displayed at the same time, the display
changes more slowly than when only one screen is displayed.
• Press switch F5 to return to the standard screen.
PC300LC/HD-8 2-37
--- Page 13 ---
OPERATION
Breaker/attachment Setting
• On machines ready for attachment, it is possible on the breaker/
attachment setting menu to adjust the oil flow in B mode and ATT
mode to match the attachment.
For machines that have no attachment, the breaker/attachment set-
ting mode is not displayed.
Changing Breaker Mode Setting
1. On the standard screen, press switch F6.
2. Select Breaker/Attachment Settings on the user menu, then press
switch F6.
PC300LC/HD-8 2-47
--- Page 14 ---
OPERATION
Changing Attachment Flow Setting
1. Select 2-Way Attachment Oil Flow Setting (b) on the 2-Way
Attachment Select menu screen, then press switch F6.
2. On the 2-Way Attachment Select Oil Flow Setting screen, select one
of the two set values for the oil flow, then press switch F6.
• The default values for the oil flow setting are both set to 530
liters/min, as shown in the illustration on the right.
The present oil flow set for ATT mode is marked with ATT in
front of the item.
• “No 2-Way Attachment” cannot be selected
PC300LC/HD-8 2-57
--- Page 15 ---
OPERATION
3. On the clock adjustment selection screen, it is possible to carry out
the following operations with switches F3 to F6.
• Time
Adjust the hour setting.
a. If “Time” (a) is not highlighted in yellow, press switch F6 to
highlight “Time” (a) in yellow. When this is done, hour display
(b) changes to orange.
Adjust hour display (b) with the switches as follows. If it is not
necessary to change the hour setting, press switch F6.
F3: Time advances 1 hour.
F4: Time goes back 1 hour.
F5: Cancels change and returns to user menu.
F6: Accepts change and goes to setting for minutes.
PC300LC/HD-8 2-67
--- Page 16 ---
OPERATION
REVOLVING WARNING LAMP SWITCH
(If equipped)
Use this switch (8) to light up the yellow rotating lamp on top of the cab.
(a) ON: Lamps light up
(b) OFF: Lamps go off
HORN SWITCH
Use this switch (9) to sound the horn.
Press the switch on the right work control lever to sound the horn.
ONE-TOUCH POWER MAX. SWITCH
This switch (10) on the left work equipment control lever is used to
actuate the power max functions.
Press once (single click) and keep the switch pressed. The one-touch
power max. function is actuated for a maximum of 8.5 seconds at P and E
mode.
CIGARETTE LIGHTER
This switch (11) is used when lighting cigarettes.
When the cigarette lighter is pushed in, it will return to its original
position after several seconds, so pull it out to use it.
If the cigarette lighter is removed, the socket can be used as an 85W (24V
x 3.5A) power source.
Remark
This cigarette lighter is for 24V. Do not use it as the power
source for 12V equipment.
PC300LC/HD-8 2-77
--- Page 17 ---
OPERATION
Removing Lower Windshield
1. Open the front window, then hold grip (1), pull up, and remove the
bottom window.
• If sand or dust is collected at the bottom of the front window, it will
be difficult to remove the window. In addition, when stowing, the
sand and dust stuck to the glass will be carried inside the cab. To
prevent this, clean area (A) before removing.
2. After removing the lower windshield, store it at the right rear of the
operator's cab, and set lever (2) to lock position (B) to hold it
securely in position.
3. When removing it, set lever (2) to release position (C), hold the glass
with both hands, and pull it up.
PC300LC/HD-8 2-87
--- Page 18 ---
OPERATION
Method Of Operation
The air conditioner can be operated automatically or manually. Select the
method of operation as desired.
Automatic Operation
1. Turn auto switch (5) ON.
• The monitors for the set temperature (a) and air flow (b) are also
displayed.
2. Use temperature set switch (3) to set to the desired temperature. The
air flow, combination of vents, and selection of fresh or recirculated
air is automatically selected according to the set temperature, and the
air conditioner is operated automatically to provide the set
temperature.
Remark
When vent display monitor (c) displays (d) or (e), and engine
coolant temperature is low, the air flow is automatically limited
to prevent cold air from blowing out.
PC300LC/HD-8 2-97
--- Page 19 ---
OPERATION
Controls Of Radio
Method of Setting with Preset Button
1. Press power switch (1) and display the frequency on display (7).
2. Use tuning button (9) to set to the desired frequency. There are two
methods for tuning: auto tuning and manual tuning.
3. With the display (7) showing the desired frequency, keep the desired
Preset button No pressed for at least 1.5 seconds. The reception
sound will disappear, but when the presetting operation (saving to
memory) is completed, the sound will appear again and the Preset
No and frequency will be shown on the display to show that the
presetting operation has been completed.
After completing the presetting, press Preset button (6) and release it
within approx. 1.5 seconds. This will make it possible to receive the channel preset to that button. One channel each for
AM and FM can be preset to each Preset button.
Remark
It is also possible to save to the Preset button by using the auto store button.
Method of Tuning
1. Press power switch (1) and display the frequency on display (7).
2. Use tuning button (9) to set to the desired frequency. There are two methods for tuning: auto tuning and manual tuning.
• Manual tuning
Press tuning button (9) until the frequency is displayed on display (7).
< button: Frequency moves down
> button: Frequency moves up
When the frequency reaches the top or bottom frequency, it automatically continues as follows: Top ➡ Bottom, or
Bottom ➡ Top.
• Auto tuning
Press tuning button (9) for at least 3 seconds. When a station is picked up, the tuning automatically stops. To search for the
next station, press the tuning button again for at least 3 seconds.
< button: Frequency moves down
> button: Frequency moves up
If this button is pressed during auto tuning, the auto tuning will be cancelled and the setting will return to the frequency in
use before the button was pressed.
PC300LC/HD-8 2-107
--- Page 20 ---
OPERATION
Check for Water and Sediment in Water Separator, Drain
Water
1. Open the cover on the right side of the machine.
• The water separator forms one unit with fuel pre-filter (1).
2. It is possible to judge the water level and amount of sediment by
looking through transparent cap (2). If there is any water or
sediment collected at the bottom, set a container to catch the drain
water under drain hose (3).
3. Loosen drain valve (4) and drain the water.
4. When fuel starts to drain from drain hose (3), tighten drain valve (4)
immediately.
On this machine, a sensor is installed to detect if water is accumulated in
transparent cap (2).
When the water separator monitor (5) lights up red on the machine
monitor, it indicates that water is accumulated in transparent cap (2).
In this case also, use the procedure above to drain the water.
Remark
When only the water separator monitor lights up, it lights up in
the position shown in the diagram on the right.
If other monitors also light up the same time, the water
separator monitor lights up at a different position.
Remark
If the water accumulated in transparent cap (2) freezes, the
water separator monitor may not light up. After the engine is started, as the temperature around fuel pre-filter
(1) increases, the frozen water will melt and the water separator monitor may suddenly light up. In cold areas,
even if the water separator monitor does not light up, drain the water frequently.
If the water inside transparent cap (2) freezes, check that the frozen water has melted completely, then use the
procedure above to drain the water.
Remark
If transparent cap (2) is dirty or it is difficult to see the inside, clean transparent cap (2) when replacing fuel
pre-filter cartridge (1).
When the drain valve (4) has been removed during the cleaning operation, coat the O-ring with grease and
tighten until it contacts the bottom.
PC300LC/HD-8 2-117
--- Page 22 ---
OPERATION
4. Loosen mounting bolt (4) of the camera and adjust mounting angle
(A) of the camera so that the center line of mounting bolt (4) is
aligned with fourth-from-bottom scale (B).
Remark
Part of the machine is shown on the monitor screen.
5. After adjusting, tighten bolt (4).
Torque: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 N•m ( 2.2-3.6 lb ft)
6. Install covers (1) and (2).
PC300LC/HD-8 2-127
--- Page 23 ---
OPERATION
After Starting Engine
• To stop the engine in emergencies or when the actuation
of the engine is abnormal or there is any other trouble,
turn the key in the starting switch to the OFF position.
• Do not carry out operations or operate the levers or
pedal suddenly while the hydraulic oil is at low
temperature.
• Always carry out the warm-up operation for the hydraulic
system until the hydraulic oil temperature monitor
indicates that the hydraulic oil has reached the operating
temperature range.
• Hydraulic oil temperature indicator
(A) Display when temperature is within operating range:
Monitor background (C) is blue
• (B) Display when temperature is low: Monitor
background (C) is white
• Hydraulically activated equipment may be affected if the
warm-up process is not carried out completely. The
effect may result in delayed control functions causing
sluggish and/or jerky operation of the boom, arm,
bucket, swing, and travel operations. Do not attempt
normal machine operations until the hydraulic
temperature indicator shows a blue background
(described above as item (A)).
There are two types of warm-up operations for the machine: 1) engine and 2) hydraulic system.
The warm-up process may differ depending on the environment that the machine is in (ex. method and time required). Always
carry out both warm-up operations according to the steps given in the appropriate sections of this manual.
Separate processes must be carried out to ensure that both the engine and hydraulic system are warmed-up and ready for
operation.
Breaking-in the New Machine
Remark
Your Komatsu machine has been thoroughly adjusted and tested before shipment from the factory. However,
operating the machine under full load before breaking the machine in can adversely affect the performance
and shorten the machine life.
Be sure to break in the machine for the initial 100 hours (as indicated on the service meter).
Make sure that you fully understand the content of this manual, and pay careful attention to the following points when
breaking in the machine.
• Run the engine at idle for 15 seconds after starting it. During this time, do not operate the control levers or fuel control
dial.
• Idle the engine for 5 minutes after starting it up.
• Avoid operation with heavy loads or at high speeds.
• Immediately after starting the engine, avoid sudden starts, sudden acceleration, unnecessary sudden stops, and sudden
changes in direction.
PC300LC/HD-8 2-137
--- Page 24 ---
OPERATION
C. L mode
For operations requiring fine control
D. B mode
For breaker operations
E. ATT mode
For operations with crusher or other double-acting action
attachment
PC300LC/HD-8 2-147
--- Page 25 ---
OPERATION
If the work equipment control levers are returned to the neutral position when the machine is stopped, even if the fuel control
dial is set to FULL, the auto-deceleration mechanism will act to reduce the engine speed to a mid-range speed.
Remark
The control circuit on this machine is equipped with an accumulator. Even if the engine is stopped, if the
starting switch key is turned to the ON position within 15 seconds after stopping the engine, and the lock lever
is set to the FREE position, it is possible to use the lever operation to lower the work equipment to the ground.
This procedure can also be used for releasing the remaining pressure in the hydraulic cylinder circuits or for
lowering the boom after loading the machine onto a trailer.
PC300LC/HD-8 2-157
--- Page 26 ---
OPERATION
Traveling On Slopes
• Turning or operating the work equipment when working
on slopes may cause the machine to lose it balance and
turn over, so avoid such operations.
It is particularly dangerous to swing downhill when the
bucket is loaded.
If such operations have to be performed, pile soil to
make a platform (A) on the slope so the machine is kept
horizontal during operation.
• Do not travel up or down steep slopes. There is a danger
that the machine may turn over.
• When traveling, raise the bucket approximately 20 to 30
cm (8 to 12 in) from the ground.
• Do not travel downhill in reverse.
• Never turn on slopes or travel across slopes.
• Always go down to a flat place to perform these
operations. It may be longer, but it will ensure safety.
• Always operate or travel in such a way that it is possible
to stop safely at any time if the machine slips or
becomes unstable.
• When traveling uphill, if the shoes slip or it is impossible
to travel uphill using only the force of the tracks, do not
use the pulling force of the arm to help the machine