STARTING ENGINE

Normal Starting

WARNING

● Check that there are no persons or obstacles in the surrounding area, then sound the horn and start the engine.

● Exhaust gas is toxic. When starting the engine in confined spaces, be particularly careful to ensure good ventilation.

Notice

Do not crank the starting motor continuously for more than 20 seconds.

If the engine does not start, wait for at least 2 minutes before trying again.

2.Set FRONT engine fuel control dial (2) at the low idling (MIN) position.

If it is at the high idling (MAX) position, always change it to the low idling (MIN) position.

3.Turn the key in starting switch (3) to the START position. The FRONT engine will start.

4.When the engine starts, release the key in starting switch (3). The key will return automatically to the ON position.

5.Set starting selector switch (1) to the rear engine position, turn fuel control dial (4) for the rear engine to the low idling (MIN) position, then turn starting switch (3) from the ON position to the START position. The rear engine will start.

6.After the engine starts, release the key in starting switch (3). The key will automatically return to the ON position.

Starting Engine In Cold Weather

When starting in low temperatures, do as follows.

Warning

● Check that there are no persons or obstacles in the surrounding area, then sound the horn and start the engine.

● Never use starting aid fluids as they may cause explosions.

● Exhaust gas is toxic. When starting the engine in confined spaces, be particularly careful to ensure good ventilation.

Notice

● Do not crank the starting motor continuously for more than 20 seconds. If the engine does not start, wait for at least two minutes, return HEAT switch (6) to the OFF position, then repeat Steps 3 to 6.

● On this machine, to protect the turbocharger, a turbo protect function is provided. In cold weather, even if fuel control dial (1) is operated immediately after starting the engine, the engine speed may not change for several seconds.

Remark

There are 10 notches for the dial rotation, and the click can be felt by hand.

3.Hold HEAT switch (6) at the ON position. When the HEAT switch is released, it will automatically return to the OFF position.

4.Check that preheating monitor (5) lights up. After about 30 seconds, preheating monitor lamp (5) will flash for about 10 seconds to indicate that preheating is finished.

When the preheating switch is released, it will go off automatically.

Remark

● The monitors and gauges will light up also when the key is turned to the HEAT position, but this is not an abnormality.

5.When preheating monitor (5) goes out, turn the key in starting switch (3) to the START position to start the FRONT engine.

6.When the engine starts, release the key in starting switch (3). The key will return automatically to the ON position.

7.Set starting selector switch (1) to the rear engine, check that fuel control dial (4) for the rear engine is 3 notches from the low idling (MIN) position, then carry out Steps 3 to 4.

8.When the preheating monitor (5) starts to flash, turn starting switch (3) from the ON position to the START position. The rear engine will start.

9.When the engine starts, return the key in the starting switch to the ON position. When the switch is released, it will automatically return to the ON position.

Remark

● The actuation time for the turbo protect function and the relationship with the engine coolant temperature are as shown below.

If the fuel control dial is operated within the time shown below, the engine speed will not change.

Cooling water temperatureTurbo protect time (sec.)

+10°C above0

+10 to –10°CChange 0 to 5

–10°C below5

● In cold weather, the turbo protect function is actuated, so the engine speed is maintained below 1000 rpm for several seconds. After that, the automatic warming-up function raises the engine speed to 1200 rpm.

After Starting Engine

● Emergency stop

Warning

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.

BREAKING-IN THE NEW MACHINE CAUTION

Your Komatsu machine has been thoroughly adjusted and tested before shipment. However, operating the machine under severe conditions at the beginning can adversely affect the performance and shorten the machine life.

Be sure to running-in the machine for the initial 100 hours (as indicated by the service meter). During running-in operations, follow the precautions described in this manual.

● Run the engine at idling 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.

● Avoid sudden starts, sudden acceleration, sudden steering and sudden stops except in cases of emergency.

WARMING-UP OPERATION 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 not only pollute the surrounding environment, but also have an adverse effect on the turbocharger and internal parts of the engine.

If it is necessary to run the engine at idling (oil down), apply a load from time to time or run the engine at a mid-range speed.

● The hydraulic oil temperature should ideally lie within the range 50 to 80°C. If the machine is operated after raising the oil temperature to 20°C, the life of the machine will be extended.

REMARK

● If the engine water temperature is above 30°C, to protect the turbocharger, the engine speed does not rise for 2 seconds after starting, even if the fuel control dial is turned.

● If the hydraulic oil temperature is low, the hydraulic oil temperature monitor display will be white.

After starting the engine, do not immediately start operations. First, carry out the following operations and checks.

1.Turn fuel control dials (2) and (4) to the center position between LOW IDLING and HIGH IDLING 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 (6) until the heavy-duty operation mode lamp is turned on.

3.Press the START side (a) of greasing switch (5) and grease the work equipment and swing circle. Release the switch and carry out greasing for 15 minutes. During this time, the lamp at the center (c) of the switch lights up.

● When the switch is released, it is automatically reset.

● To stop during the operation, press STOP side (b) of switch (5).

4.Carry out greasing around the bucket. The greasing around the bucket is not carried out automatically, so operate the grease gun by hand. For details of greasing the bucket, see “EVERY 10 HOURS MAINTENANCE (PAGE 4-56)” and for details of greasing with the grease gun, see “HANDLING GREASE PUMP AND GREASE GUN (PAGE 3-97)”.

5.Set safety lock lever (7) to the FREE position, and raise the bucket from the ground.

6.Operate bucket control lever (8) and arm control lever (9) slowly to move the bucket cylinder and arm cylinder to the end of the stroke.

7.Carry out bucket and arm operation for 5 minutes at full stroke, alternating between bucket operation and arm operation at 30 second intervals.

Notice

When the work equipment is retracted, take care that it does not interfere with the machine body or ground.

8.After carrying out the warming-up operation, check that each gauge and monitor lamp is in the following condition.

● Radiator water level monitor (3): OUT

● Engine oil level monitor (4): OUT

● Hydraulic oil level monitor (5): OUT

● Charge level monitor (6): OUT

● Fuel level monitor (7): OUT

● Engine water temperature hydraulic oil temperature monitor (8): OUT

● Engine oil pressure monitor (9): OUT

● Engine water temperature gauge (10): Inside green range

● Fuel gauge (11): Inside green range

● Engine pre-heating monitor (12): OUT

● Air cleaner clogging monitor (13): OUT

● Hydraulic filter clogging monitor (14): OUT

9.Check that there is no abnormal exhaust gas color, noise, or vibration. If any abnormality is found, repair it.

10.Press working monitor mode switch (6) until required operation mode lamp is turned on.

IN COLD AREAS (AUTOMATIC WARMING-UP OPERATION)

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 30°C), the warming-up operation is carried out automatically.

The automatic warming-up operation is canceled if the engine water temperature reaches the specified temperature (30°C) 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

● Never carry out operations or operate the levers suddenly when the hydraulic oil is still at low temperature. Always continue the warming-up operation until the work equipment monitor display is green. This will extend the service life of the machine.

● 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.

Remark

If the hydraulic oil temperature is low, the hydraulic oil temperature monitor display will be white.

1.Set fuel control dial (2) and (4) to the low idling (MIN) position and run the engine for about 5 minutes without load.

2.Press working mode switch (6) on the monitor panel until the H.O (heavy-duty operation) mode lamp lights up.

3.Turn fuel control dial (2) and (4) to the medium speed position.

4.Set safety lock lever (7) to the FREE position, and raise the bucket from the ground.

5.Operate bucket control lever (3) and arm control lever (4) 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.

NOTICE

When the work equipment is retracted, take care that it does not interfere with the machine body or ground.

7.Turn fuel control dials (2) an (4) to the full speed (MAX) position and carry out the operation is Step 6 for 3 to 5 minutes.

8.Repeat the following operation 3 to 5 times and operate slowly.

Boom operation RAISE ↔ LOWER

Arm operation IN ↔ OUT

Bucket operation CURL ↔ DUMP

Swing operation LEFT ↔ RIGHT

Travel (Lo) operation FORWARD ↔ REVERSE

REMARK

In 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 (6) on the monitor panel to select the working mode to be used.

Notice

Canceling 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 dials (2) and (4) to the full speed (MAX) position and hold it for 3 seconds.

2)When fuel control dials (2) and (4) is returned to the low idling (MIN) position, the engine speed will drop.

Stopping The Engine

Normal Stopping Notice

If the engine is abruptly stopped before it has cooled down, engine life may be greatly shortened. Consequently, do not abruptly stop the engine apart from an emergency. In particular, if the engine has overheated, do not abruptly stop it but run it at mediumspeed to allow it to cool gradually, then stop it.

1.Run the engine at low idling speed for about 5 minutes to allow it to gradually cool down.

2.Turn the key in starting switch (1) to the OFF position and stop the engine.

3.Remove the key from starting switch (1).

Stopping In Emergencies

Operation To Stop Engine From Ground Level Notice

Use the engine stop switch (1) and fuel cut knob (2) only when stopping the engine in emergencies. When stopping the engine normally, follow the procedure in “STOPPING MACHINE (PAGE 3-143)”.

Use fuel cut knob (2) and engine stop switch (1) installed at the side of the steps on the left side of the machine to stop the engine.

1.Press the red engine stop switch (1). Engine stop switch (1) is moved to pushed-in position (a) and the engine stops. (a): Engine stop position (b): Engine stop cancel position

NOTICE

If the engine does not stop even when engine stop switch (1) is pushed in, there is a failure (burn-out, etc.) in the electrical circuit. Go immediately to Step 2 and cut the fuel to stop the engine.

2.After removing lock wire (3) from fuel cut knob (2), pull fuel cut knob (2) towards you. The engine will stop after approx. 3 - 5 minutes.

Remark

The engine will stop even when the fuel cut operation is carried out independently with fuel cut knob (2), but engine emergency stop lamp (4) will not light up.

When starting again after stopping the engine, do as follows.

1.After pushing fuel cut knob (2) back to its original position, fit lock wire (3) to fuel cut knob (2) to lock fuel cut knob (2) and prevent it from moving.

2.Press engine stop switch (1). When it is pressed, engine stop switch (1) will spring out several millimeters and be reset to position (b).

(a): Engine stop position

(b): Engine stop cancel position

3.Check that engine emergency stop lamp (4) on the panel on the right side of the operator's seat inside the cab is OFF when the starting switch is set to the ON position.

Use the procedure in STARTING ENGINE (PAGE 3-124) when starting the engine.

Engine Stop Operation Inside Engine Room

NOTICE

Engine stop switch (5) inside the engine room is mainly used to prevent the engine from being started from inside the cab when inspection and maintenance are being carried out inside the engine room. Normally, set engine stop switch (5) to engine stop cancel position (b). When this is done, lamp (6) goes out.

Press engine stop switch (5) installed at the side of the steps in the center of the engine room to set it to engine stop position (a).

Engine stop switch (5) stays pushed in. When this happens, lamp (6) lights up red regardless of the operation of the starting switch.

(a): Engine stop position

(b): Engine stop cancel position

In this condition,

● Even if the starting switch is turned to the START position, the engine will not start.

● If the engine is running, it will stop.

1.Press engine stop switch (5). When it is pressed, engine stop switch (5) will spring out several millimeters and be reset to position (b).

(a): Engine stop position

(b): Engine stop cancel position

2.Check that engine emergency stop lamp (4) on the panel on the right side of the operator's seat inside the cab is OFF when the starting switch is set to the ON position. Use the procedure in “STARTING ENGINE (PAGE 3124)” when starting the engine.

Check After Shut Off Engine

1.Walk around the machine and check the work equipment, machine exterior, and undercarriage, and check also for leakage of oil or water. If any abnormalities are found, repair them.

2.Fill the fuel tank.

3.Check the engine compartment for paper and debris. Clean out any paper and debris to avoid a fire hazard.

4.Remove any mud affixed to the undercarriage.

Machine Operation

Preparations For Moving The Machine Off

Warning

● Before operating the steering levers, check the direction of the track frame. If the sprocket is at the front, the operation of the travel levers is reversed.

● When moving off, check that the area around the machine is safe, and sound the horn before moving.

● Do not allow anyone in the area around the machine.

● Remove all obstacles from the travel path of the machine.

● The rear of the machine is a blind spot, so be particularly careful when travel in reverse.

● If the lever is moved inside the deceleration range, engine speed will rise suddenly. Operate the levers carefully.

● For machines equipped with a travel alarm (if equipped), check that the warning equipment works properly.

1.Set swing lock switch (1) to the ON (actuated) position and confirm that swing lock monitor lamp (2) lights up.

2.Turn fuel control dial (3) towards the full speed position to increase the engine speed.

Moving Machine Forward

1.Set safety lock lever (4) in the FREE position, fold the work equipment, and raise it 40 to 50 cm from the ground.

2.Operate right and left travel levers (5) or right and left travel pedals (6) as follows.

● When the sprocket (A) is at the rear of the machine

Push levers (5) forward slowly or depress the front part of pedals (6) slowly to move the machine off.

● When the sprocket (A) is at the front of the machine

Pull levers (5) backward slowly or depress the rear part of pedals (6) slowly to move the machine off.

3.For machines equipped with a travel alarm, check that the alarm sounds. If the alarm does not sound, please contact your Komatsu distributor for repairs.

Moving Machine Backward

1.Set safety lock lever (4) in the FREE position, fold the work equipment, and raise it 40 to 50 cm from the ground.

2.Operate right and left travel levers (5) or right and left travel pedals (6) as follows.

● When the sprocket (A) is at the rear of the machine

Pull levers (5) backward slowly or depress the rear part of pedals (6) to move the machine off.

● When the sprocket (A) is at the front of the machine

Push levers (5) forward slowly or depress the front part of pedals (6) to move the machine off.

3.For machines equipped with a travel alarm, check that the alarm sounds. If the alarm does not sound, please contact your Komatsu distributor for repairs.

Stopping Machine

Warning

Avoid stopping suddenly. Give yourself ample room when stopping.

1.Put the left and right travel levers (1) in the neutral position, then stop the machine.

Steering The Machine

Steering

WARNING

Before operating the travel levers, check the position of the sprocket. If the sprocket is at the front, the operation of the travel levers is reversed.

Use the travel levers to change direction.

Avoid sudden changes of direction as far as possible. In particular, when carrying out counter-rotation (spin turn), stop the machine first before turning.

Operate two travel levers (1) as follows.

Steering The Machine When Stopped

When turning to the left:

Push the right travel lever forward to turn to the left when traveling forward; and pull it back to turn left when traveling in reverse.

REMARK

When turning to the right, operate the left travel lever in the same way.

Turning left when travelling forward

Turning left when travelling reverse

Changing Direction Of The Machine

When turning to the left:

If the left travel lever is returned to the neutral position, the machine will turn to the left.

REMARK

When turning to the right, operate the right travel lever in the same way.

Turning left when travelling forward

Turning left when travelling in reverse

COUNTER-ROTATION TURN (SPIN TURN)

When using counter-rotation (spin turn) to turn left, pull the left travel lever back and push the right travel lever forward.

REMARK

When using counter-rotation to turn right, pull the right travel lever back and push the left travel lever forward.

Swinging

Warning

● The rear of the machine extends outside the track width. Check that the surrounding area is safe before swinging be upper structure.

● Check that swing lock monitor (2) is not lighted up.

● If the swing control lever is operated quickly, the upper structure will move quickly; if it is operated slowly, the upper structure will move slowly.

1.Before starting the swing operation, turn swing lock switch (1) OFF and check that swing lock monitor (2) has gone out.

2.Operate left work equipment control lever (3) to operate the swing.

3.When not using the swing, turn swing lock switch (1) ON. Check that swing lock monitor (2) lights up.