Operations Before Starting Engine

WARNING

When starting the engine, check that the lock lever is securely at the LOCK position.

If the lock lever is not locked securely and the control levers or control pedal are touched when the engine is started, the machine may move unexpectedly, and this may lead to serious personal injury.

1. Check that lock lever (1) is at the LOCK position (L).

2. Check that each control lever and control pedal is at the Neutral position.

If the control levers and control pedal are not being touched, they will be at the Neutral position.

3. Insert the key in starting switch (2), turn the key to the ON position (B), then carry out the following checks.

If a password has been set, the input display screen will be displayed on the monitor screen.

After inputting the password, press Enter switch F6 (3).

REMARK

For details of the method of setting, changing, or canceling the password, see separate "PROCEDURE FOR SETTING,

OPERATION

OPERATION

1) The buzzer sounds for approx. 2 seconds, then the monitor or meter lights up for approx. 2 seconds.

Radiator coolant level monitor (4) Charge level monitor (5)

Engine oil pressure monitor (6) Engine oil level monitor (7) Air cleaner clogging monitor (8) Water separator monitor (9)

Engine coolant temperature gauge (10)

If any monitor does not light up or the buzzer does not sound, there is probably a failure in the monitor, so please contact your Komatsu distributor for repairs.

2) After approx. 2 seconds, the screen will change to the working mode/travel speed display monitor. Next, it will switch to the standard screen.

Engine coolant temperature gauge (10) Engine coolant temperature monitor (11) Fuel gauge (12)

Fuel level monitor (13)

Hydraulic oil temperature gauge (14) Hydraulic oil temperature monitor (15)

3) If the hydraulic oil temperature gauge is out or caution lamp (16) stays lighted up red, immediately check the item that lights up red.

4) If the maintenance interval has passed, maintenance interval monitor (17) lights up for 30 seconds. Press maintenance switch F5 (18), check the item, and carry out maintenance immediately.

For details of the method of checking the maintenance interval, see "Maintenance Selector Switch (PAGE 3-42)"

in the explanation for each component.

STARTING ENGINE

WARNING

Start the engine only after sitting down in the operator's seat.

Do not attempt to start the engine by short-circuiting the engine starting circuit. Such an act may cause a serious bodily injury or fire.

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

Before starting the engine, check that fuel control dial (2) is at the low idling (MIN) position. If the fuel control dial is at the full speed (MAX) position, the engine will accelerate suddenly and cause damage to the engine parts.

Do not keep the key in starting switch (3) at the START position continuously for more than 20 seconds.

If the engine does not start, wait for at least 2 minutes, then start again from the beginning.

After the engine starts, wait for the engine oil pressure monitor to go out. Do not touch the control levers or control pedal while the engine oil pressure monitor is lighted up.

This machine is equipped with an engine automatic preheating device that functions to start the engine preheating automatically.

If the ambient temperature is low, the preheating monitor will light up when the key in starting switch (3) is turned to the ON position to inform the operator that preheating has been started automatically.

1. Check the lock lever (1) is in the LOCK position (L). If the lock lever is in the FREE position (F), the engine does not start.

2. Set fuel control dial (2) to the low idling (MIN) position.

OPERATION

OPERATION

3. Turn the key in starting switch (3) to ON position (B).

If the ambient temperature is low, the preheating monitor lights up and automatic preheating is carried out. Keep the key in starting switch (3) at the ON position until the preheating monitor goes out.

The time that the preheating monitor stays lighted up depends on

the ambient temperature as shown in the table on the right. Ambient temperature Lighting time -4 °C to -15 °C 5 seconds

to 30 seconds -15 °C or less 30 seconds 4. If the preheating monitor does not light up, or it lights up and

then goes out to inform that the engine preheating has been completed, turn the key in starting switch (3) to the START position (C) and start the engine.

REMARK

If the ambient temperature is low, the engine may not start even when the key in the starting switch (3) is kept at the START position for 20 seconds. If this happens, wait for at least 2 minutes, then start again from the beginning.

5. After the engine starts, release the key in starting switch (3).

The key will automatically return to the ON position (B).

REMARK

When the engine is started, depending on the ambient temperature or the condition of the battery, the battery voltage may suddenly drop.

If this happens, the display on the machine monitor will momentarily disappear, but this does not indicate any

6. Even if the engine starts, wait for the engine oil pressure monitor to go out. Do not touch the control levers or control pedal while the engine oil pressure monitor is lighted up.

NOTICE

If the engine oil pressure monitor does not go out even after 4 to 5 seconds have passed, stop the engine immediately. Check the oil level, check for leakage of oil, and take the necessary action.

REMARK

Regardless of the ambient temperature, it is possible to start the engine preheating manually.

1. Turn the key in starting switch (3) to the left from OFF position (A). The preheating monitor lights up and engine preheating starts.

(Preheating continues while the key in starting switch (3) is held at the left position.)

2. The preheating monitor starts lighting about 30 seconds after preheating starts and then goes off in about 10 seconds.

3. After the preheating monitor goes off, turn the key in starting switch (3) to START position (C). The engine will start.

If the engine cannot be started with the above procedure, wait for at least two minutes, then start again from Step 1.

Turbo protect function

The turbo protect function is a function to protect the turbocharger by keeping the engine speed at less than 1000 rpm immediately after the engine is started.

When the turbo protect function is actuated, the engine speed is held at less than 1000 rpm, regardless of the position of the fuel control dial.

When the turbo protect function is actuated, the engine speed is held at less than 1000 rpm, even if the fuel control dial is operated.

When the turbo protect function is canceled, the engine speed is set to the speed for the position of the fuel control dial.

The relationship between the length of time of actuating the turbo protect function and the temperature of the engine coolant is as shown in the table.

Coolant

OPERATION