CONTROLLER (COMPUTER)

The front and rear governors, pump controllers, and VHMS controllers are installed inside the room under the cab.

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 consult your Komatsu distributor.

Engine controller (1) is under the line filter hose found when the second side door from the left of the machine is opened.

● When removing the engine controller, do as follows.

1.Turn the starting switch OFF, wait for at least 3 minutes, then remove the negative (–) terminal of the battery.

2.Remove the positive (+) terminal of the battery.

Remark

The engine controller is cooled by the air conditioner cooler. To prevent any drop in the cooling function, check before starting operations that the cooling hoses have not come out, are not cracked, and that the clamps are not loose.

Pump controller (2) is inside the cab room.

● When removing the pump controller, do as follows.

1.Turn the starting switch OFF, wait for at least 3 minutes, then remove the negative (–) terminal of the battery.

2.Remove the positive (+) terminal of the battery.

3.VHMS controller

VHMS controller (3) is on the right side of pump controller (2) inside the room under the cab.

● When removing the VHMS controller, do as follows.

1.Turn the starting switch OFF, wait for at least 3 minutes, then remove the C01 connector of the VHMS controller.

2.Remove the other connectors.

Toolbox

This is inside the room under the cab.

Handling Grease Pump And Grease Gun

Method Of Use

Run the front engine at a mid-range speed when carrying out greasing with grease gun (1).

1.Press the greasing switch at the right side of the operator's seat inside the cab to start position (a), then release it.

● Greasing can be carried out for 15 minutes when the switch is operated once. If it is needed to carry out further greasing, operate the switch again after completing the first greasing.

● During the greasing operation, the lamp at position (c) in the middle of the switch lights up.

2.Pull the lever of grease gun (1). When the lever is pulled, the pump is automatically actuated and grease is discharged. When the lever of grease gun (1) is released, the supply of grease stops.

Remark

● When using grease gun (1) to carry out greasing around the bucket, tighten stopper (2) of the pump discharge port and close the circuit to other lines.

● After completing greasing with the grease gun, always return the stop valve (2) to its original open condition.

Precautions When Using

● Set so that the nipple and the nozzle at the tip of the grease gun are perpendicular.

● When removing the nozzle at the tip of the grease gun from the nipple, angle the tip of the nozzle slightly and remove it carefully.

● When the amount of grease in the grease can goes down, the pump will run empty, so move the grease to the center or supply new grease.

Supplying Grease

1.Remove three wing bolts (2) from grease can (1), then remove cover (3) together with the pump.

2.Remove follow plate (4) inside the grease can.

3.Replace empty grease can (1) with a charged spare grease can, then set follow plate (4) on top of the grease.

● Fill the concave portion in the center of the follow plate with grease before putting the follow plate on top of the grease.

4.Insert the pump into the packing at the center of follow plate (4), set cover (3) on grease can (1), then tighten three wing bolts (2) uniformly to hold in position.

● The pump will move for a short time and then stop, but the air inside the pump will mix with the first grease and become cloudy white, so the condition is not good.

5.Loosen check valve (5) and discharge all the grease mixed with the air from hole (6) under check valve (5).

6.After bleeding the air, close check valve (5) securely.

7.After bleeding the air from inside the pump, pull the grease gun lever and discharge all the grease mixed with air from inside the hose and grease gun.

● When supplying grease, be extremely careful not to let any sand or dirt stick to the follow plate or suction portion of the pump.

● If the pump runs empty even when there is ample grease, the follow plate is probably not set properly, so check and set it properly.

● The standard size for the grease can is 18 liters. If a 20 liters can is used, the remaining amount of grease will increase.

REMARK

● Keep a spare grease can beside the grease pump.

● When not using the machine for a long period, pull the grease gun after stopping the engine to discharge the grease and release the pressure inside the grease can.