Komatsu Excavator PC240NLC-6K

Warning: This procedure requires trained personnel with PPE!

Direction of adjustment screw (3) turn

Enter the new pressure reading in MPa

Locknut tightened to 63.7 ± 9.8 Nm

Pressure checked after adjustment

Sign off on the oil pressure adjustment

If the load becomes larger, the engine speed will drop. Or if the engine speed remains normal, the work equipment speed will drop. In such cases, if the pump discharge pressure and LS differential pressure are normal, adjust the TVC valve as follows.

There are two sets, so adjust both the front and rear to the same angle.

1. Loosen locknut (3), and if the speed is slow, turn screw (4) to the left; if the engine speed drops, turn the screw to the right. If the screw is ·turned to the left, the pump absorption torque will be increased, and if it is turned to the right, the pump absorption torque will be reduced.

There is also a connection with the angle, so see Note below. The adjustment range for the screw is a maximum of 90° to both the left and right.

2. After completing the adjustment, tighten the locknut.

~ Locknut : 29.4 ± 4.9 Nm (3.0 ± 0.5 kgm)

Note: The screw is an eccentric cam, so if it is turned from position (a) in the graph, the stroke of the servo piston will move as shown in the graph. If it is turned one full turn, it will return to the original position, but the screw will become looser, so there will be play in the screw.

Therefore, turn the screw a maximum of 90° to the left and right from the position (a) set when the machine was shipped.;

Raise the track frame using the arm and boom, and measure the clearance between the bottom of the track frame and the top of the track shoe.

Is the clearance within the acceptable range (303 ± 20 mm)?

Sign off on the track shoe tension test

- Check item: Clearance between piston rod and bushing (Boom)

Standart Clearance: 0.084 – 0.347

- Check item: Clearance between piston rod and bushing (Arm)

Standart Clearance: 0.083 – 0.347

If the track shoe tension is not within the standard value, adjust as follows.

1. When the tension is too high:

Loosen plug (1) gradually, and release the grease. A There is danger that the plug may fly out under the high internal pressure of the grease, so never loosen plug (1) more than 1 turn. * If the grease does not come out easily, move the machine backwards or forwards slowly.

2. If track is too loose: Pump in grease through grease fitting (2). If the grease cannot be pumped in easily, move the machine backwards and forwards slowly.;