How to Disable Truck Dumping for Komatsu 930E Dump Truck

This instruction show you guide on how to disable truck dumping for Komatsu 930E dump truck.All content for Komatsu trucks,please refer to Komatsu CSS Full Set 2018 2014 Parts Viwer Free Download


Sometimes it is necessary to dump a load from the body of a truck if the hoist system is inoperable. The following instructions describe the use of a “good” truck to provide the hydraulic power required to raise the body of the “disabled” truck to dump the load.

In the following example, Figure 30-1 illustrates a typical hookup from the good truck. The disabled truck may be the same truck model or a different Komatsu truck model.

Make sure that there is an adequate, clear area to dump the loaded body. When the good truck is in position, turn off the engine and allow the hydraulic system to bleed down. Make sure that the pressure has bled off before connecting the hoses.

1.With the good truck parked as close as possible to the disabled truck, attach a hose from the power up quick disconnect to the power down circuit of the disabled truck.

The hose must be rated to withstand 17,000 kPa (2500 psi) or greater pressure.
NOTE:The power down circuit will use a smaller diameter hose (tube) than the power up circuit.

2.Connect another hose from the power down quick disconnect (3) to the power up circuit of the disabled truck.
NOTE:If both trucks are the same model, the hoses will be installed at the quick disconnects and will be crossed when connected


Raising the Body
1.On the disabled truck, move the hoist control lever to power up and then release it to place the hoist pilot valve in the HOLD position (leave in this position during entire procedure).

2.Start the engine on the good truck, place the hoist control in the POWER DOWN position and increase the engine rpm to high idle to dump the disabled truck. If the body of the disabled truck fails to raise, increase the good truck power down relief pressure as follows:
a.Shut down engine and allow the hydraulic system to bleed down.
b.Remove the cap from the hoist pilot valve relief valve (2), located in the hydraulics components cabinet behind the cab. While counting the number of turns, slowly turn the relief valve adjustment screw clockwise until it bottoms. Repeat Step 2.



Lowering the Body
1.Place the hoist lever of the good truck in FLOAT to lower the body. If necessary, momentarily place the hoist control in POWER UP until the body is able to descend in FLOAT. Do not accelerate the engine.
2.After the body is lowered, shut down the engine, bleed the hydraulic system,and disconnect the hoses.
3.Reduce the power down relief valve pressure on the good truck to normal by turning the adjustment counterclockwise the same number of turns as required in Step 2b of “Raising the Body.”
4.Check the power down relief pressure. Refer to Section L, Hydraulic Check-Out Procedure, in the shop manual.
5.Check the hydraulic tank oil level.


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