Komatsu 830E-AC Shop Manual page 766

DISABLED TRUCK DUMPING
PROCEDURE
Sometimes it is necessary to dump a load from the
body of a truck when 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 example below, Figure 8-23 illustrates a typical
hookup from the good truck. The disabled truck may
be another Model 830E, or a different Komatsu
model.
Hookup
Be certain there is an adequate, clear area to dump
the loaded box. When the good truck is in position,
shut down the engine and allow the hydraulic system
to bleed down. Be certain pressure has bled off
before connecting hoses.
1. With the good truck parked as close as possible
to the disabled truck, attach a hose from the
power up quick disconnect (3, Figure 8-23) to
the power down circuit of the disabled truck.
(Hose must be rated to withstand 17237 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 (4) to the power up circuit of
the disabled truck.
NOTE: If both trucks are a Model 830E, the hoses
will be installed at the quick disconnects shown in
Figure 8-23 and will be crossed when connected.
L8-24
Dumping Procedure
Raising the Body:
3. 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).
FIGURE 8-26. PUMP MODULE, HOSE HOOKUP
1. Hoist Valve
2. Overcenter Manifold
3. Power Up Quick Disconnect; Connect to
4. Power Down Quick Disconnect; Connect to
Hoist Circuit Component Repair
(Model 830E Shown)
power down circuit of "disabled" truck
power up circuit of "disabled" truck
L08038