Komatsu GALEO HM350-2 Operation & Maintenance Manual page 155

OPERATION OPERATION
4. When dump lever (3) is moved to the LOWER position, the
dump body will start to move down.
5. When the dump body has moved down a certain distance,
move dump lever (3) to the FLOAT position. (When the lever is
released, it will return to the FLOAT position.) The dump body
will then move down under its own weight.
When raising the dump body, let the accelerator pedal back
near the maximum angle to avoid any impact load on the
hydraulic circuit or hoist cylinders.
When the dump body is raised, if the shift lever is at the D
position, the transmission is fixed in 2nd, and if it is at positions
1 - 5, the transmission is fixed in 1st. Keep the dump body
lowered when traveling.
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OPERATION OPERATION