Komatsu HM400-1, Manual

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OPERATION
OPERATION
SHIFTING GEAR
When shifting gear, do as follows.
This machine has an automatic transmission, so set shift lever (1)
to the desired position, and the transmission will automatically shift
to a position to match the travel speed.
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.
NOTICE
When shifting between FORWARD and REVERSE, stop the machine
completely, and run the engine at low idling when shifting the lever.
After moving the shift lever, do not depress the accelerator until you
detect that the transmission clutch has engaged.
Do not operate the shift lever with the accelerator pedal depressed. This
will cause a big shock, and will also reduce the service life of the
machine.
SHIFTING UP
1. When accelerator pedal (2) is depressed to accelerate the
machine, the lockup clutch is engaged to shift the transmission
to direct drive.
2. If the machine is accelerated further, the transmission will
automatically shift up.
SHIFTING DOWN
If accelerator pedal (2) is released, the machine speed will be
reduced, and the transmission will automatically shift down.
DOWN SHIFT INHIBIT
If the shift lever is operated when the machine is traveling, and the travel speed is faster than the maximum speed
for each gear position, the transmission is not shifted immediately but is shifted down when the travel speed drops.
This prevents overrunning of the engine.
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