Changing Gear Speed - Komatsu WA500-6H Operation & Maintenance Manual

3.3 Operation

Changing gear speed

WARNING
When traveling at high speed, do not shift gear suddenly.
Use the brake to reduce the travel speed before shifting
gear.
Do not switch between FORWARD and REVERSE when
traveling at high speed.
When switching between FORWARD and REVERSE,
depress the brake to reduce the travel speed sufficiently,
then change the direction of travel. (Max.speed for changing
direction: 12 km/h)
Shift gear as follows.
When shifting gear, use the auto shift/manual shift selector
switch (1) to select the mode and gear shift lever (2) to set the
speed range.
Position (a): 1st
Position (b): 2nd
Position (c): 3rd
Position (d): 4th
For details, see "Preparations for moving the machine (3-113)".
When carrying out digging and loading operations, 1st and 2nd
are used, so use the gearshift lever stopper (2).
REMARK
This machine is equipped with a kickdown switch (3) that shifts
the gear down to 1st if the button at the tip of the lift arm control
lever is pushed when the machine is traveling in 2nd gear. We
recommend the use of the kickdown switch when carrying out
digging or loading operations in 1st or 2nd gear.
For details of use, see "Kickdown switch (3-56)".
This machine is equipped with an auto-shift system that
automatically shifts the gear. For details of the method of
use, see ""Transmission auto shift/manual shift selector
switch (3-58)"" and ""Automatic shift (3-68)"".
When traveling at high speed with the accelerator pedal
depressed, even if the transmission is shifted down from 4th
-> 3rd or 4th -> 2nd, to protect the engine from overrunning,
the transmission does not shift down. In this case, the cen-
tral warning lamp lights up and the alarm buzzer sounds. At
the same time, "OVERRUN PROTECT" is displayed on the
character display.
If the alarm buzzer sounds, let the accelerator pedal back
immediately, depress the brake pedal to reduce the travel
speed, then shift gear.
3-116
2
a
b
c
d
3
WA500-6H – VEAM430100
Operation
3
1
GK050125
2
GK043142
GK050129