Automatic Shift - Komatsu WA500-6H Operation & Maintenance Manual

3.3 Operation

Automatic shift

If an attempt is made to switch the direction between forward
and reverse when the auto-shift is ON, normally, the gearshift
range will switch F3 -> R2, F4 -> R2, or R3 -> F2, R4 -> F2 to
make it possible to move the machine off quickly.
Control for change of travel direction at high speed
If the travel direction is changed when the machine is traveling
at high speed, when the travel speed and engine speed are in
areas I or II in the chart, the central warning lamp lights up and
the alarm buzzer sounds. At the same time, " OVERRUN PRO-
TECT" is displayed on the character display.
If the alarm buzzer sounds, depress the brake immediately to
reduce speed sufficiently before changing the travel direction.
Changing the direction of travel at high speed will have an
adverse effect on the durability of the transmission.
If the direction of travel is changed in area II, the alarm buzzer
will sound, and at the same time the controller will automatically
control the speed range to ensure the durability. Note that com-
pared with area I, the deceleration of the machine is weaker.
Auto shift (shift position speed range: other than 1st) and
manual shift 2nd, 3rd, 4th
Gear speed before
changing between
FORWARD and REVERSE
F2
F3
F4
R2
R3
R4
Auto shift (shift position speed range: 1st) and manual shift
1st
Gear speed before
changing between
FORWARD and REVERSE
F1
R1
3-118
Gear speed after
changing between
FORWARD and REVERSE
R3 or R4
R3 or R4
R3 or R4
F3 or F4
F3 or F4
F3 or F4
Gear speed after
changing between
FORWARD and REVERSE
R2 or R3 or R4
F2 or F3 or F4
Operation
GK050132
GK050133
WA500-6H – VEAM430100