Komatsu WA800-3E0, Operation & Maintenance Manual

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OPERATION
OPERATION
3-93
CONTROL WHEN SHIFTING DOWN AT HIGH SPEED 3
Shifting down at high speed has an adverse effect on the durability of the torque converter.
Based on the table below, when shifting down at high speed, the alarm buzzer sounds for 3 seconds (repeated
short beeps). At the same time, the controller automatically controls the shift down operation to ensure durability,
but note that the deceleration of the machine becomes weaker.
Control when shifting down (manual shift)
Control when shifting down (auto-shift)
Operation of
shift-down
switch
3rd
3rd
o
2nd
3rd
o
1st
2nd
o
1st
Kick-down
from F2nd
Command from controller
3rd
2nd
3rd &
caution
3rd &
caution
2nd & caution
2nd & caution
1st
1st
Shifted to 1st
Kept at 2nd
Travel speed
Above 20 (km/h)
Engine
speed
Engine
speed
Command from controller
Operation of
shift-down
switch
3rd
3rd
3rd
o
2nd
3rd
o
1st
2nd
o
1s
Kick-down
control
Shifted to 1st
Kept at speed range
2nd & caution
1st
2nd & caution
2nd
1st
3rd &
3rd &
caution
caution
Travel speed
Above 20 (km/h)
used before kick-down
(2nd or 3rd)