Komatsu WA500-6H Operation & Maintenance Manual page 130

3.2 Explanation of components
32. Torque converter lock-up switch
(Option)
WARNING
When traveling down slopes of a grade of more than 6°, never
depress the accelerator pedal fully, regardless of whether the
torque converter lock-up switch is ON or OFF. It is extremely
dangerous to drive too fast.
NOTE
To prevent overrun when the machine next travels at high
speed, do not shift down.
When traveling in F3 at a speed of 17 km/h (10.6 MPH) or more,
do not shift down to F2.
When traveling in F4 at a speed of 30 km/h (18.6 MPH) or more,
do not shift down to F3.
If the transmission is shifted down under the above conditions,
the overrun prevention function is actuated and the speed range
is maintained until the travel speed is reduced to the condition
for shifting gear.
When the actual travel speed range is 2nd - 4th in both forward
and reverse, the torque converter lock-up function is actuated
according to the travel speed and the transmission changes to
direct drive.
Use this switch (32) to operate the torque converter lock-up
function.
Position (a): ON
The pilot lamp inside the switch lights up and the lock-up is actu-
ated according to the travel speed. When the lock-up is in use,
the lock-up pilot lamp on the machine monitor lights up.
Position (b): OFF
Press this to cancel the lock-up.
REMARK
The torque converter lock-up function makes it possible to
improve the efficiency of power transmission when traveling at
high speed and also reduces the fuel consumption.
When traveling downhill and using the braking force of the
engine, actuate the torque converter lock-up.
3-64
Operation
GK050072
a
b
GK050073
WA500-6H – VEAM430100