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12. OPERATION
12.6 TRAVELING DOWNHILL
When traveling downhill, travel at a safe speed which matches
the width of the road, the condition of the road surface, and other
conditions of the jobsite.
WARNING
‡ If the machine is stopped, put blocks under the wheel imme-
diately.
‡ For the maximum permissible speed when traveling downhill
using the retarder, see the brake performance graph for the
downhill distance and grade.
Traveling continuously downhill at a speed greater than the
maximum permitted speed on the brake performance graph
is dangerous as the retarder brake may be damaged.
‡ If the retarder oil temperature monitor on the machine moni-
tor flashes when using the retarder, shift down to travel
downhill.
(When this happens, the central warning lamp flashes and the
alarm buzzer sounds.)
If the monitor lamp does not go out even when the transmis-
sion is shifted down, stop the machine immediately, set the
shift lever to the N position, run the engine at the 2000 rpm,
and wait for the monitor to go out.
‡ If the retarder loses its effect when it is used for traveling
downhill, do as follows.
1. Release the retarder brake completely, then operate the
retarder lever again.
2. If the retarder still has no effect even when the retarder
lever is operated again, return the retarder lever com-
pletely to the released position, then depress the brake
pedal to stop the machine, and contact your Komatsu
distributor for repairs.
‡ Operate the retarder slowly. If the brakes are applied sud-
denly, there is danger that the tire will slip.
NOTICE
‡ If the retarder lever is operated when traveling downhill, the
transmission can be shifted down sooner than with normal
deceleration. It is also possible to travel without shifting up.
‡ When traveling downhill, do not use the foot brake except in an
emergency. Using the foot brake will cause overheating of the
front brake and reduce the life.
‡ Do not accelerate or shift up when using the retarder. The
engine speed will rise and this may cause the alarm buzzer to
sound and the central warning lamp to flash.
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