Komatsu H70051 Series Operation & Maintenance Manual page 259

OPERATION
• When the machine is traveling, turn the steering wheel (1)
to the desired direction, then the machine turns to the di-
rection.
Front and rear frames of this machine is articulated around
the connection pin (center pin) at which the 2 frames are
connected with each other and the rear wheels follow the
trace of the front wheels.
• Turn the steering wheel lightly as it follows the turning of machine.
NOTICE
When steering the machine fully, if the steering wheel
is turned to its stroke end, do not try to turn it further.
Check that the play (a) of steering wheel is 60 mm or
less, and that the operation of steering wheel is nor-
mal. If any problem is found, ask your Komatsu dis-
tributor for inspection.
HANDLE SECONDARY STEERING SYSTEM
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• Do not actuate the secondary steering except in trou-
ble or checking the function.
• When using the secondary steering, limit the travel
speed to 5 km/h or less.
The secondary steering pilot lamp (green) (1) lights up to in-
form the operator that the secondary steering system has been
actuated.
The secondary steering system is designed to enable the turning (steering) operation under the following condi-
tions.
• Traveling while steering system is faulty
• Coasting while engine is stopped
REMARK
The secondary steering system does not operate while the machine is stopped.
The steering low oil pressure pilot pump (red) (2) lights up
when the steering pressure is low.
While the engine is stopped, the steering pressure is low and
the steering low pressure pilot lamp (red) (2) lights up, but this
does not indicate any abnormality.
If the secondary steering system detects lack of oil pressure in
the steering system while the engine is running, the steering
low oil pressure pilot pump (red) (2), the steering oil pressure
caution lamp (red) (3), and the centralized warning lamp (4)
light up, and the alarm buzzer sounds intermittently.
The steering oil pressure caution lamp (red) (3) lights up to in-
form the operator that there is a failure in the steering system.
CAUTION
MACHINE OPERATIONS AND CONTROLS
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