Method For Operating Work Equipment - Komatsu H75051 Operation & Maintenance Manual

OPERATION
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.
If the steering oil pressure caution lamp (red) (3) lights up, move the machine immediately to a safe place and
stop it there.
Do not operate the machine until the cause is identified and it is repaired.
REMARK
When engine is running at low speed and when you use some hydraulic system functions, the steering low oil
pressure pilot pump (red) (2) may light up temporarily. There is no problem if the lamp is lit only momentarily.
When the secondary steering system detects the recovery of the oil pressure in the steering system, the secon-
dary steering system stops its actuation.

METHOD FOR OPERATING WORK EQUIPMENT

Never perform the boom RAISE operation with the machine articulated and the bucket full. There is a
danger that the machine may tip over.
NOTICE
Even if the engine is stopped, if the starting switch is at ON position and lock of the work equipment is
canceled (pilot lamp is not lit), the work equipment can move.
CAUTION
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MACHINE OPERATIONS AND CONTROLS
WARNING
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