Komatsu WA480-8 Operation & Maintenance Manual page 267

OPERATION
HANDLE SECONDARY STEERING SYSTEM
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• Do not activate the secondary steering except in emer-
gency or checking the function.
• The secondary steering is continuously operable up to
60 seconds. Continuous operation beyond 60 seconds
may damage the system.
• When using the secondary steering, limit the travel
speed to 5 km/h or less.
• If the steering becomes heavy, keep the secondary
steering switch pressed, move the machine immedi-
ately to a safe place and stop it there.
Even when the engine is stopped for an emergency or for
checking the function, if the secondary steering pilot lamp
(green) (2) lights up when you press secondary steering switch
(1), steering (turning) operation becomes available.
Secondary steering pilot lamp (green) (2) lights up to inform the
operator that the secondary steering system has been actu-
ated.
The secondary steering system is designed to enable the turning (steering) operation under the following condi-
tions.
• The starting switch is at ON position.
• The steering oil pressure is low or there is no pressure.
(When the engine is stopped, or the steering pump is failed, etc.)
3 seconds after the starting switch is turned to ON position, the secondary steering automatically performs a self
check for 3 seconds. For detail, see "SELF-CHECK FUNCTION FOR SECONDARY STEERING (3-199)".
When the secondary steering controller detects lack of oil pres-
sure in the steering system, steering oil pressure caution lamp
(red) (3) and centralized caution lamp (4) lights up and the
alarm buzzer sounds intermittently.
When this happens, if the machine is traveling at 2 km/h or
above, the electric pump motor is automatically actuated and
secondary steering pilot lamp (green) (2) lights up.
Steering oil pressure caution lamp (red) (3) lights up to inform
the operator that there is a failure in the steering system.
If 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 repair is completed.
REMARK
When engine is running at low speed and when you use some hydraulic system functions, red steering pressure
caution lamp (3) may light up temporarily. There is no problem if the lamp is lit only instantaneously.
When the secondary steering controller detects recovery of the steering system oil pressure, actuation of the
secondary steering system is stopped.
SELF-CHECK FUNCTION FOR SECONDARY STEERING
The secondary steering is started automatically in approximately 3 seconds after the starting switch is turned to
ON position to check the secondary steering function.
CAUTION
MACHINE OPERATIONS AND CONTROLS
3-199