Furukawa Unic URW370C4U Series, Operation & Maintenance Manual

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U-WAVE, Radio remote control device, (Option)
2. Resetting low temperature operation mode
8.
◆
Closing crane operation
Depress the “store hook” switch with the “swing C.C.W./C.W.” switch turned to “C.W.”.
Indication of “mode indicator lamp” changes to [
] and voice message “Ping-pong,
Change control mode, Change control mode” , is issued.
(Indication will not change if the “mode indicator” is showing [ ], [ ], or [ ].)
In addition, the low temperature operation mode is to be reset automatically, even when oper-
ation illustrated above has not been carried out, after approx. 10 minutes from the time when
it has been switched to the “low temperature operation mode”.
The voice message
“Ping-pong, Change control mode, Change control mode” , is issued at
this time.
Remarks
Response of the crane functions becomes slower when operated on low temperature operation
mode.
In normal case, operate the crane after warming-up for a while to raise temperature of hydraulic
oil.
Under extreme low temperature, crane operation may still be unstable even after the system has
been switched to the “low temperature operation mode”.
In this case take measures such as by carrying out warm-up operation to raise temperature of
hydraulic oil or by using hydraulic oil suitable for extreme low temperature.
If viscosity of hydraulic oil is too high at a low temperature, exces-
sive load will be imposed on hydraulic pumps which may cause dam-
age
to them.
In order to avoid this, be sure to carry out warming-up to raise tempera-
ture of hydraulic oil to an appropriate temperature to operate the crane.
CAUTION
After completion of the crane work, turn OFF
the starter switch to shut off power to the
crane after the boom, the hook, and the out-
riggers have been stored in their respective
positions.