Crane operation
11.1 Before operating the crane
Operating Manual GMK6300L 3 112 xxx en 11 - 13
xx.xx.xxxx
11.1.6 Preheating the hydraulic oil
H
It may take some time for the solenoid valves to be switched or the power
units may be started abruptly if the oil is cold.
The current hydraulic oil temperature is displayed in the
Monitoring sub-
menu. To open the submenu;
à p. 10 - 15.
– Above 10 °C (50 °F)
Crane operation with load is permissible without speed restriction.
– From 0 °C to 10 °C (50 °F to 32 °F)
• To preheat, carry out crane movements with loads only in normal oper-
ation mode, at average engine speed and at average operating speed.
– From 0 °C to -15 °C (32 °F to 5 °F)
• To preheat, only carry out crane movements without a load. Only
operate at normal speed, at medium engine speed and medium
working speed.
– Below -15 °C (5 °F)
Crane movements are not permitted. Preheat the hydraulic oil first.
(A) – Preheating
• Open the valve – lever (1) parallel to the line.
• Press the button (2) and retract the lifting
cylinders to the full extent at low engine
speed;
à p. 12 - 76.
The hydraulic oil has been preheated when
display (3) shows a temperature of at least
10 °C (50 °F).
(B) – Before crane operation
Do not touch the hot exhaust system (4).
• Close the valve – lever (1) at right angles to
the line.
H
Operate all crane functions at least twice after preheating (hydraulic oil tem-
perature above 10 °C (50 °F)) in order to remove the cold oil from all parts
of the hydraulic system.
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