Crane operation
10.1 Before operating the crane
10 - 14 3 302 633 en Operating Instructions GMK5250L
27.09.2017
10.1.6 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 start menu.
For crane operation with loads and without speed limitation, the hydraulic
oil temperature must be at 10 °C (50 °F).
If the temperatures fall below 10 °C (50 °F), proceed as follows:
– From 10 °C to 0 °C (50 °F to 32 °F)
You can carry out crane movements with loads only at normal speed,
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)
You must preheat the hydraulic oil before carrying out crane movements.
Prerequisites – The engine for crane operation is running,
– The seat contact switch or a dead man's switch is actuated,
– The hydraulic oil temperature is no greater than 30 °C (86 °F)
Preheating
• Select and confirm the symbol (1) – symbol is red.
The engine speed is increased, the hydraulic fluid is preheated until
reaching a temperature of 30 °C (86 °F).
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