Zoomlion RT75, Руководство оператора

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RT75 Rough Terrain Crane
07 - 31
7.15 BOOM DERRICK OPERATION
A. To move the boom up or down (derricking), hydraulic oil is pumped in or vented out of
the derricking cylinder.
B. The boom angle (boom derricking) is adjusted from -3°
–
78°, by telescoping the
derricking cylinder. When the boom is in the front at a -3°angle, jib assembly, line
parts and boom head parts maintenance can be carried out easily.
C. The derricking cylinder has a balance valve. The balance valve, in the hydraulic
system, helps the telescoping components move smoothly. When the boom is set at
the correct length, the valve stops the hydraulic oil flow out of the derricking cylinder.
This helps to lock the boom in position.
D. The right joystick controls the derricking movements. The seat must be occupied
to use this function.
E. The speed of the derricking up / down movements change by:

Joystick - how far you move the joystick left or right

Throttle pedal - increase or decrease the engine RPMs.
Figure 07
–
23 Derricking Operation