RT100 Rough Terrain Crane
07 - 27
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
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
F. The boom angle indicator and the angle detector attach to the side of the main
boom. Refer to Figure 07 – 24. The operator can see the angle indicator from the
cab of the crane. The angle detector is an electronic device that sends the boom
angle data to the RCI (Rated Capacity Indicator). The boom angle shows on the
display screen.
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