Grove Published 07-06-2017, Control # 406-03 3-21
CD5520/YB5520 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
Operating the Boom Controls
Four levers in the operator’s cab control the boom functions.
See Figure 3-1. These levers are connected to the main
control valves by hydraulic pilot lines. The function of each
control is shown in Figure 3-31.
When operating each control, press the accelerator pedal to
increase engine speed to maximum rpm. Slowly move the
control lever. The further the control lever is moved the faster
the function will operate. To stop function movement, move
the control lever to the neutral position, then lower the engine
speed to idle.
NOTE: The function speeds can also be controlled by
engine rpm. The slower the rpm the slower the
function speed.
Boom Swing Operation
Before rotating the mast, be sure there is enough clearance
on all sides and that all persons are away from the area. A
pinch point between the operator’s cab and mast can cause
injury or death.
To Rotate the Mast to the Left (Counterclockwise)
Press the accelerator pedal to increase the engine speed to
maximum rpm. Slowly pull back on the swing control lever
(Figure 3-32) until the desired swing speed is obtained. The
further the control is pulled back the faster the mast will
rotate.
To Stop Rotation
Slowly move the control lever to the neutral position and
decrease the engine speed to idle.
To Rotate the Mast Right (Clockwise)
Press the accelerator pedal to increase the engine speed to
maximum rpm. Slowly push forward on the swing control
lever (Figure 3-32) until the desired swing speed is obtained.
The further the control is pushed forward the faster the mast
will rotate.
CAUTION
Never put side loads on the boom. Side loads can
damage the swing gearbox. Move the boom so that it is
directly above the load before lifting the load.
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