OPERATING CONTROLS AND PROCEDURES 5540F/YB5515 OPERATOR’S MANUAL
3-24 Published 10-21-2011, Control # 055-03
Anti-Double Blocking System
This system inhibits the hook block from being pulled into the
boom head during extension of the booms, raising of the
booms and during hoist operation. If the hook block touches
the anti-double block bracket (Figure 3-50) under the boom
head, a switch is actuated. This switch stops hydraulic oil
flow to telescope out, boom lift and hoist motor raise
functions. A horn is activated to give a warning to the
operator in all cases. Before operation can resume, the hoist
block must be first lowered away from the boom head
NOTE: DO NOT disconnect the anti-double block system.
Possible damage to the boom, hoist or crane could
result.
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 3-51) 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 3-51) until the desired swing speed is obtained.
The further the control is pushed forward the faster the mast
will rotate.
NOTE: 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.
p1622
Anti-Double Block Bracket
FIGURE 3-50
To Next Page
Loading...
Need help?
General
