OPERATING PROCEDURES
Revised: October 20053 - 7RT700
3. Use the load rating chart attached to the crane to in-
terpret the conditions and limitations that exist
when making a lift with the crane. The determining
factors are lifted load, radius, boom angle, working
position, hoist line reeving, tire pressure, travel da-
ta, and use of a jib.
The examples given in this section pages 3-23 thru 3-
29 are given for your interpretation of the terminology
used on the chart. CAUTION: The load rating chart val-
ues used in the examples may not be the same as
those on your load rating chart. Use the numbers from
the chart attached to your crane whenever making lift
calculation
Always consider, anticipate, and/or determine by trial
the maximum amount of wire rope which will be payed
off the winch drum to perform each different craning
application of this crane. Be sure to provide for no less
than two full wraps of wire rope remaining on the winch
drum as specified in all applicable crane operating
safety standards.
The increased possibility for inadequate wraps remain-
ing on the winch drum occurs when operating with a
higher number of parts of line than are required for the
load being lifted, particularly at longer boom lengths
and high boom angles.
Sufficient wire rope is initially provided to allow the
hook block to reach ground level when reeved for the
required parts of line indicated on the capacity chart for
all given loads. Reeving with more parts of line than re-
quired may result in all of the wire rope being payed off
the winch drum.
The intent of this caution is to prevent any possibility
of either reverse winding of the rope on the winch
drum, which could cause breakage of the winch rope,
or of unseating the rope wedge in the winch drum,
which could result in the uncontrolled fall of the hook
block and load.
4. Raise the boom to the required angle, consulting the
boom angle indicator which indicates boom angle rela-
tive to upperstructure.
The boom elevation is controlled by the right joystick.
To RAISE the boom, slowly move the joystick LEFT.
To LOWER the boom, slowly move the joystick
RIGHT. Improved control is obtained by operating the
engine at low speed while “metering” the controls. Al-
ways operate and release the controls slowly to mini-
mize dynamic effects of the load. During a lift where
precise control of the load is required, do not attempt
to use more than one function at a time.
Always consider possible obstructions when varying
boom height or length; not only those to the front of the
cab at the time of the adjustment, but those which may
be encountered during swings.
Think the swing through, considering all obstacles, be-
fore making the swing.
Never hold the controls in an “activated” position once
the hoist/lower cylinder or extend/retract cylinders
have reached the limits of their travel. This can cause
overheating of the hydraulic oil if it is run over relief for
prolonged periods.
5. Swing the boom over the load.
Upperstructure swing is controlled by the left joystick.
To swing the upperstructure to the RIGHT, move the
joystick RIGHT. To swing LEFT, move the joystick
LEFT. Swing speed increases as the lever is moved
further left or right. Swing speed also varies with the
engine speed.
To Next Page
Loading...
Need help?
General
