Manitowoc Grove GRT880, Operator'S Manual

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OPERATING CONTROLS AND PROCEDURES GRT880 OPERATOR MANUAL
3-76
Published 3-25-2020, Control # 643-04
Swinging Superstructure
To swing boom, activate Swing Enable Switch, push joystick
on left hand armrest to the right for right swing (rotates
turntable clockwise), or left for left swing (rotates turntable
counterclockwise). Always operate joystick with a slow, even
pressure.
NOTE: Swing brake activates automatically when joystick
is returned to the stop or neutral position to prevent
further rotation.
Elevating and Lowering Boom
Elevating Boom
To elevate boom, activate Lift Enable Switch, push controller
on right hand armrest to the left (raises boom), and hold until
boom reaches desired elevation.
Lowering Boom
To lower boom, activate Lift Enable Switch, push controller
on right hand armrest to the right (lowers boom). Hold until
boom lowers to desired position.
Telescoping Boom
NOTE: Telescope function is controlled by a foot pedal or
optionally by LH joystick controller. Telescope
modes are selected using the RCL.
Telescope Control Pedal
Activate telescope function with Telescope Enable Switch.
Push top of pedal to extend boom.
DANGER
Crushing Hazard!
Death or serious injury could result from being crushed by
moving machinery. Before activating swing, sound
steering wheel horn and verify all personnel are clear of
rotating and moving parts.
Keep area beneath boom clear of all obstructions and
personnel when lowering boom.
The operator must select proper load chart and RCL
program for outrigger position selected.
CAUTION
Never push or pull swing joystick through neutral to the
opposite direction to stop swing motion. Automatic swing
brake is activated by the joystick to stop swing rotation.
DANGER
Crushing Hazard!
Keep area above and below boom clear of all obstructions
and personnel when elevating the boom.
DANGER
Crushing and/or Tipping Hazard!
Keep area beneath boom clear of all obstructions and
personnel when lowering boom.
Long cantilever booms can create a tipping condition,
even when unloaded in an extended, lowered position.
CAUTION
Machine Damage!
When lowering boom, simultaneously let out hoist cable to
prevent two-blocking boom nose and hook block.
CAUTION
The closer the load is carried to the boom nose, the more
important it becomes to simultaneously let out hoist cable
as boom is lowered.
Mode Description
B
T2-3 remain retracted until T1 is fully
extended. Control system manages
telescoping sequence.
M
T1 and T2-3 have no defined extend or
retract order. Operator controls telescoping
sequence. Charted capacities strictly based
on boom length, not percentage extension.
No “out of sequence” possible.