Manitowoc Grove GRT880

Grove Published 3-25-2020, Control # 643-04 3-77
GRT880 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
3
Extending Boom
Retracting Boom
Activate telescope function with Telescope Enable Switch,
then push on bottom of pedal to retract boom.
Lower and Raise Hoist Cable
NOTE: When load is stopped at desired height, the
automatic brake will engage and hold the load as
long as controller remains in neutral.
Lower Cable
Turn on Hoist Enable Switch. Push main hoist (right hand
armrest) or auxiliary hoist (left hand armrest) controller
forward, away from operator. Hold until hook or load is
lowered to desired height.
Raise Cable
Turn on Hoist Enable Switch. Pull main hoist (right hand
armrest) or auxiliary hoist (left hand armrest) controller
toward operator. Hold until hook or load is raised to desired
height.
Hoist Speed Range Selection
1. Hold hoist enable switch for 1.5 seconds.
2. Double-click hoist enable switch.
3. On a dual axis joystick, push and release the outside
(farthest from operator) of the respective Hoist Speed
Toggle Switch to enable high speed (maintained state).
push the switch again to disable the high speed.
4. On a dual axis joystick, push and hold the inside (closest
to operator) of the respective Hoist Speed Toggle Switch
to temporarily enable high speed (momentary state) and
release the switch to disable the high speed.
DANGER
Crushing Hazard!
Check Load Chart for maximum load at a given radius,
boom angle, and length before extending boom with a
load.
CAUTION
Before extending boom, ensure large access cover on top
of boom base section is installed.
When extending boom, simultaneously let out hoist cable
to prevent two-blocking boom nose and hookblock.
DANGER
Crushing Hazard!
When retracting the boom, the load will lower unless the
hoist cable is taken in at the same time
DANGER
Crushing Hazard!
Keep area beneath load clear of all obstructions and
personnel when lowering or raising cable (load).
DANGER
Crushing Hazard!
Do not jerk joystick when starting or stopping hoist.
Jerking lever causes load to bounce, which could result in
possible damage to the crane.
CAUTION
Do not change speeds while hoist is active. Always select
hoist speed before actuating the hoist up or down
function.