Manitowoc Grove GRT8120, Operator'S Manual

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Grove
Published 3-22-2021, Control # 702-02
2-5
GRT8120 OPERATOR MANUAL SAFETY INFORMATION
2
upon these electronic aids in place of good operating
practices can cause an accident.
Know the weight of all loads and always check the capacity
of the crane as shown on the
Load Chart before making
any lifts.
NEVER exceed the rated capacity shown on the Load Chart .
Always check the Load Chart to make sure that the load to
be lifted at the desired radius is within the rated capacity of
the crane.
For detailed information concerning the operation and
maintenance of the RCL system installed on the crane, see
the appropriate section later in this manual or the RCL
m a n u f a c t u r e r ’ s m a n u a l s u p p l i e d w i t h t h e c r a n e .
Manufacturers of rated capacity limiters may refer to them in
their manuals as a load moment indicator (LMI), a hydraulic
capacity alert system (HCAS), a safe load indicator (SLI), or
an EKS5; Grove refers to these systems as a rated capacity
limiter (RCL) throughout its
Operator and Service manuals .
Anti-Two-Blocking Device
This crane should have a functional Anti-Two-Block and
Control Lock-Out System. Test daily for proper operation.
Two-blocking occurs when the load block (hook block,
overhaul ball, rigging, etc.) comes into physical contact with
the boom (boom nose, sheaves, boom extension, etc.). Two-
blocking can cause hoist rope (wire rope or synthetic rope),
rigging, reeving, and other components to become highly
stressed and overloaded in which case the hoist rope may
fail allowing the load, block, etc. to fall.
Two-blocking is more likely to occur when both the main and
auxiliary hoist lines are reeved over the main boom nose and
b o o m e x t e n s i o n n o s e r e s p e c t i v e l y. A n o p e r a t o r,
concentrating on the specific line being used, may telescope
or lower the boom allowing the other hoist line attachment to
contact the boom or boom extension nose, thus causing
damage to the sheaves, or causing the hoist rope to fail,
dropping the lifting device to the ground and possibly injuring
personnel working below.
Caution must be used when lowering the boom, extending
the boom or hoisting up. Let out load line(s) simultaneously
to prevent two-blocking the boom tip(s) and the hook block,
etc. The closer the load is carried to the boom nose the more
important it becomes to simultaneously let out hoist rope as
the boom is lowered. Keep load handling devices a minimum
of 107 cm (42 in) below the boom nose at all times.
Two-blocking can be prevented. Operator awareness of the
hazards of two-blocking is the most important factor in
preventing this condition. An Anti-Two-Block System is
intended to assist the operator in preventing dangerous two-
block conditions. It is not a replacement for operator
awareness and competence.
Never interfere with the proper functioning of operational
aids or warning devices.
Working Area Limiter (If Equipped)
This crane may be equipped with a working area limiter as
part of the RCL system, designated as either Work Area
Definition System (WADS) or Working Range Limiter (WRL).
You must read and understand the operator manual before
operating the working area limiter system. Become familiar
with all proper operating procedures and with the
identification of symbol usage.
The working area limiter is intended to be used as an aid to
the operator. It is not a substitute for safe crane operating
practices, experience and good operator judgments.
9250 Example decal. For reference only.