Grove Published 02-21-2019, Control # 611-05 2-21
TMS9000-2 OPERATOR MANUAL SAFETY INFORMATION
Counterweight
On cranes equipped with removable counterweights, ensure
the appropriate counterweight sections are properly installed
for the lift being considered.
Do not add material to the counterweight to increase
capacity. United States Federal law prohibits modification or
additions which affect the capacity or safe operation of the
equipment without the manufacturer’s written approval.
[29CFR 1926.1434]
Outrigger Lift Off
Regarding “lifting” of an outrigger pad during craning
activities, be advised that the rated loads for these cranes,
as indicated on the crane’s Load Chart, do not exceed 85%
of the tipping load on outriggers as determined by SAE J765
“Cranes Stability Test Code.” An outrigger pad may lift off the
ground during operation of the crane within the capacity
limits of the Load Chart, yet the crane will not have reached
instability. The “balance point” for stability testing according
to SAE and Grove criteria is a condition of loading wherein
the load moment acting to overturn the crane is equal to the
maximum moment of the crane available to resist
overturning. This balance point or point of instability for a
crane does not depend on “lifting” of an outrigger but rather
on comparison of the “opposing” load moments.
The occurrence of an outrigger lifting from the ground is often
attributed to the natural flex in the crane’s frame. This may
happen when lifting a load in certain configurations within the
capacity limits of the Load Chart and is not necessarily an
indication of an unstable condition.
Provided the crane is properly set up, the crane is in good
working condition, that all operator’s aids are properly
programmed, that the qualified crane operator adheres to
the instructions found in the applicable Load Chart, Operator
Manual and decals on the crane, the crane should not be
unstable.
Multiple Crane Lifts
Multiple crane lifts are not recommended.
Any lift that requires more than one crane must be precisely
planned and coordinated by a qualified person. If it is
necessary to perform a multi-crane lift, the operator shall be
responsible for assuring that the following minimum safety
precautions are taken:
• Secure the services of a qualified person to direct the
operation.
• Make sure all signals are coordinated through the lift
director or person in charge of the lift.
• Coordinate lifting plans with the operators, designated
person, and signal person prior to beginning the lift.
• Maintain communication between all parties throughout
the entire operation. If possible, provide approved radio
equipment for voice communication between all parties
engaged in the lift.
• Use outriggers on cranes so equipped.
• Calculate the amount of weight to be lifted by each crane
and attach slings at the correct points for proper weight
distribution.
• Ensure the load lines are directly over the attach points
to avoid side loading and transfer of loading from one
crane to the other.
• Do not travel. Lift only from a stationary position.
Lifting Multiple Loads
Grove recommends lifting only one load at a time.
Lifting two or more separately rigged loads at one time is only
permitted during steel erection in accordance with
29CFR1926.753 when the following criteria are met:
1926.753(e)(1) A multiple lift shall only be performed if the
following criteria are met:
• 1926.753(e)(1)(i) A multiple lift rigging assembly is used;
• 1926.753(e)(1)(ii) A maximum of five members are
hoisted per lift;
• 1926.753(e)(1)(iii) Only beams and similar structural
members are lifted; and
• 1926.753(e)(1)(iv) All employees engaged in the
multiple lift have been trained in these procedures in
accordance with § 1926.761(c)(1).
• 1926.753(e)(1)(v) No crane is permitted to be used for a
multiple lift where such use is contrary to the
manufacturer's specifications and limitations.
1926.753(e)(2) Components of the multiple lift rigging
assembly shall be specifically designed and assembled with
a maximum capacity for total assembly and for each
individual attachment point. This capacity, certified by the
manufacturer or a qualified rigger, shall be based on the
manufacturer's specifications with a 5 to 1 safety factor for all
components.
1926.753(e)(3) The total load shall not exceed:
• 1926.753(e)(3)(i) The rated capacity of the hoisting
equipment specified in the hoisting equipment load
charts;
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