JLG G6-42A Operator Manual - Manual (Page 33)

Form No. 20036 • G6-42A Owner/Operator Manual
12.2
Load Center
Loads shown on rated capacity chart are based on the load center being
610mm (two feet) above and 610mm (two feet) forward of surfaces of
horizontal forks.
The load center of a load is the center of gravity of the load. For regularly-
shaped loads of the same material, such as a pallet of blocks, the center of
gravity can be located by measuring the load to find its center. For irregular
loads, or loads of dissimilar materials, keep the heaviest part of the load as
close to the heel of the forks as possible.
In all cases, the load center must be centered between the forks.
Load Limits
Some capacities shown on the rated capacity chart are based on machine
stability and some are based on hydraulic lift capacity. The “common sense ”
or “feel” an experienced operator might apply in regard to “tipping loads”
DOES NOT APPLY to hydraulic load limits. Exceeding load limits can cause
damage, or, in some cases, cause the machine to tip over.
Items needed to Use a Capacity Chart
There are five items you must know and/or have in order to properly use a
Capacity Chart:
1. The weight of the load to be lifted
2. The angle of the boom
3. How much boom extension will be needed
4. The proper Capacity Chart
5. A Gradall-approved Attachment
Every Gradall attachment comes with its own Identification Plate. This Plate
has the Attachment Serial Number, Part Number, Attachment Capacity and
Attachment Weight stamped on it. Make sure that the Capacity Chart you
are using matches the attachment exactly. This may be done by matching
the attachment part number on the Capacity Chart to the part number
stamped on the Identification Plate. The Machine Serial Number Plate is
mounted inside the cab and lists all standard attachments that may be used
with the machine by part number, at the time it was shipped from the factory.
Be aware that a specific Capacity Chart must not only match the attachment,
but also the machine model.
The boom angle can be determined by looking at the angle indicator mounted
on the side of the boom. (See figure 12-4)
The boom extension can be determined by looking at the second boom section.
As the second boom section slides out of the main boom, numbers are
revealed starting with 1. Each number represents approximately 5 feet of
total boom extension. (See figure 12-4) It is important to remember that
these numbers are designed to be read from the operator’s seat only!
NOTE!
Some attachments may not be
approved for use with certain
machine models.