Gradall 544D (9136-4003) Service Manual - Manual (Page 32)

12.2
NOTE!
Some attachments may not be
approved for use with certain
machine models.
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!
How to read a Capacity Chart
When reading the capacity chart you must check to be sure the correct model
number is listed. (See figure 12-5) The next thing to look for is that the part
number of your attachment is listed under the “Use With” section.
Identify and find the amount of boom extension required, along with the angle
of the boom. Trace the boom extension arc down until it intersects with the
appropriate boom angle. If the intersection of the boom extension arc and the
boom angle line occur within a weight region, the value within that region is
the maximum capacity for that particular lift. If the intersection occurs on a
bold line separating capacity regions, the smaller of the two values must be
used. The regions are clearly marked with heavier outlines as shown on page
12.3. If you do not have the correct capacity chart for your machine and/or
attachment, contact your Distributor or Gradall to order one.
Example:
A contractor has purchased a 544D-10 with the 48” Slope Piler Carriage
Attachment. (See figure 12-5) He knows his attachment may be used with
this model since the attachment part number, 9108-5058, matches the
attachment part number stamped on the machine Serial Number Plate. He
also knows that the Capacity Chart is correct since it is clearly marked for use
with a 544D-10 and that the attachment he is using is listed at the top by part
number. He has determined the weight of the load to be lifted is 4000 lbs. and
that he needs to place the load at a boom extension of 6 at a boom angle of
20°. By tracing the boom extension arc down to where the 20° line intersects
it, the contractor can see that the maximum weight he can lift, with stabilizers
down, is 5000 lbs. In this case, he may lift the load.