National Crane 01-22-2019 Control # 051-08 9-21
1300A CRANE INSTALLATION
RCL CALIBRATION
After the crane has been installed and all electrical and
hydraulic connections are completed, calibrate the RCL.
Calibrate the RCL as described in the RCL manual titled
Calibration/Service Manual.
STABILITY TEST
The purpose of the stability test is to verify that the rated load
can be lifted with an 85% tipping factor. With an 85% tipping
factor, the crane can lift a rated load and be at 85% of the
tipping condition or less.
A stability test must be performed on each completed unit to
determine the 85% tipping factor. Proceed as follows:
1. Put the test unit on a firm level surface. Place cribbing
under the outrigger floats.
2. With the boom in the rest, raise and level the machine on
the outriggers with all tires clear of the ground. See the
Operator Manual. Set the single front outrigger (SFO) (if
equipped).
3. Loads listed in the Load Chart that are not in the shaded
area are limited by stability. To determine if the machine
is stable with an 85% tipping factor, it is necessary to lift
stability test loads at 1.18 times the rated load.
NOTE: The stability test is done with no jib stowed on the
side of the boom. Remove the jib from the boom
before the start of the stability test.
The weights listed in the Stability Test Table below verify
that all rated loads on the load chart can be safely lifted.
EXAMPLE 1: 1369 A
Test Load Start Position Over the Back
• Boom Length: 30.6 ft (9.3 m)
• Rated Radius: 25 ft (7.6 m)
• Rated Load 16550 lbs (7506.9 kg)
• Stability Test Load (no jib stowed):
16550 x 1.18 = 19529 Ibs (8858.2 kg)
EXAMPLE 2: 13100 A
Test Load Start Position Over the Back
• Boom Length: 44 ft (13.4 m)
• Rated Radius: 30 ft (9.1 m)
• Rated Load 12,300 lbs (5579.1) kg
• Stability Test Load (no jib stowed):
12,300 x 1.18 = 14,514 Ib (6583.4 kg)*
EXAMPLE 3: 13110A
Test Load Start Position Over the Back
• Boom Length: 46 ft (14 m)
• Rated Radius: 35 ft (10.6 m)
• Rated Load 9600 lbs (4354.4) kg
• Stability Test Load (no jib stowed):
9600 x 1.18 = 11328 Ib (5183.2.4 kg)*
*Includes weights of slings and hook block.
NOTE: Be sure the weights lifted are accurate. A 1%
increase in load weight can result in a 10%
increase in the required counterweight.
4. Do the following for each test position listed in the
Stability Test Table.
a. Assemble the first test load as listed for the test
position in the stability test table. Place the test load
next to the crane.
b. Measure the rated radius from the center line of
rotation out from the crane as specified for the test
position. Mark the position.
c. Extend the boom to the boom length specified for
the test position.
d. Lift the load slightly off the ground. (about 6 inches).
e. Slowly boom down and hoist up until the test load
reaches the rated radius position. Do not exceed or
allow the load to swing out past the rated radius.
f. Slowly rotate the load throughout the work area.
If the test load can be kept from contacting the ground at
the stability radius, the unit is stable over the rear.
5. If unit is unstable rotating, counterweight needs to be
added.
Repeat step 4 for all test loads in the Stability Test Table for
the model boom that is on the crane.
DANGER
Loads used for stability tests put the crane at the tipping
point. Keep the load close to the ground. Control of boom
position is critical. Do not swing test loads out past the
rated radius. If the crane starts to tip and the boom angle
is too low the crane will overturn.
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