Chapter 2 Specifications 15
Stability Confirmation Process
To confirm stability:
1 Set up unit on a hard, flat surface which meets SAE J765 requirements. Use all
recommended equipment such as stabilizers, etc.
2 Position the crane at full, horizontal reach. For a 5525 crane, use a 2,172 ± 10 lb test weight
suspended over the rear of the truck. For a 6025 crane, use a 2443 ± 10 lb test weight
suspended over the rear of the truck. Rotate the test weight up to the point where the pointer
on the crane base meets the yellow bands on both sides of the unit. If the unit keeps at least
one rear tire firmly touching the ground, the test can be continued for the capacity on the
sides. If the criterion is not met for the rear of the unit, a custom RCLC is required. Please
contact IMT for assistance in this situation.
NOTE
THE TIRE IS TOUCHING THE GROUND WHEN AT LEAST 90% OR MORE OF THE TREAD
SURFACE IS CONTACTING THE GROUND.
Once stability is verified over the rear section of the truck, test the stability on the sides of the
truck. Again, using the test weight in a fully extended, horizontal position, rotate the crane
around the sides of the truck. If the test weight passes the sides with at least one rear tire
firmly touching the ground, a standard Hydraulic Capacity Chart may be used rather than a
Reduced Capacity Lift Chart.
CAUTION
THE UNIT MAY TILT SEVERELY!
If the unit does not pass the side load test, you must begin retracting the booms to find the
usable percentage of the crane capacity.
For a 5525 crane, retract the booms 42” for a capacity derating to 80%. For a 6025 crane,
retract the booms 63” for a capacity derating to 70%. Measure from a fixed point on the
boom tip horizontally to a fixed point on the main boom to verify how far the booms have
been retracted. See table.
CRANE MODEL
TEST WEIGHT PERCENT RATED
LOAD (%)
DISTANCE BOOMS ARE
RETRACTED FROM FULL
EXTENSION (INCHES)
5525 2,172 ± 10 lb 80% 42"
6025 2,443 ± 10 lb 70% 63"
Once the booms are retracted, re-check stability by again rotating the crane around the sides
of the truck, making sure the weight passes by the yellow region marked on the crane base
with at least one rear tire firmly touching the ground.
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