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Oshkosh Corporation Classification: Unrestricted

Stability Test 57

3 Slowly start rotating the load counterclockwise. Through each area on Figure 1 (30°

increments), check for stability. If the crane carries the load through the entire area without

becoming unstable, the crane is stable in that area, and 100% can be noted in the area in

Figure 1.

NOTE

The tires can lift from the ground without the

truck becoming unstable. The truck is

unstable w hen it reaches the balance point.

4 If at any point through the rotation cycle the vehicle becomes unstable, stop the rotation.

Determine the area, as shown in Figure 1, in which the crane is positioned.

5 Retract the extension boom until stability is regained. Measure the horizontal reach when

the unit is stable, from the center of rotation to the boom tip. Note this reach in Figure 1, in

the area which became unstable in step #4.

6 Continue rotating the boom after stability has been regained. Again, watch for instability as

defined by the balance point. If a point of instability reoccurs, retract the extension boom until

stability is regained. Again, measure the stable horizontal reach at this point, and note this

distance in the appropriate area in Figure 1.

7 Repeat this cycle through a full 180° of arc. Fill in all of the reach boxes for Areas 1 through

5 in Figure 1.

Repeat for Areas 6 through 10.

8 If the crane was stable in all areas, fill in 100% in all of the percentage boxes in Figure 1.

9 If the stable horizontal reach in any area was less than the maximum horizontal reach (L,

noted in step 2), calculate the percent of full capacity allowed in the area as follows:

10 Enter the derated percent of full capacity, calculated in step 8, on Figure 1. In the derated

zone, each individual capacity on the capacity placard must be multiplied by the derated

percent of full capacity. The reduced capacities maintain 85% of tipping in the derated zone.

NOTES:

1 The figures obtained indicate the stability range of that particular truck and crane

combination, only. If either the truck or crane is changed or modified, the stability

calculations must be repeated.

2 Contact IMT if you need a modified stability chart for your vehicle.

3 Rotate the crane at least 5 times using the completed figures to ensure the rating is

accurate.

4 Be sure all information is recorded on the appropriate figure, and in the service manual.

5 Record the total length of time to test the crane (total crane test and inspection time should

approximate 4 hours - 1979 SAE J765a). ________________ hrs.

Where applicable, this test conforms to SAE J765a, ASME B30.5 and ASME B30.22.

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