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Stability Testing Custom Load Charts

Services Offered

MxV Engineering offers third party stability testing of mobile cranes, aerial devices, man-lifts and other mobile equipment.  We can also develop load charts for non-standard outrigger configurations e.g. mid-span or zero-span charts.  

For retailers of mobile lifting equipment we also offer training on stability testing methods.  This allows equipment vendors to carry out testing on the units they build, then submit the results to us for review and certification via our Fleet Utility system. 

Why Stability test?

When a manufacturer designs a truck-mounted lifting device they do not necessarily have prior knowledge of the size or type of vehicle it will be mounted to. Manufacturer supplied load charts are therefore found by considering the structural suitability of the device to hold a given load. However, a truck-mounted lifting device may not necessarily be able to pick structurally limited loads due to instability of the system. The primary factors that determine stability are weight and dimensions of the truck, rigidity of the truck's suspension, the dimensions and locations of any outriggers/stabilizers and the mounting location of the crane itself.  Insufficient or improper design of the crane mounting, including the torsional rigidity of the sub-frame, may also negatively effect the stability of a truck mounted crane.  As such it is mandatory that all truck-mounted cranes sold in North America must be tested for stability.

Governing Standards

All truck mounted cranes sold in North America must meet the requirements of at least one of the following standards; CSA Z150 Safety Code on Mobile Cranes, ASME B30.5 Mobile Cranes or ASME B30.22 Articulating Boom Cranes.  It is a requirement of all of these standards that a truck-mounted crane be stability tested according to SAE J765 Crane Load Stability Test Code.

Other lifting devices such as aerial devices and man-lifts also require stability tests in complaince with the govering CSA or ANSI standards.  For example CSA C225 Vehicle Mounted Aerial Devices defines stability tests for such devices both on a slope and on the flat.

In complaince with the BC occupational health and safety regulation Section 4.8(2)(a) the results of all stability tests must be presented in a document that has been certified by a Professional Engineer 

The Test Process

The primary purpose of the stability test is to find any so called reduced capacity zones or areas in which the crane manufacturer's rated load has to be de-rated. If such zones are found the test then determines how much the load must be de-rated by. The test process, involves the crane picking the maximum rated load at a variety of different crane extensions and slewing angles. At all times during the test truck is carefully monitored for any signs of instability.

Test Personnel

As the test involves pushing your crane to the limits of stability you need to be sure that your crane is in capable hands. When choosing a crane operator we look for a number of factors; all of our test personnel have a minimum of five years operating experience, fantastic attention to detail and a proven track record of excellence in the work place. On top of all of this each of our test personnel undergoes extensive training, both theoretical and practical, so that they know exactly what to look for when testing your crane.  This, combined with the fact that we have already successfully tested and certified over one thousand cranes, means that you can be confident in the ability of our operators at all times.

The End Product

Using the test data a certified custom load chart for your crane is developed.  The chart has been designed to be easy to read and clearly shows the locations of any reduced capacity zones, and the reduction in load required. The test certificate is valid as long as the crane and truck remain in the tested configuration.  In addition to electronic copies of charts, that are always avaiable on Fleet Utility, a laminated paper copy of the chart will be provided for the end user to keep with the truck.