Pre-Test Procedures For Mobile / Crawler Cranes

Check that an operators manual and load chart for the crane in the configuration that it will be tested is available and review same for operational limitations.

Determine that lifting gear to be used with the crane in normal duties or for the purpose of testing the crane has already been tested independently. Check that all lifting attachments are clearly marked with their safe working load.

Review previous test and inspection certificates, wire rope inspections, and deficiency reports and determine that any necessary corrections have been made.

Review periodic inspection reports, maintenance records and documentation of repairs to determine that all work was in order.

Choose appropriate proof loads for the test based on the manufacturer‘s load ratings for the condition of use. These shall consist of the application of proof loads as close as possible to, but not exceeding, 110% of the load ratings for the boom on the crane. Proof loads shall be applied at the design maximum and minimum boom angles or radii or as close to these as practicable and at such intermediate radii as the certificator may deem necessary to verify the load chart and to verify line pull on all load hoists. A test load must also be selected for the partial load test which is done prior to the proof load tests. An intermediate proof load at less than rated radius can be used for this purpose. Reeving configuration must be recorded.

If the crane is equipped with a jib or rated on rubber in addition to outriggers, specific proof loads shall be chosen which will provide an appropriate test for the alternative condition in accordance with the load chart. (NOTE: Extreme caution must be exercised when testing on rubber. Tire pressures and work areas noted on load charts must be strictly followed.)

Rigging which conforms to safety standards for a safe lift must be selected for the test loads.

The crane shall be set up level in all directions, within acceptable tolerances, with suitable clearance from any obstructions. The operating surface should be firm and give sufficient support for the bearing pressures that will be generated during the testing procedures. Care must be exercised in following the manufacturer’s instructions for proper set-up.

Barriers should be set up around the operating perimeter if there is any possibility that personnel or vehicles will intrude into the operating region.

A pre—test conference should be arranged with the operator, the riggers, and the signalman to establish how the test will be conducted and to review the signals to be used.

Inspect the crane in its entirety according to the checklist normally used for that type of crane. Particular attention should be given to the structural elements of the crane which will be subjected to stress during the load testing procedure. Any evidence of degradation among the structural elements should be evaluated and a determination made as to the suitability of the crane‘s condition for load testing and the need for nondestructive testing or dismantling for detailed , examination.

The crane should be operated without a load through its full range of operation. All safety devices should be checked for appropriate function, including accuracy of all safety indicators.