The frequency of load testing for mobile and crawler cranes depends on several factors, including:

 The frequency of load testing for mobile and crawler cranes depends on several factors, including: 

Usage: How often the crane is used

Environmental conditions: The conditions in which the crane is used

Regulatory requirements: Any applicable regulations

Here are some general guidelines for load testing cranes:

New cranes: Before first use and every four years after 

Uncertified cranes: At the time of initial certification and every four years after 

Major repairs or modifications: Before returning to service 

Periodic load testing: Every 1 to 5 years, depending on the factors listed above 

Crane Load Testing: Ensuring Safe And Reliable Crane Operations

Load testing is important because it helps identify any potential problems with a crane in a controlled environment. This can help prevent accidents and injuries that might occur if the crane malfunctions while moving heavy loads. 

During a load test, the crane is tested by supporting a load that is at least 100% and no more than 125% of the crane's rated capacity. The test should be dynamic, meaning it confirms that the crane can safely lift, lower, and transport the load.