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Questions and Answers
Why is it important to fit the counterweights as detailed in the load charts?
What should be specifically observed when deploying the counterweight attachment rams?
What is an appropriate action to take before lifting the counterweight?
Which of the following should be checked on the hydraulic rams and attachments?
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What happens if the counterweights are not fitted properly?
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What is the primary purpose of the Rated Capacity Charts in crane operations?
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Why is the weight of the crane important when planning lifting operations?
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Rated Capacity Charts are essential for which of the following roles?
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What must competent persons utilize Rated Capacity Charts for?
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What does the abbreviation R.C.L. stand for in the context of crane operations?
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What type of terrain would necessitate careful consideration of a crane's weight for transport?
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What is a crucial factor that Rated Capacity Charts assist crane operators in inputting?
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During a thorough examination, what aspect does a competent person specifically check according to the Rated Capacity Charts?
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What should be checked to ensure the rated capacities are accurate?
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Which factor should NOT be considered when determining overload testing?
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What is the purpose of carrying out a functional test with no load applied?
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Which of the following must be clearly marked on the outrigger during load testing?
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What do the manufacturer's duty charts specify in relation to counterweights?
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What is the primary aspect to verify during the functional test of a crane?
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What must be taken into account regarding the outrigger during load testing?
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Which of these is NOT a support system for mobile cranes?
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Study Notes
Rated Capacity Charts
- Rated Capacity Charts (R.C.L.s) are essential for safe lifting operations and crane calibration.
- They provide critical information for crane operators to ensure operations stay within design parameters.
- Competent persons rely on these charts for thorough examinations and functional tests of mobile cranes.
- The crane's weight is crucial for safe transportation and compliance with road or excavation weight restrictions.
Counterweights
- Correct fitting of counterweights is necessary for optimal boom lengths and radius operation.
- Observation during counterweight deployment is vital to ensure hydraulic rams extend and lock properly.
- Operators should monitor system displays for the correct sequence of operation and check for leaks or damage to hydraulic systems.
Rated Capacities
- Rated capacities must match across manufacturer’s certificates, load radius indicators, and RCI/RCL instruments.
- A functional test without a load is required to verify functionality of controls, switches, and limit systems.
- Checking brake adjustments and the operational status of limit switches is essential for safe crane operation.
Support Systems and Load Testing
- Mobile cranes have diverse support systems, such as crawler tracks, tyres, and outriggers that influence stability.
- The competent person must consider these systems when deciding on overload testing conditions.
Outriggers
- Intermediate extension positions of outriggers need clear, durable markings as per manufacturer guidelines.
- Duties and rated capacities for outrigger extensions should be referenced from the manufacturer’s duty chart.
- RCI/RCL must support specified intermediate extensions as indicated by the manufacturer.
Impact of Counterweight Variations
- Counterweight variations significantly affect crane stability.
- Manufacturer’s duty charts detail ratings associated with specific counterweights to ensure safety and efficiency.
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