Mobile 3 Operating and special operations Flashcards
Unless otherwise stated in the manual how must you extend the boom sections and why
The boom sections must be sent out evenly and in sync
The load charts are based on equally extended sections
How do pinned booms extend sections
One at a time and the grabber returns to the heel to retrieve next section
What are the four industry standard ways of identifying load weight
Load weight on the load itself
Shipping bills, drawings, catalogues
Load weighing devices
Estimate using trade calcs
What method would be a serious mistake to use determining an unknown weight
Test lift
What two criteria are a must to determine a loads COG is stable
The cranes hook is directly over the COG
the COG is below the attachment points
Can boom angle indicators be relied on for critical lifts ?
No
Give two reasons boom angle indicator should not be used and what you must do if the indicator is being used
The indicator can have as much as a 2 degree reading error which substantially effects the GC
The indicators are mounted one the base section and may not register the deflection of the extended sections under heavy load especially if wear pads are worn consequentially the boom angle may be lower than it reads
You must assume the correct reading to be lower than what indicator says
Name the seven most common criteria for a critical lift
Multi crane lifts
Lifts over or near operating equipment
Lifts over or near power lines
The gross load exceeds 75% of gross capacity
Lifting personnel
Non standard crane configurations
The load weight exceeds a set limit
What is often necessary to provide for the rigging job
A blue print or drawing including information regarding the load and the crane site conditions must be present. The starting travel and final positions must be known
WhT is not always required for a critical lift
A print but all details must be known eliminating any guessing
What are 6 things that must be in order before a critical lift
Ground conditions must be compacted
Crane perfectly level
Crawlers will need bearing Matt’s
Radius, boom length, boom angle known
Total gross must be known
Charts must match info in plan
Who should be involved in a lift and who should be in the crane
Competent personnel only
Experienced operator
What is a job used for
To reach higher and over obstacles
What is the most dangerous part about working with jibs
Installation
What is Jib capacity rated on
Strength
