Lattice Flashcards
On LBC with power load lowering mounted on the hoist, a heavy load should be lowered by what function?
Power load-lowering and foot brake
A pin-connected LBC is being dismantled, after connecting the equalizer, which pins should be removed first?
Lower pins ahead of the equalizer.
When assembling a LBC, which insert should be closet to the butt section?
10ft section
What is the term used for the length of the LBC boom that is suspended?
Cantilever Length
On a friction style mobile crane, how is power transferred to the torque converter?
Master Clutch
When disassembling or shortening a LBC, which pins shouldn’t be touched?
Any pin on any section located between the pendant attachment points and the crane.
Where is boom length measured on a LBC?
Center of the heel pins to the center of the tip sheave pins.
How should a gantry of a LBC be positioned when hoisting a suspended load?
Highest point
When assembling and disassembling a LBC, when is it safe to work under the boom?
NEVER
When handling boom sections, where is the best location for slings to be attached?
At pin connection points at the end of the chords.
Booms being assembled or disassembled on the ground without a harness should be what?
Securely blocked to prevent dropping of the boom and boom sections.
How do you install boom pins?
Inside out. Pins pointing out.
What effect does having crawlers retracted have on a mobile crawler crane?
Decreases capacity
Tipping capacity of a LBC crawler is based on what percentage?
75%
Approved blocking placed under the tips of the tracks on a mobile crawler crane will do what?
Increase the crane’s stability
The tipping axis over the side on most LBC crawler is generally in lines with what component?
Track rollers
When operating on tires, LBC truck cranes are rated at what percentage of tipping?
75%
LBC truck crane manufactured after 11/8/2011 must have what?
Outrigger position monitor
A LBC truck crane, with outriggers properly set is rated at what percentage of its tipping capacity?
85%
When do you use a Rubber Chart?
When the wheels still bear machine weight.
LBC least stable position?
Side
LBC truck crane greatest capacity quadrant?
Rear
When extending outriggers, what should the operator do from the cab?
Make visual contact with beam and jack.
LBC max ground pressure position?
Over the corner
Wood mats work best when?
When bolted together
Crane configuration depends on what?
Site conditions
Where do you find assembly and disassembly specs and guidelines?
Operator’s manual
When assembling and disassembling, suspension ropes should not what?
Interfere with pins and clips
Bent or damaged fittings cannot what?
Fit boom sections together
What type slings are best for assembling and disassembling? Where should you attach the slings?
Nylon slings. Lifting lugs, main chords, not the laces.
Where do you find information on the assembly components?
Boom rigging drawing
When does most boom damage happen?
During transportation and handling.
What happens when a LBC crawler is moved from soft to hard ground?
The ground pressure increases
How many are in a Pendant matched set?
4
What do you attach after the main hoist line and boom assembly?
Boom angle indicator
The crane operator and assemblers must have?
A way to communicate
In order to lift a longer boom off the ground it may be necessary to install _____ on the crane.
Additional counterweights
A pin/fastener can be used to assemble the boom as long as they’re secured by cotter pins. True or False?
False. Specific pins.
Before assembly, suspension ropes and pendants should be in good condition and _____.
Coiled in the drum.
A frame hinged at or near the boom hinge for use in supporting a boom is called a boom _____
Mast
A thorough inspection of ____ should be made before booming up.
Boom hoist cable
In the Jib assembly, the jib is assembled and attached to the lattice boom tip after the ____
Boom is assembled.
To utilize boom deflection, when lifting a heavy load off the ground. The boom tip should be ____
Closer to the crane than the load
Who is responsible for identifying unground hazards?
Controlling entity
_____ including blocking/cribbing must be checked around the crane for proper support.
Ground conditions
Which of the following operator aids is associated with LMI?
Selected controls lockout system
The system used to connect the personnel platform to the equipment must allow the platform to remain ____ degrees of level, regardless of boom angle.
10 degrees
Who determines successful proof test?
Competent person
Who is responsible to know what type of site conditions could adversely affect operations of the crane?
Operator
According to OSHA, accessible areas of the operating crane must always be barricades within:
The swing radius of the rear of the rotating superstructure
