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A comprehensive set of questions and answers related to the operation of nccco lattice boom crawler cranes. It covers various aspects of crane operation, including boom assembly, disassembly, load handling, safety procedures, and ground pressure considerations. Valuable for individuals seeking to understand the practical aspects of operating lattice boom crawler cranes.
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On a lattice boom crawler crane, the main boom length is measured from the: - ANSWER Center of the boom heel pins to the center of the boom tip sheave What is the main purpose of mid point suspension pendants? - ANSWER To absorb shock that comes with dynamic loading The main purpose of a gantry or a mast on a crane is: - ANSWER To increase the crane's leverage on the boom What effect does having the crawlers retracted have on a crawler crane with a long boom - ANSWER Increases the probability of tipping When using a mobile crane on a barge, the crane's load capacity chart shall be - ANSWER Replaced by a list chart Blocking can be placed under the ends of tracks to: - ANSWER Increase the crane's stability when operating over the front or back A crawler crane is based on ________ stability of static load. - ANSWER 75% What quadrant produces the least amount of ground pressure on a lattice crawler - ANSWER Side When a crawler crane is on a barge, the list chart must be provided by the - ANSWER Manufacturer
When operating a crawler crane, the ground pressure will always be highest over the - ANSWER Corner Unless working in loos soft soil, a crawler crane should always travel _____ on pick and carry operations - ANSWER Towards the load Why use mats of cribbing - ANSWER To reduce ground pressure The primary purpose for a rooster sheave or auxiliary boom point sheave is to - ANSWER Separate the whip and main hoist lines When operating near powerlines, how far must you be if the voltage is >50-200 - ANSWER 15' When operating near powerlines, how far must you be if the voltage is >200-350 kV - ANSWER 20' When operating near powerlines, how far must you be if the voltage is >350-500 kV - ANSWER 25' When operating near powerlines, how far must you be if the voltage is >500to 750 kV - ANSWER 35' When operating near powerlines, how far must you be if the voltage is >750-1000 kV - ANSWER 45' When operating near powerlines, how far must you be if the voltage is >1000 kV - ANSWER Determined by utility/owner
After the crane has been checked out and before crane lift operations begin the crew should: - ANSWER Have a pre-lift meeting According to OSHA 1926.1431 personnel platforms lifts should not be made with wind in excess of - ANSWER 20 MPH When is it safe to work near de-energized power-lines? - ANSWER When utility company says lines are de-energized and have been visibly grounded at the work site. When assembling a lattice boom on most crawler cranes using inserts of different lengths, which insert section generally should be closest to the boom foot - ANSWER 10' How does high wind effect cranes with a long boom - ANSWER It introduces side load onto the boom Mats are usually _____ to hold together. - ANSWER Bolted A crawler crane traveling forward is defined as traveling in the direction of - ANSWER The idler When disassembling or assembling booms on lattice boom cranes, it is extremely important to - ANSWER Never touch any pin on any boom section located between the pendant attachment points and the crane On a lattice boom crane, the device that automatically stops the boom when it nears the maximum angle is the - ANSWER Boom hoist kick out When is it safe to handle loads under power lines - ANSWER The load nor any part of the crane can come closer than regulations allow Manufacture specs only permit a certain amount of boom to be suspended out past the connection point of the pendants during assembly or disassembly of the boom. This portion of boom is called the - ANSWER Cantilever Length
When installing a pin-connected lattice boom on a mobile crane, you should always - ANSWER Use the boom hoist pawl to hold the boom When making a lift with a lattice boom crawler crane, ground pressure can be reduced by lifting over the - ANSWER Side Pendant spreader bars on long booms are used to prevent - ANSWER Main pendants from scrubbing the boom sides By order of hitch strength, which is the correct answer - ANSWER Basket, vertical, choker When taking a side strain on a boom, what concerns the operator most - ANSWER Boom Damage You should always have at least how many wraps on a hoist drum - ANSWER 2 How many broken wires in one strand must there be to remove a running wire rope from service - ANSWER 3 During disassembly of a long boom, the hog lines are connected at the maximum cantilever point and the boom is slightly lifted off the ground. Which pins are to be removed next - ANSWER The bottom pins ahead of the cantilever points Boom Assembly - ANSWER Always install upper pins first Extended Crawlers Will - ANSWER Increase over side capacities When operating a crawler crane, what is the most unstable allowable quadrant of operations - ANSWER Side