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237 Cards in this Set
- Front
- Back
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Prior to initial use all new and altered cranes shall be tested to insure compliance with this section including the following functions: |
Hoisting and loweringTrolley travelBridge travelLimit switches, locking and safety devices |
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The trip setting of hoist limit switches shall be determined by tests with an empty hook traveling in ........ speeds up to the maximum speed. The actuating mechanism of the limit switch shall be located so that it will trip the switch, under all conditions, in sufficient time to prevent contact of the hook or hook block with any part of the trolley |
increasing |
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Test loads shall not be more than ........ percent of the rated load unless otherwise recommended by the manufacturer. These test reports shall be placed on file where readily available to appointed personnel. |
125 |
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........ of rope diameter below nominal diameter due to loss of core support, internal or external corrosion, or wear of outside wires |
Reduction |
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A number of broken outside wires and the degree of distribution or ........ of such broken wires |
concentration |
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Some of the conditions that could result in an appreciable loss of strength are the following: |
*Reduction of rope diameter below nominal diameter due to loss of core support, internal or external corrosion, or wear of outside wires.*A number of broken outside wires and the degree of distribution or concentration of such broken wires.*Worn outside wires.*Corroded or broken wires at end connections.*Corroded, cracked, bent, worn, or improperly applied end connections.*Severe kinking, crushing, cutting, or unstranding |
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Wear and damage to wire rope can’t always be seen on the surface. What us another method of inspection. |
Magnetic Rope Inspection |
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3 Major Components of Industrial Overhead Cranes |
*Bridge *Trolley *Hoist |
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What is the Bridge |
The bridge is the track for the crane. There are two different types of bridges for industrial overhead cranes. ... |
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What is the Trolley |
The trolley is the vehicle that travels on the bridge. There are three types of trolleys. ... |
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What is the hoist |
The hoist lifts the load up and down. |
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What are the 2 types of Bridges |
*Single Girder *Double Girder |
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A double girder bridge uses two girders. Double girders permit a ........... But double girders are heavy, so they need support within the building foundation. |
higher height to hoist objects, and they support very large weights |
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A single girder design uses one girder. Single girder designs allow for ........., and they are low maintenance and easy to install. But a single girder cannot support large weights |
easier movement |
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What are the 3 types of Trolleys |
*Plain *Geared *Motorized |
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A plain trolley is the simplest design. The operator pushes or pulls the trolley into position. The operator grabs ........ |
the load by hand and positions it along the bridge. |
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A geared trolley is more complicated. The hoist operator .......... The trolley then rolls along the bridge |
pulls on a chain hanging from the trolley, which has gears attached to the chain |
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A motorized trolley has a motor attached to its wheels. A control pendant hangs from the bridge, and the operator presses buttons to move the trolley along. Motorized trolleys are ......., so you need to take safety precautions |
Fast |
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Before using your hand to steady any load, you should?
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follow company policy
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According to OSHA, the rated capacity of all overhead cranes shall be?
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clearly marked on the side of the crane
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According to O.S.H.A., when is the proper time to check the hoist brake?
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during the first lift
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An object weighs 150 pounds per cubic foot, it measures 5' long X 3' wide X 2' high, how much does it weigh?
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4,500 pounds
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According to O.S.H.A. the operator shall not hoist loads above?
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personnel
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According to OSHA, rated capacity rigging charts will aid you when?
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determining if the rigging equipment meets all criteria established by law
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What is the minimum safety factor for overhead crane wire ropes?
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3.5 to 1
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What is the term used to describe very short movements during hoisting operations?
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inching
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Who should establish a maintenance program for an overhead crane?
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manufacturer
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Long loads should be handled by which of these below the hook lifting devices?
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spreader beam
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Overhead cranes with more than one hoisting unit shall have what?
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its rated load marked on it
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What is the purpose of the "E" (Emergency) stop on an overhead crane?
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removes power to entire crane
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Most loads should be rigged to within how many degrees of level?
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five
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According to ASME B30.2 a frequent inspection must be performed by a?
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designated person
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According to ASME B30.2, the maximum twist of the hook can't exceed?
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10 degrees
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When inspecting electrical contacts, what are the signs they are bad?
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pitted or burned
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According to ASME B30.2, what type of fire extinguisher is required for overhead cranes?
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10BC
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Before leaving an overhead crane unattended, attached loads should be?
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lowered to the floor
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What should be done with an unbalanced load?
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lower load to the floor
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When making a lift, where should the load block be positioned? |
vertically over the load's center of gravity |
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The term "Lay Length" when referring to wire rope is equal to? |
the distance it takes one strand to make one complete revolution around the center core |
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What are the runways on which the crane runs up and down the plant called? |
rails |
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Which device shall be provided for outdoor stored bridge cranes? |
wind indicators |
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Which of the following regulations applies to overhead cranes? a)O.S.H.A. 1910.179 b)A.S.M.E. B30.5 c)O.S.H.A. 1910.180 d)A.S.M.E. B30.3 |
O.S.H.A 1910.179 |
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Overhead cranes should be parked in? |
an area where it will not cause an unsafe condition |
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The hoist limit switch which controls the upper limit of the load block.. (finish phrase) |
shall not be used as an operating control |
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When inspecting the electrical connectors on the trolley of an overhead crane, which of the following is cause for concern? a) No warning label. b) Un-even welds. c) Pitting and wear. d) Lagging and wire rope. |
pitting and wear |
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How often does O.S.H.A. require a written wire rope inspection? |
once a month |
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According to ASME B30.2, what is the safety factor for rigging? |
5 to 1 |
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According to O.S.H.A. frequent Inspections shall be performed when? |
daily to monthly |
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When attaching spreaders to any load, you must keep in mind of what |
the lower the spreader angle the greater the tension
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What is the order of hitch strength? |
basket, vertical, choker |
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What is a verticle hitch and its rated strength? |
In single vertical hitch a sling is used to connect a lifting hook or other device to a load. In this configuration the total weight of the load is carried by a single leg, the sling horizontal angle is 90º (angle between horizontal line and sling), and the weight of the load can equal the maximum working load limit of the sling. This hitch provides absolutely no control over the load because it permits rotation. A tagline should be attached to prevent rotation which may damage the sling. |
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What is a basket hitch and what is its rated strength? |
The single basket hitch is used to support a load by attaching one end of the sling to the hook, then passing the other end under the load and attaching it to the hook. One shall ensure that the load does not slide along the sling during lifting. The capacity of basket hitches is affected by their sling angles. |
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What is a bridle hitch and what is its strength? |
Two or more sling hitches can be used together to form a bridle hitch. This configuration provides good load stability when the load is distributed equally among the legs (symmetrical objects), the hook is directly over the load’s center of gravity and the load is raised level. In case of non-symmetrical objects (off-center loads), a sling leg may be fitted with a turnbuckle to adjust the length to level it. Instead of a turnbuckle, come-along of adequate capacity may be also used. Proper use of a bridle hitch requires that sling angles are carefully measured to ensure that individual legs are not overloaded. Because the load may not be distributed evenly, when more than two slings (3 or 4 leg slings) are used, load may be carried by only two legs while other legs are only balancing it. Unequal length sling legs may be one reason for this. In view of this, it is recommended to assume that the load is carried by two legs only and the sling may be rated as two leg sling. If a qualified rigger or rigging specialist ensures that the load is evenly distributed, the full use of all the legs is allowed.Note:All wire rope sling capacity tables (e.g. in ASTM B30.9 and Wire Rope Users Manual) consider all legs sharing equal loads. |
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What is a double basket hitch and what is it's strength? |
The double basket hitch consists of two basket hitches passed under the load. They must be placed under the load so that it is balanced. The lags of the hitches must be kept far enough apart to provide balance but not so far apart that low angles are created and the legs pull in towards the centre. The angle between the load and the sling should be approximately 60º or greater to avoid slippage. On smooth surfaces, both sides of the hitch should be snubbed against a change of contour to prevent the sling from slipping as load is applied. Otherwise use a double wrap basket hitch. |
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What is a double wrapped basket hitch and what is it's strength? |
The double wrap basket hitch is a basket hitch wrapped completely around the load and compressing it rather than merely supporting it, as done by the ordinary basket hitch. The double wrap basket hitch can be used in pairs like the double basket hitch. This arrangement is used for handling loose material, pipes, rods, or a smooth cylindrical load because the sling is in full 360º contact with the load and tends to draw it together. |
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What is a single choker hitch and what is it's strength? |
The single choker hitch forms a noose in the rope. It does not provide full 360º contact with the load. It should not be used to lift loads difficult to balance or loosely bundled. The hitch reduces lifting capacity of a sling as this method of rigging affects the ability of the wire rope components to adjust during the lift, places angular loading on the body of the sling and creates a small diameter bend in the sling at the choke point. |
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What is a doubled choker and what is its' strength? |
The single choker hitch can be doubled up to provide twice the capacity or to turn a load as shown below (Doubling a single choker hitch is not the same as using a double choker hitch.). |
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What is a double choker hitch and what is it's strength? |
The double choker hitch consists of two sling chokers attached to the load and spread to provide load stability. |
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What is a double wrap choker hitch and what is it's strength? |
Double wrap choker hitch is formed by wrapping the sling completely around the load and hooking it into the vertical part of the sling. This hitch is in full 360º contact with the load and tends to draw it tightly together. It can be used either single on short, easily balanced loads or in pairs on longer loads. |
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What are endless slings or grommet slings? |
Endless slings are used for all three types of basic hitches as shown above. They are made from wire ropes, chains and synthetic materials. They are flexible but tend to wear faster than other slings because normally they are not fitted with fittings and deforms when bent over hooks. |
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What is sling angle? |
The loading in any type of sling is affected by the angle of the sling leg. Any angle other than vertical (sling angle = 90º) at which the sling is rigged, increases the loading (tension) on the sling. Due to this, sling’s working load limit reduces. As the angle decreases the stress imposed on the leg of a sling increases. This angle, which is measured between a horizontal line and the sling leg or body, is called sling angle or horizontal angle as shown below. |
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Sling’s working load limit (WLL) can be calculated by applying ........... function (for stress calculation) as under. |
trigonometrical |
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Sling’s working load limit = Sling’s vertical capacity x ...... of horizontal angle. |
sine |
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Sling’s Working Capacity = Factor x Sling’s Rated Capacity. Where Factor shall be taken based on sling angle from following table. |
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As sling stresses increase tremendously with angles smaller than 45°, it is recommended not to use sling angle ......... Low sling angles also create large horizontal compressive forces in the load which may be sufficient to cause buckling, especially in long flexible loads. If two or more slings are used, the minimum horizontal angle shall be used for calculating working capacity. |
less than 30º |
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Each rule is based on the safe working load of a sling in vertical hitch of a given size and material and the ratio H/L, where H is the vertical distance of the hook to the top of the load and L is the distance, measured along the sling, from the saddle of the hook to the top of the load as shown above. |
If it is not possible to measure the entire length of the sling, measure along the sling from the top of the load to a convenient point and call it distance “l”. From this point measure vertically down to the load and call it distance “h”. The ratio h/l will be the same as the ratio H/L as shown in above sketch. Either H/L or h/l will apply equally to the following methods.Note:When sling legs are not of equal length, use smallest H/L ratio. |
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According to OSHA, the maximum hook throat opening must not exceed what? |
15% of its original size |
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How many cubic feet is in a rectangular object that measures 5 ft. X 3 ft. X 2 ft.? |
30 cubic feet |
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An object weighs 150 lbs per cubic foot and measures 4 ft. X 3 ft. X3 ft., what is its weight? |
5,400 lbs |
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According to OSHA, how many wraps must be left on the hoist drum of an overhead crane with the hook at its lowest position? |
3 wraps |
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The upper limit switch of all overhead cranes shall be tested every? |
shift |
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What is the vertical movement of an overhead crane is controlled by? |
hoist controller |
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A swinging load should be controlled by the? |
bridge and trolley controller
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What should be the first step in a daily inspection of an overhead crane? |
check the main switch |
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When energizing the crane, the controller should be in what position? |
neutral |
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According to A.S.M.E., warning signals shall be given when? |
starting and during movement |
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According to A.S.M.E.B30.2, an overhead crane equipped with a lower limit device can have how many wraps left on the drum at its lowest point? |
one |
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In the event of an emergency, who may give the stop signal? |
anyone |
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According to ASME B30.2, before lifting a load the hoist ropes will be free of kinks and? |
untwisted |
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What is the purpose of the upper limit switch? |
limit hoist travel |
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Where should the hook block be positioned for shutdown? |
near the upper limit |
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Whose responsibility is it to select the proper rigging equipment? |
supervisor |
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What should an operator first determine before making a lift? |
weight of the load |
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A wire rope designated as 6 X 19 has? |
6 strands with 19 wires |
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What is the safe working load (SWL) of a wire rope defined as? |
breaking strength divided by safety factor |
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What is the vertical movement of an overhead crane controlled by? |
hoist controller |
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Swinging loads can be controlled by the use of the ? |
bridge or trolley controls |
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What is the first step in a daily inspection? |
main switch locked in off position |
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If the load does not balance properly after being raised, what step should be taken? |
lower the load to the ground |
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When making a lift, what position should the trolley be in? |
vertical to the load |
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What position should all controllers be in when energizing? |
either neutral or off |
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ASME B.30.2 states that the minimum number of wraps on the hoisting drum should never be less than ______________unless a lower limit device is provided. |
two wraps |
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Before leaving a crane cab unattended, any attached load shall be? |
landed |
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What is the purpose of the upper limit switch (the only one required by OSHA)? |
limit the hoist travel |
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When any machinery or apparatus is found to be defective or inoperative on the crane, the person discovering this condition should do what? |
report it to the supervisor |
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If a loss of power occurs, what should the crane operator do? |
put controllers in off position |
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An object to be lifted is rectangular in shape and measures 5' long x 3' wide x 2' high. What is the volume of this object? |
30 cubic feet |
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A floor weight limitation is posted at 700 pounds per square foot maximum. Before lowering a load down onto this floor that is calculated at 900 pounds per square foot, what must be done? |
install cribbing to increase surface bearing area |
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If possible, always try to keep horizontal sling angles at what degree?
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greater than 60 degrees
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Whenever a situation calls for placing both ends of a sling into a hook or placing more than one sling into a hook, what piece of rigging hardware for making this connection should be used? |
A shackle or clevis. |
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How can shock loading of rigging equipment be prevented? |
by applying loads to rigging equipment more slowly when lifting |
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Which of the following standards applies to overhead cranes? a)OSHA 1910.134 b)ASME B30.5 c)PCSA 1926.550 d)ASME B30.2 |
ASME B30.2 |
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What type of control operation do Floor operated overhead cranes use? |
pendant |
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The term plugging refers to? |
reversing power for stopping |
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When hoisting, which position of the hoist controller will result in the slowest speed? |
first position |
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Steel Plate weighs 40 pounds per inch, What is the approximate weight of a steel plate 8 ft. long, 5 ft. wide and 3 inches thick? |
3,800 lbs |
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Overhead cranes may be modified provided they are checked thoroughly by a?
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qualified engineer
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All hooks should come equipped with a? |
safety latch |
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What precaution should be observed when using 3 and 4 legged bridles? |
all legs don't always share equal parts of the load |
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Extreme caution should be used when using the hoist for lifting? |
near to the limit switches |
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Which item listed below, must be marked on all overhead cranes? a)Manufacturer name. b)Maximum capacity. c)Rated capacity. d)Model of crane. |
rated capacity |
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Whenever rigging equipment is found to be defective, what step should be taken? |
consult your supervisor for the proper method to remove the defective item from service |
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When using a remote or radio control, it is important to? |
change battery at beginning of shift |
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Before using rigging, the operator should be aware of the? |
highest capacity rating |
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What should you do when the hook or load is moving above personnel? |
sound a warning signal |
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Cranes shall not be used for side pulls unless? |
specifically authorized by a responsible person |
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According to OSHA, power supply to the runway shall be controlled by? |
the switch or circuit breaker
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ASME B30 standards are designed to? |
recommend safety |
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What is the ASME volume that pertains to overhead cranes? |
B30.2 |
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According to OSHA, what type of chain should be used by an overhead crane? |
alloy |
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According to ASME B30.2, the removal criteria for regular lay wire rope is four broken wires in one strand, in one lay or twelve randomly distributed broken..(finish phrase) |
wires in one lay |
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Is this a correct way to rereel wire rope from horizontally supported reel to drum? |
Yes. When re-reeling steel wire ropes from horizontally supported reel to another drum, make sure that the rope is traveling from the top of the reel to the top of the drum or bottom to bottom to avoid a reverse bend. |
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Is this a correct way to rereel wire rope from horizontally supported reel to drum? |
No |
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Is this a correct way to rereel wire rope from horizontally supported reel to drum? |
No |
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When re-reeling steel wire ropes, make sure the surface of the drum is .......... to protect wire ropes from damages by foreign particles. |
clean, smooth and dry |
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The right hand normally is used to determining right-lay wire ropes and the left hand for left lay wire ropes when standing toward the drum. The clenched fingers represent the drum and the extended finger stands for the oncoming rope. |
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The right hand normally is used to determining right-lay wire ropes and the left hand for left lay wire ropes when standing toward the drum. The clenched fingers represent the drum and the extended finger stands for the oncoming rope. |
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The right hand normally is used to determining right-lay wire ropes and the left hand for left lay wire ropes when standing toward the drum. The clenched fingers represent the drum and the extended finger stands for the oncoming rope. |
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The right hand normally is used to determining right-lay wire ropes and the left hand for left lay wire ropes when standing toward the drum. The clenched fingers represent the drum and the extended finger stands for the oncoming rope. |
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What are the lays of wire rope? |
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What are the lays of wire rope? |
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Which OSHA regulation listed below can you find information about hoisting slings?a) 1910.184b) 1910.550c) 1910.180d) 1910.601
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1910.184
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When given the signal (stop signal), what will the operator do? |
bridge travel |
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If the load does not balance after raising it off the floor, what steps should you take? |
lower to the floor and adjust the rigging |
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According to OSHA, frequent inspections are to be performed at what intervals? |
daily to monthly |
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If a crane is modified and re-rated it must be checked thoroughly by a? |
qualified engineer |
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When shall inspection of below the hook devices be performed? |
during the shift |
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Which of the ASME standards listed are for below the hook lifting devices? a) ASME B30.20 b) ASME B30.19 c) ASME B30.79 d) ASME B30.10 |
ASME B30.20 |
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When preparing to use a remote or radio control device, it is important to? |
change battery at the beginning of the shift |
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Who can authorize side loading of an overhead crane? |
qualified person |
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What is the purpose of a restraining cord used on the pendant control box of an overhead crane? |
prevent strain on electric cord |
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Which of the items listed below is effected the most by side loading an overhead crane? a) The trolley rails. b) The wire rope. c) The drum lagging. d) The bridge girder. |
the wire rope |
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Where is the best place to park an overhead crane? |
safe place out of the way |
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Describe what signal is a Trolley Travel? |
palm up, fingers closed, thumb pointing in direction of motion, jerk the hand horizontally |
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movement of a crane after the power is shut off, possibly by trolley or hoist movement |
Bridge drift |
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movement of the crane from one end of the building runway to the other |
Bridge travel |
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Describe the cab. |
The cab is usually hung under the bridge and contains crane controls |
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Centering happens in three motions, what are they? |
-center bridge over loading area -center trolley over loading area -lowering and raising of hoist over load |
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What are controls? |
controllers in the cab give motion to the bridge, trolley, and hoist. control panels are located on the walkway of the bridge. can be pendant and remote |
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are applied by foot pressure on brake pedal |
Mechanical crane braking |
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are applied mechanically when the hoist is not powered |
electrical crane braking |
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dynamic crane braking is: |
eddy current braking occurs when the hoist is being lowered without a load |
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drive motors |
motors that power the bridge, trolley, hoist |
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hoist |
hoist mechanism raises and lowers the load. it is drum mounted on the trolley which is spooled with wire rope and is driven by a motor gearing system |
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this hoist is similar to the main hoist but has less lifting capacity |
hoist (auxillary) |
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consists of sheaves which turn on bearings and a swivel hook that is suspended by the hoist cable |
hoist block |
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the load block is raised and lowered by the operator controls |
hoist movement |
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connected to the hoist block and is used to lift loads. hook safety latch prevents the slings or chains from slipping off the hook |
hook |
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an end truck of bogie wheel that does not drive |
idler |
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movement of the block and load caused by acceleration or deacceleration of the crane
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load
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the motor powered shaft driving the bridge |
main line shaft |
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a drag brake which is engaged only while lowering. when hoisting the brake releases eliminating the drag on the motor |
mechanical load brake |
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load heavy enough to pull through the friction of the hoisting mechanism. the motor must be aided in holding back the load by a mechanical load bake or by dynamic lowering control |
overhauling load |
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operators crane controller box hanging from the bridge or trolley by a cable. must be supported so as to eliminate any strain on the electrical connections |
pendant control |
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radio signals can be transmitted from an operator on the floor with a control box to a receiver on the crane |
radio control |
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occurs when the initial lifting tension is applied to the hoist wire rope and the load chains or slings |
slack out |
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frame which consists of end trucks, drive motors, hoist motor and a drum with wire rope and a hoist block. it is operated through controllers and it travels on rails across the bridge structure while supporting the load |
trolley |
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hoist assembly of drum minimum requirements |
no LESS than TWO wraps of wire rope on the hoist drum when the load block is at its lowest position |
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The load plus the weight of the hook block divided by the number of parts of line shall not exceed 20% of the wire rope nominal breaking strength is covered by what? |
ANSI Standard B30.2 |
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........ states that require two full wraps shall remain on the drum with hook in its lowest position. |
OSHA 1910.179 |
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what are the rails that are attached to the building columns on either side of the bay? |
runways |
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what is it called when the girders are not perpendicular to the runway rails? |
skewing |
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what is the use of reverse motor power to stop a forward moving load? |
plugging |
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what is the term used to indicate very short movement? |
inching |
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what are the power cables that are hung in drape curves on the crane called? |
festoon |
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what kind of braking uses Eddy current braking? |
dynamic |
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what kind of brakes are applied mechanically when the hoist is not powered? |
electrical |
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what kind of a brake uses foot pressire on a pedal? |
mechanical |
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what are the 3 types of crane braking?
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mechanical, electrical, dynamic
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what is located on both sides of the bridge and trolley to prevent over travel? |
bumpers |
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how many wraps must be on a drum when the load block is at its lowest position? |
2 wraps |
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what are the girders that are connected on each side of the bay that sits on the runway called? |
the bridge |
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ANSI standard for overhead cranes? |
B30.2 |
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what should be done before lifting the load? |
determine the weight of the load |
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A hoist limit switch is triggered when the block contacts and raises the weight. What is suspended from the counterweighted limit switch? |
the weighted switch |
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when should limit switches be checked? |
the beginning of each shift |
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operating the trolley over long distnaces with intermediate speeds may do what? |
heat up the motor |
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whenever possible you should keep one hand on what? |
the hoist |
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If you accelerate and stop gradually what does this avoid? |
excessive draft |
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on a three light system, what does the RED light indicate? |
1. Crane is not to be moved under any circumstances 2. Crane is not manned 3. Crane is out of service |
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on a three light system, what does the GREEN light mean? |
1. Crane is operational 2. Crane is manned 3. Operator must be in cab |
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What is the working range for a radio reception? |
120 to 160 ft |
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what kind of service operates at LESS than 85% of the rated load with no more than 10 lifts an hour? |
normal service |
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on a hook block on an overhead crane, the hook may have how much twist and how much opening? |
10 degree body twist 15% opening |
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what are the 3 motors that drive a standard overhead crane? |
1. Bridge 2. Trolley 3. Hoist |
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what should be done before loading or unloading a crane? |
centering |
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How do you secure an overhead crane? |
1. Park the crane at an authorized platform
2. Secure the trolley next to the cab 3. Raise the hoist block just below limit switch. 4. Position controls to the off position 5. Open Mon switch 6. Turn on red light 7. Put on parking brake |
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what kind of service is operating at 85% of the rated load and OVER 10 lifts per hour? |
heavy service |
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what is position 1 used for on the hoist controller? |
unloaded hook |
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what is position 3 on the hoist controller used for? |
smooth start on heavy loads |
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what is position 2 used for on the hoist controller? |
smooth start of medium loads |
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what is the OSHA standard for overhead cranes? |
1910.179 |
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what components shall be provided for outdoor bridge cranes? |
rail clamps and wind indicator |
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what type of fire extinguisher should NOT be used? |
carbon tetrachloride |
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what procedures are used when the load approaches near or over personel? |
A warning signal shall be sounded |
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what is a hoist limit switch that is operated when the load block hits a lever pulling contacts apart interrupting the hoist and circuit? |
the paddle type |
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what is a hoist limit switch that is attached to a shaft in the hoisting mechanism? |
the rotating gear type |
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what are the three basic types of hoist limit switches? |
1. the paddle type 2. the weighted switch 3. the rotating gear type |
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what must be checked when lifting a heavy load? |
the hoist brake |
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when lowering a heavy load, it is recommended NOT to use what speed?
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2nd, 3rd, or 4th
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as the numbers increase, will the speed increase or decrease? |
increase |
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by pulling the lever backwards, what will the hook do? |
the hook will raise |
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by pushing the lever forward, what will the hook do? |
the hook will lower |
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what capacity rating does a sister hook usually have? |
over 60 tons |
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what capacity rating does a single hook usually have? |
up to 60 tons |
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wire rope has a safety factor of what? |
5 to 1 |
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what does the hoist consist of? |
1. Hoist motor 2. Speed reducer 3. Hoist brake 4. Drum 5. Wire rope 6. Hoist block 7. Hook |
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what kind of service happens under abnormal operating conditions when dealing with a normal or heavy service? |
severe service |
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What is the purpose of placing mats or cribbing under outrigger floats? |
Distribute over a larger area. |
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Where is the best location for leveling a crane? |
Upperworks. |
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Before leveling a mobile crane on outriggers, an operator should ensure: |
there is no weight of the crane bearing on any tires |
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Operating a mobile crane with a long boom, on uneven ground, what support condition should be considered? |
Keeping a 90° angle between cylinder rod and pad.
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Mobile cranes should be level to within what percent of grade? |
1% |
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What are the things to look for when inspecting a hook? |
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