Term
| How is a crawler different from a truck mount? |
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Definition
| Crawler uses tracks instead of tires |
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Term
Crawler cranes are usually larger than 100T in capacity
T/F? |
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Definition
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Term
| Identify 2 types of track frames used for crawler cranes? |
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Definition
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Term
Track frames can be designed for either mechanical or hydraulic driving systems
T/F? |
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Definition
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Term
| How does a mechanically driven system derive its power? |
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Definition
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Term
| List 5 parts of a track assembly |
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Definition
Drive end
Idler end
Drive tumbler
Idler tumbler
Drive sprockets |
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Term
| What is the purpose of the front tumbler assembly? |
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Definition
Adjust tension, alignment,
Proper function of the track assembly |
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Term
| What is the purpose of the rear drive sprocket assembly? |
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Definition
| Drive the track assembly & alignment |
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Term
Adjustment of the front tumbler assembly and the rear drive assembly are very similar in procedure
T/F? |
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Definition
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Term
Proper tensioning of a drive chain is not at all necessary
T/F? |
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Definition
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Term
| What is the purpose of the horizontal travel shaft assembly? |
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Definition
| To transfer motive power from the vertical travel shaft to the intermediate horizontal travel shaft |
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Term
| What are the functions of the intermediate travel shafts |
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Definition
| To continue the transfer of power from the horizontal travel shaft to the chain sprocket shaft housed in the track frame |
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Term
| What type of clutch is used to provide a means of steering and propelling a crawler crane? |
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Definition
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Term
| What is the purpose of the safety interlock in a steering system? |
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Definition
| Keeps one set of jaw clutches engaged in the propel position at all times |
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Term
| List 2 functions of the travel lock assembly used with steering systems? |
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Definition
Lock the crane in a stationary position
Prevent an inadvertent roll back
(When ascending a grade) |
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Term
All steering functions performed on a grade must be done with the propel power directed in the uphill direction
T/F? |
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Definition
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Term
| What advantage does a hydrostatic drive propel system have over the mechanical drive system? |
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Definition
Hydraulic brakes
Individual hydrostatic drives for each track |
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Term
| How should tracks be maintained? |
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Definition
| Welding and hard surfacing |
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Term
| How should track tumblers be maintained? |
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Definition
Properly aligned to minimize wear
Bearing life is extended through lubrication |
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Term
| How should track rollers be maintained |
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Definition
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Term
Drive sprockets and chains are very independent of each other in that the condition of one does not affect the other
T/F |
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Definition
False
They are very much connected together |
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Term
Correct meshing of drive sprockets and chains is dependent on proper chain tension and sprocket:
Size?
Lubrication?
Alignment? |
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Definition
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Term
Sprocket shafts are a lubrication-critical item and must be lubricated accordingly
T/F? |
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Definition
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Term
| A roller path is to be kept clean and lubricated with a film of light oil while the ring gear requires proper lubrication using? |
|
Definition
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Term
What maintenance procedure must be followed for the lower bevel gear case and the
Intermediate shaft assembly unit? |
|
Definition
Maintain oil level,
Change according to specs
Drain water to maintain correct oil level
Gear oil level must be maintained |
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Term
The upper works of a crane consists of 3 main components,
What are they |
|
Definition
The house
Machinery deck
And main frame |
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Term
The operators control area is located in the
House
Machine deck
Main frame
Or carrier deck? |
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Definition
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Term
In many cases the upper works main frame combines the frame for the draw works, and supports the boom, gantry, mast, etc.
T/F? |
|
Definition
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|
Term
American hoist and Derrick company refers to the combined components as:
Machinery deck
Upper machinery
Upper superstructure? |
|
Definition
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|
Term
Link belt describes their upper works machinery as
Machinery deck
Upper machinery
Upper superstructure
Upper revolving frame? |
|
Definition
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|
Term
To enable the upper works to swing on the carrier, mobile cranes use one of the two main systems
Name them? |
|
Definition
Hook and house rollers
Bearing type roll path |
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Term
| Explain the function of a house roller |
|
Definition
| Supports the weight of the upper works |
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Term
| Explain the function of a hook roller |
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Definition
| Secures upper works to the car body |
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Term
The main purpose of the centre pin is to anchor the upper works to the roll path
T/F? |
|
Definition
False
The main purpose is to keep the upper works centred on the roller path |
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Term
| Name the 2 most common types of swing circles |
|
Definition
Ball bearing
&
Roller bearing |
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|
Term
The swing gear is always permanently fastened to the:
Carrier
Upper works
Swing pinion
Hook roller |
|
Definition
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|
Term
The majority of mobile cranes are powered by
Diesel
Natural gas
Gas
Electric |
|
Definition
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Term
| The mechanical clutch used to connect and disconnect the engine from the transmission or power train is referred to as |
|
Definition
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Term
| Explain the basic difference between a regular torque converter and a variable torque converter |
|
Definition
Torque converter- output is determined by engine speed
Variable changes torque by engine speed and amount of oil being impinged on the turbine wheel |
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Term
The most common way to connect the engine to the draw works is by means of a
Gear train
Drive chain
Torque converter |
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Definition
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Term
| In the gear train a small pinion gear is used to drive a larger bull gear this arrangement reduces the speed of rotation of the bull gear but increases the |
|
Definition
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Term
| Planetary gearing uses a combination of gears within a ------- to provide a gear reduction |
|
Definition
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Term
| Explain the purpose of a bevel gear |
|
Definition
| Used for driving swing, travel, and boom hoist systems |
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Term
The direction of rotation of the swing assembly depends on which
Direction the bevel side gear is turning
Bevel side gear is engaged
Or pinion gear is engaged |
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Definition
| Direction the bevel side gear is turning |
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Term
When the swing break is applied, the upper works is prevented from rotating on the carrier
T/F? |
|
Definition
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Term
| What is the purpose of the boom hoist assembly |
|
Definition
| Means of raising, holding, or lowering the boom |
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Term
| List the 4 systems or methods by which power to the boom hoist assembly is controlled in both the lowering and raising mode |
|
Definition
Bevel gear assembly
Planetary system
A boom sprang assembly |
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Term
The boom hoist clutches and the boom hoist break are arranged so that the boom hoist break is ------
When either clutch is applied and ------- when either clutch is released |
|
Definition
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Term
| List 3 main advantages of a deep reduction worm drive |
|
Definition
Input shaft turns at high speed but requires only moderate power
Clutch and reverse gear can be quite compact due to the moderate power requirements |
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Term
| List key sensors and Gauges that must be monitored when operating the crane upper works |
|
Definition
Engine oil pressure and temp
Hydraulic oil pressure, temp, and low level warning
Air pressure and low level warning
Coolant temp
Clutch limit buzzer |
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