User manual CATERPILLAR AS2251 BROCHURE
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Manual abstract: user guide CATERPILLAR AS2251BROCHURE
Detailed instructions for use are in the User's Guide.
[. . . ] Nose bar and screed plate replacement are simplified with tapped holes and studs. Heavy-duty mounting platforms provide rigid support for screed plates, which simplifies leveling.
Screed Plate Leveling
Save time with the trailing edge screed plate leveling system.
Screed plate leveling is quick and convenient with the trailing edge adjusting system, which eliminates shims. The trailing edge adjusting system saves time when installing new screed plates or when adjusting existing plates. The trailing edge adjusting bolt system hardware is plated to provide extra corrosion resistance.
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Screed Controls
Conveniently positioned extender and main screed control boxes provide easy access to various screed functions.
Left side main screed and extender controls
Main screed control boxes are mounted on each side of the screed and contain: Extender in-out; Feeder gain; Burner ignition; Horn; and Feeders on-off. [. . . ] The Caterpillar electrical standards, developed to enhance reliability and durability, feature soldered, molded, numbered and color-coded wires. Electrical schematics detailing wire numbers, wire colors and component part numbers are located in the service manual.
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Extender Slope
Each extender can be sloped during operation from +10% to -3% or +76 mm to -25 mm. Indicators show the percent of slope.
Hydraulic System
The extenders and vibrator systems are hydraulically controlled with electricover-hydraulic components. Systems are equipped with test ports for easy access to sample pressures. All hydraulic connections have O-ring face seal (ORFS) fittings and couplings to provide maximum protection against hydraulic system leaks. High-pressure Cat XT hoses provide an extended service life.
Extender Configuration
Two hydraulically driven extenders infinitely vary screed width within the paving range. The front-mounted extenders are supported by two 51 mm (2") diameter extendible tubes that provide torsional resistance and rigidity. Extender width changes can be made from the tractor, main screed or remotemounted control boxes. The remotemounted control boxes are positioned at the end of each extender. Extenders are equipped with vibrators and heaters that are separate from the main screed. Frequency and amplitude are synchronized with main screed vibrators.
Crown
Crown adjustment is made with an easyto-operate hand crank, which is equipped with a positive-locking device. Optional power crown control can be added.
Electrical System Extender Height
Height adjustment allows each extender to match the mat thickness being placed by the main screed. Adjustments are made with easy-to-operate hand cranks, which are equipped with positivelocking devices. Indicators show the amount of adjustment in 6. 4 mm (0. 25") increments. Integrity of the electrical system on Cat machines is ensured with the use of high-quality components. The Caterpillar electrical standards, developed to enhance reliability and durability, feature soldered, molded, numbered and colorcoded wires with nylon-braided wrap to protect the electrical harness.
Vibrator System
The main screed and extenders are equipped with a vibrator system that provides initial compaction. Vibrator speed is adjustable from 0 to 50 Hz (3, 000 vpm).
Pre-Strikeoff Shields
A pair of patented pre-strikeoff shields are positioned at the front of the screed. The pre-strikeoff shields allow the proper amount of material to enter the area in front of the main screed, which influences the head of material in front of the main screed. The pre-strikeoff shields follow the leading edge of the main screed, when the thickness screws are used to adjust mat depth. These proportional changes occur because the shields are attached to the drop arms with mechanical linkages. If manual adjustment of the shields is desired, handles on the mechanical linkages allow the height to be fine tuned. Adjusting the handles only changes the height of the pre-strikeoff shields. [. . . ] Cat Dealers have training videotapes, literature and other ideas to help increase productivity. Consider the financing options available as well as day-to-day operating costs. This is also the time to look at dealer services that can be included in the cost of the machine to yield lower equipment owning and operating costs over the long run. More and more equipment buyers are planning for effective maintenance before buying equipment. [. . . ]
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