MAIN SCREED COMPONENTS.
The main screed provides the structural rigidity for the
main screed plate and is attached to the tractor by two
screed tow arms. The main screed plate, bolted to the
bottom of the main screed, rides on top of the paving
mat and creates a smooth finish. A strike plate controls
the amount of paving material that reaches the main and
extension screed plates. The weight and vibration of the
main screed provides the initial compaction for the mat.
The crown adjustment control is mounted in the center of
the main screed and can be adjusted to create the
desired contour of the finished paving material.
Two hydraulic cylinders are mounted inside the main
screed and extend and retract the extension screeds to
and from their maximum width of 14 ft. A full length,
telescopic, nonskid step is attached to the main and
extension screeds, and adjusts with the travel of the
extension screeds. On the outside end of each
extension screed, an endgate is attached to prevent the
outward movement of paving material beyond the
material mat being laid. The endgates also provide a
finished edge to the mat.
The 8 foot to 14 foot (2,4 to 4,3 m) hydraulic extendable
screed is equipped with four hydraulically driven
eccentric vibrators and four individually controlled diesel
fuel burners with remote electrical ignition. The burners
preheat the screed plate to prevent paving material from
sticking to the screed as it is applied to the surface being
The bolt on screed extensions provide an additional 2
feet of paving width. The cutoff plates are used to
reduce the paving width to four feet.
The main screed components are identified and located,