1-1. Purpose. To provide User and Support personnel supplemental maintenance and repair parts instructions that
have special application for the Paving Machine - Model BSF-400.
1-2. Scope. This publication applies to Department of the Army Units, Organizations and Activities that use and/or
support the Paving Machine, Bituminous Material, Crawler - Mounted.
1-3. Description. The Paving Machine, Bituminous Material, Crawler Mounted is designed to lay a uniform high density
mat of asphalt material, on highways, roadways, airport runways, parking lots, and driveways. It is capable of performing
jobs having strict control specifications and high production requirements.
The paver will level and compact asphalt material up to 10 inches in depth with mat widths varying from 6 to 20 feet.
Mat depth and width are accomplished by adjustment of feed controls and by arrangement and adjustment of the
finishing and compacting device called the "screed."
1-4. Operational Concept. The uniformly mixed hot asphalt material is dumped by truck onto the hopper of the paver
at a rate suitable for spreading. The paver contacts the rear wheels of the truck and pushes the vehicle ahead as the
paving progresses. The hot material is metered by two separate slat conveyors to the two spreading screws at the rear
of the tractor and ahead of the screed where the feed of material may be manually or automatically regulated for proper
distribution. The screed rides up on the asphalt to the degree set on the adjustable controls and varies the thickness and
contour of the mat deposited beneath it. The screed unit is equipped with electric vibrators which assist in the initial
compaction and smoothing of the high density mat. Final compaction is accomplished by separate rolling equipment.
Numerous cut-off and leveling attachments meet the need for varying width and contour requirements.
The screed is equipped with an oil fired heater which is operated prior to paving, in order to bring the screed temperature
up to the temperature of the asphalt so that no sticking or dragging will occur.
Raising and lowering of the full floating screed for paving or travel is done hydraulically by toggle switch control.
1-5. Procurement Status. The procurement contract number is IDA 700-77- C-8481 and was awarded on 15 August
1977. Additional Pavers were procured under Contract Number DAAE07-79-C-5795, dtd 29 Jun 79.