RO 2358

ACTUAL PHOTOS

2004 SCHWARZE A 4000
EXCELLENT CONDITION
NEW FAN
NEW LINER
AIR CONDITION
84,859 MILES
3,756 HOURS
CALL 1-800-222-3686

The Schwarze model A4000 street sweeper is a chassis-mounted, regenerative air sweeper with a 4.3 cubic yard capacity. The basic design of the A4000 street sweeper has had many years of successful operation throughout the United States and around the world. Because of its relatively compact size, the Schwarze A4000 street sweeper requires no Commercial Driver's License for operation and offers great maneuverability. With its sweeping power and environmentally-friendly regenerative air design, the A4000 is an ideal choice for use in a wide range of demanding road sweeping applications.

The A4000 sweeper's blower system generates a high velocity air column which is propelled into the top of its sweeping head through a 12-inch blast tube. The air is first pressurized in the upper chamber of the sweeping head, then expelled into the head's lower chamber through what is called a "blast orifice". This is a slot in the sweeping head that forces the air against the pavement at an angle, creating a "peeling" or "knifing" effect. The high volume air blast loosens the debris from the pavement surface, then transports it across the width of the sweeping head and lifts it into the containment hopper via a 12-inch suction tube. The blast and suction on the A4000 sweeper is generated by the Schwarze-exclusive WhisperWheelsm fan system.

This is a highly efficient system which ensures that even hard-to-reach particles hidden within pavement cracks and irregularities are removed, including the "PM-10 fines" known to contain a high percentage of heavy metals, phosphates and other pollutants. Double-belted curtains on the front and rear of the sweeping head contain the circulating air flow to assure debris transfer with minimal fugitive dust particles.
The Schwarze A4000 series regenerative air sweeper is mounted on a standard production truck chassis, providing the operator with convenience and comfort. Several options are available, including air conditioning and dual steering.

This air sweeper utilizes a ‘closed loop’ airflow system via a sweeping head to accomplish debris pickup. A portion of the system’s air may be vented-off to increase the sweeper’s vacuum power. The remaining air is recirculated, producing the blast force under the sweeping head.

The sweeper unit is powered by an auxiliary engine mounted on the sweeper frame to the rear of the truck cab. It is fueled from the truck’s main fuel tank. To provide power to the sweeper, the engine propels a fan by use of a drive belt connected to a bearing-mounted drive shaft. The balanced, abrasion-resistant, fan draws air from inside the hopper and forces it out of the fan housing. To protect the fan housing from excessive wear, all Schwarze sweepers are equipped with a replaceable rubber liner.

The fan forces air drawn from the hopper down the pressure hose, through an opening in the top of the sweeper head, and into the upper/rear pressure chamber. This air is then funneled across the front of the chamber, and out a slot, called the ‘blast orifice.’ As the air is pushed through the blast orifice, it is transformed into a high velocity stream that blasts forward and downward onto the sweeping surface in the sweeping head’s lower/front chamber.

The sheer force of this air loosens debris, picks it up, and pushes it across the lower/front chamber of the sweeping head in a spiraling motion and moves it towards the suction inlet on the vacuum side of the sweeping head. A series of flexible rubber flaps, called ‘curtains,’ are bolted on the front and back of the sweeping head. These curtains, along with the metal skid plates on each end, contain the high velocity air within the sweeping head. Due to the vacuum inside the hopper caused by the fan's draw of air, the debris is pulled up through the suction hose and into the hopper.

Once inside the hopper, a number of strategically placed water nozzles may be used to decrease the amount of airborne dust. As the dust comes into contact with the water spray, it becomes heavier. The dust and debris-laden air loses speed upon entering the large volume of the hopper, so heavier objects fall to the hopper bottom. The air is then drawn through a screen in the top of the hopper, which removes any remaining lighter objects. Only fine particles of dust remain to be pulled through the screen and into the dust separator in the front of the hopper. As air is pulled from the dust separator by the fan, it develops a spiraling action, and the resulting centrifugal force throws the remaining fine dust against the walls of the separator, returning it through slots to the hopper bottom. The fan then draws the cleaned air from the dust separator back into the fan housing and the cycle begins again.

For your convenience and safety, each Schwarze A4000 SERIES sweeper is controlled from a console in the truck cab. The console allows for remote operation of the hydraulic, dust suppression, and lighting systems, as well as the sweeper's auxiliary engine.