Bearcat BC-502/CRC, Instruction Manual

Page: 22 / 164

BC-502/CRC
22
Asphalt Plumbing
Asphalt Pump
The Asphalt Pump is a positive
displacement geared pump. The
standard pump has a delivery
capacity of 400 gallons per
minute (GPM), BC-450 (4” x 400
GPM). The intake and outlet
ports are of 4 inch (102 mm)
diameter. Optional pumps are
BC-300 (3” x 250 GPM), BC-600
(5” x 500 GPM), and the BC-960 (8” x 750 GPM). The direct coupling of
the asphalt pump to the shaft of the hydrostatic motor through a 3.5 to
1 gearbox results in a direct relationship between truck speed and
computer controlled pump output. If truck speed is increased, pump
output automatically increases to an appropriate amount to maintain
the correct flow of asphalt through the spray nozzles. The asphalt pump
operates in either direction, at any flow rate within its operating range,
as determined by either the CRC system or the manual pump controls.
See the ‘Cab Console Controls’ section of this manual for additional
information. The asphalt flow rates, or pump output, is displayed in
GPM on the digital CRC display in the cab of the truck.
Spread / Circulate Relief Valve
The asphalt distributor is
equipped with a
Spread/Circulate Relief Valve
that is
controlled in tandem with the spray
bar MASTER switch. The flow rate is
controlled by the CRC system, so
that the selected spread rate is
always maintained even
though the operator
increases or decreases the number of
Spread / Circulate Relief Valve