BC-502/CRC
Hydraulics
Pump Drive Options
Hydraulic power is used to drive the asphalt pump and move the spray
bar. Primary power for the hydraulic system is derived from a power
takeoff driven by the truck engine. Either a transmission PTO,
Crankshaft, REPTO, or an additional engine may be employed.
Transmission Power Take-Off
The transmission power take-off (PTO) consists of a gearbox mounted to
the truck transmission, from which a driveline connects to a hydrostatic
pump. The PTO gearbox operates only when the truck clutch is engaged
on manual transmission trucks. When the clutch is disengaged, the PTO
stops, in turn stopping the hydrostatic motor. Automatic transmission
generally have a live PTO that constantly operates once the PTO is
engaged. The transmission PTO is
engaged by use of a switch on the
Cab Console. In general, the PTO
can be switched on when the
truck arrives at the job site and
left on continuously until the shift
is finished for the day. All
configurations of the PTO can be
operated at highway speed. See your truck Operations Manual for
details on the PTO operation for your specific truck.
Crankshaft or REPTO Drive
The crankshaft and rear engine PTO (REPTO) are driven directly by the
truck crankshaft, allowing the hydrostatic pump and asphalt pump to be
operated independently of the truck clutch. Crankshaft or REPTO drives
are typically used in applications where the truck transmission is not
equipped with an adequate PTO, the end user prefers a live PTO with a
manual transmission and in applications where truck body can be
changed out on the truck, such as a swap loader.