Toro ProCore Processor Service Manual page 39

Raise and Lower Circuits
NOTE: On machines equipped with the Tow Hitch Kit,
the remote control handle switch needs to be in the lift
position in order for the raise and lower circuits to oper-
ate.
Raise (Fig. 11)
When the tow vehicle control is positioned to raise the
ProCore Processor, oil flows from the tow vehicle hy-
draulic system, to the ProCore Processor lift relief man-
ifold port A, through the CB cartridge check valve, out
manifold port C1 and then to the barrel end of the Proc-
essor lift cylinder. Hydraulic pressure against the lift cyl-
inder piston extends the cylinder. As the lift cylinder
extends, the lift axle rotates the Processor wheels to the
ground and causes the ProCore Processor to raise. Oil
displaced from the extending lift cylinder returns through
the lift relief manifold (ports C2 and B) to the tow vehicle
hydraulic system.
Maximum circuit pressure as the ProCore Processor is
raised is limited to 1100 PSI (76 Bar) by the raise relief
valve (RV1) in the lift relief manifold.
Lower (Fig. 11)
When the tow vehicle control is positioned to lower the
ProCore Processor, oil flows from the tow vehicle hy-
draulic system, through the ProCore Processor lift relief
manifold (port B and C2) and to the rod end of the Proc-
essor lift cylinder. Circuit pressure through the manifold
causes cartridge valve CB to shift which provides an oil
return path from the lift cylinder. Hydraulic pressure
against the lift cylinder piston retracts the cylinder. As
the lift cylinder retracts, the lift axle rotates the Processor
wheels away from the ground and causes the ProCore
Processor to lower onto the roller. Oil displaced from the
retracting lift cylinder returns to the tow vehicle hydraulic
system through manifold port C1, shifted valve CB and
manifold port A.
Maximum circuit pressure as the ProCore Processor is
lowered is limited to 1100 PSI (76 Bar) by the lower relief
valve (RV2) in the lift relief manifold.
ProCore Processor
UP
1
2
1. Lift relief manifold
2. Raise relief valve (RV1)
Page 4 - - 11
3
Figure 12
3. Lower relief valve (RV2)
Hydraulic System