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Pro Sweep Hydraulic SystemPage 3 -- 15
Sweeper Offset Circuits
NOTE: Hydraulic flow and relief pressure to the Pro
Sweep are determined by the tow vehicle.
When the tow vehicle hydraulics are engaged for the
sweeper, hydraulic flow from the tow vehicle goes to the
sweeper control manifold (port P) through the hydraulic
inlet hose. If the sweeper brush motor is not engaged
(sweeper is raised above the transport height) and the
lift and offset cylinders are stationary, hydraulic flow
from the tow vehicle is directed by the control manifold
pressure compensator valve EC and the de--energized
solenoid valve SRV to return to the tow vehicle through
control manifold port T and the return to tank hose (Fig.
12).
Offset Right
When the remote transmitter offset right button is
pressed and held, the lower coil for solenoid valve SV1
in the hydraulic control manifold will be energized. If the
tow vehicle hydraulics are engaged for the sweeper, the
shifted SV1 allows a path for oil flow to the barrel end of
the offset cylinder.
Oil flow through shifted SV1 is directed through the
check valve in counterbalance valve CB2, out of control
manifold port R and to the barrel end of the offset cylin-
der. As circuit pressure increases, a manifold sensing
line shifts counterbalance cartridge CB1 to allow a re-
turn path for oil from the rod end of the offset cylinder.
The offset cylinder will extend to cause the sweeper to
offset to the right. Oil from the rod end of the offset cylin-
der returns to the tow vehicle through shifted SV1, con-
trol manifold port T and the return to tank hose.
Orifice OR1 (0.050) in thecontrol manifold exists to con-
trol the extending speed of the offset cylinder.
As the sweeper is being offset, relief valve RV functions
as a circuit relief valve. If circuit pressure reaches 2000
PSI (138 bar), RV will shift to reduce circuit pressure.
When the transmitter offset right button is released, the
lower coil for solenoid valve SV1 will de--energize and
oil flow to the offset cylinder will cease. The sweeper will
remain in position.
Offset Left
When the remote transmitteroffset left buttonispressed
and held,the upper coil for solenoid valve SV1 in the hy-
draulic control manifold will be energized. If the tow ve-
hicle hydraulics are engaged for the sweeper, the
shifted SV1 allows a path for oil flow to the rod end of the
offset cylinder.
Oil flow through shifted SV1 is directed through the
check valve in counterbalance valve CB1, out of control
manifold port L and to the rod end of the offset cylinder.
As circuit pressure increases, a manifold sensing line
shifts counterbalance cartridge CB2 to allow a return
path for oil from the barrel end of the offset cylinder. The
offset cylinder will retract to cause the sweeper to offset
to the left. Oil from the barrel end of the offset cylinder
returns to the tow vehicle through shifted SV1, control
manifold port T and the return to tank hose.
Control manifold orifice OR1 (0.050) and relief valve RV
function the same in offset left as during offset right.
When the transmitter offset left button is released, the
upper coil for solenoid valve SV1 will de--energize and
oil flow to the offset cylinder will cease. The sweeper will
remain in position.
Figure 12
CONTROL
MANIFOLD
LIFT
CYLINDER
OFFSET
CYLINDER
(DE--ENERGIZED)
Hydraulic
System