PowerBoss Nautilus Hi-Dump PB45HDSL, Service Booklet, Page: 90 / 117

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When energized this solenoid allows a maximum of 450 psi fluid flow (from reducing valve RV4) into and
out from the rod-end of the side brush lift cylinder.
This valve directs the flow to and from the piston-end of the side brush lift cylinder through port SBLB.
SOLENOID VALVE SV12 (Side brush Extend-retract) in port 5.2 is a 2-position 3-way directional control
valve.
When de-energized this valve directs fluid from the piston-end of the side brush extend cylinder through
port SBEA to tank through port T1 (side brush retracted).
When energized it directs pressurized fluid to the piston-end of the squeegee lift cylinder through port
SBEA (side brush extended).
Note: The rod end of the side brush extend cylinder always has line pressure from port SBEB. With
equal pressure on both sides of the piston the cylinder operates using the difference in area between
the piston with the rod and the piston without the rod.
CMK 10-10-2014