PowerBoss Nautilus Hi-Dump PB45HDSL, Service Booklet

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If the part number on the side of the reduction valve body in port 4.2 (not the coil but the cartridge
body) ends with the number 45 then it is already set at 450 psi. If this valve has already been adjusted
go to “Setting the side scrub brush floor pressure controller”.
To adjust the reduction valve in the SSB manifold at port 4.2:
1. Install a tee fitting with a gauge port between the hydraulic hose and the SSB hydraulic manifold
at port SBLB.
2. Attach a suitable hydraulic pressure gauge to the gauge port in the tee fitting.
3. Zero the pressure gauge if necessary.
4. Loosen the lock nut on the adjustment stud on the reduction valve located on the SSB hydraulic
manifold at port 4.2
5. Insure that the green “One-Touch” switch is in the off position.
6. Start the engine
7. Set the throttle switch to high.
8. Turn the reduction valve adjustment stud clockwise until the pressure gauge reads 450 psi.
9. Tighten the reduction valve locknut.
10. Verify the pressure reading.
11. Turn off the engine.
12. Replace the hydraulic hose at port SBLB.
Setting the side scrub brush floor pressure (Using the dual proportional valve driver)
The dual floor brush pressure controller or dual proportional valve driver (located on the left front face
of the operator console) provides three separate side brush floor pressure forces by controlling the
hydraulic pressure output of the proportional reduction valve located on the SSB hydraulic manifold at
port 6.2. This variable output pressure is applied to the piston-end of the side scrub head lift cylinder.
This variable pressure is balanced against the steady 450 psi on the rod-end of the cylinder (provided by
the reduction valve in port 4.2) to achieve the desired side scrub brush floor pressure.
The controller has a left control knob, a right control knob, and an information screen.
The right control knob scrolls between the various parameters.
The left control knob provides input settings.