PowerBoss Nautilus Hi-Dump PB45HDSL, Service Booklet

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1. Remove the hydraulic hose from the outlet of the hydraulic manifold at port VF OUT located on
the top of the manifold and plug (pressure tight) the fitting on the manifold and the end of the
hose.
2. Loosen the lock nut and unscrew the pressure adjustment screw on the pressure relief valve
RV1 located in port 9.2. This will allow all of the fluid flow to pass at low pressure through the
relief valve.
3. Start the machine and switch the engine throttle switch to operating (high) speed.
4. Turn on the impeller.
5. Turn the pressure relief adjustment screw in (clockwise) while monitoring the hydraulic pressure
on the pressure gauge.
When the gauge reads 2500 psi (it will vary a little, you will probably not get it to read exactly 2500 and
that is OK) tighten the adjustment screw lock nut and turn off the engine.
NOTE: Perform the adjustment as quickly as possible. During this set up do not run the machine for an
extended period of time after the pressure relief is set as the hydraulic oil will generate excessive heat
when going through the pressure relief valve.
6. Reconnect the hydraulic hose to the impeller solenoid.
This completes the main brush pressure relief adjustment.
11-13-2013 CMK