PowerBoss Nautilus Hi-Dump PB45HDSL, Service Booklet

Page: 49 / 117

49
ADJUSTMENTS & PROCEDURES
IMPELLER PRESSURE RELIEF ADJUSTMENT:
Install an appropriate pressure gauge at the gauge port on the impeller hydraulic manifold. The gauge port (GA) is located on the face of the
manifold when viewed from the front of the machine.
In order to force the hydraulic fluid through the relief valve it is necessary to block the flow from the manifold to the impeller.
•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.
•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.
•Start the machine and switch the engine throttle switch to operating (high) speed.
•Turn on the impeller.
•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.
•Reconnect the hydraulic hose to the impeller solenoid.
This completes the main brush pressure relief adjustment.
NAUTILUS MAIN BRUSH AND IMPELLER PRESSURE RELIEF ADJUSTMENTS