Hydraulic System144Service Manual – Advance 7765 / Nilfisk CR1500Checking Nominal Pressure ReadingsNote: There are two #8 Flat Face O-ring Fittingson the Auxiliary Pump that can be used tocheck the pressure from both sides of theAuxiliary Pump. Checking the hydraulicpressures at other locations will requireyou to assemble the appropriate fittingsthat will allow you to connect yourpressure gauge at that location.1. Install the appropriate fittings between the hydraulichose and the cylinder or motor that will allow you toconnect the pressure gauge.2. Run the engine in the high throttle position and allowthe hydraulic oil to warm up.• The bypass pressure is the pressure reading withno motor or cylinder operating.• The operational pressure is the pressure range in which the motor or cylinders will operate.• A much lower than normal bypass pressure could indicate a gear pump problem.• If the bypass pressure remains the same after turning the function on, there could be a problem inthe control valve or circuit.• If the operational pressure is within range but the motor speed is too slow, the problem could be inthe motor.• Check individual system Troubleshooting sections in this manual for additional information.#8 Flat FaceO-ring FittingAuxiliaryPump
