Danfoss Series 45 Service Manual

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Danfoss Series 45 Service Manual Manual pdf 22 page image

PC controlPC setting is indicated in the pump model code. Refer to the Series 45 Open Circuit Axial Piston PumpsTechnical Information Manual, BLN-10128, for more information.Before performing adjustments, read Pressure measurement, for recommendations.1. Install a pressure gauge in port M2 to measure system pressure. Install a pressure gauge in case drainport L1 or L2 to measure case pressure.W WarningUnintended movement of the machine or mechanism may cause injury to the technician orbystanders. To protect against unintended movement, secure the machine or disable / disconnectthe mechanism while servicing.C CautionContamination can damage internal components and void the manufacturer’s warranty. Takeprecautions to ensure system cleanliness when removing and reinstalling system lines.2. Start the prime mover and allow fluid to reach normal operating temperature. Operate a hydraulicfunction to its full extension, loading the pump at maximum pressure and zero flow.3. Loosen the PC set screw and turn the PC adjustment screw until the desired setting is indicated onthe pressure gauge at port M21. Clockwise rotation will increase pressure, counterclockwise rotationwill decrease; approximate gain = 35 bar [507 psi] per turn.If the pressure does not increase, an external system relief valve may require adjustment. Externalsystem relief valve must be set above the PC setting for proper operation.4. While holding the position of the PC adjustment screw, torque the PC set screw to 9 N•m [7 lbf•ft].5. Stop the prime mover, remove the pressure gauges, and return the system to its normal operatingconfiguration.PC control adjustment: Adjustment screw, set screw, and gauge locations shownM2P101652L1PC adjustment screwPC set screwItem Description Gauge Port size Wrench size TorqueM2 Gauge port 300 bar [5000 psi] 9/16-18 1/4 inch internal hex 51 N•m [38 lbf•ft]M14 4 mm internal hex 31 N•m [23 lbf•ft]1 PC setting is referenced to case pressure. Subtract case pressure from system pressure to compute the actual setting.Service ManualSeries 45 Frame K and L Open Circuit Axial Piston PumpsAdjustments22 | © Danfoss | August 2016 520L0532 | AX00000040en-US0401