Danfoss 51 Series Service Manual

Also see for 51 Series: Service Kit Instructions Service manual Repair instructions Service manual Service manual

Danfoss 51 Series Service Manual Manual pdf 27 page image

ProcedureAlways follow this procedure when starting-up a new Series 51 or Series 51-1 installation or whenrestarting an installation in which either the pump or motor has been removed.W WarningThis service procedure may require disabling the vehicle / machine (raising the wheels off the ground,disconnecting work function, and so forth) while performing, to prevent injury to the technician andbystanders. Take the necessary safety precautions.1. Before installing the motor and/or pump, inspect the units for damage incurred during shipping andhandling.2. Make certain all system components (reservoir, hoses, valves, fittings, heat exchanger, and so forth)are clean before filling with fluid.3. Fill the reservoir with recommended hydraulic fluid. Filter using a 10 micron (nominal, no bypass)filter into the reservoir. Using contaminated fluid may damage components which may result inunexpected vehicle/machine movement.4. Fill the inlet line leading from the reservoir to the pump.5. Check inlet line for properly tightened fittings6. Make sure the inlet line is free of restrictions and air leaks.7. Fill the motor and/or pump housing with clean hydraulic fluid before start up. Fill by pouring filteredoil into the upper case drain port.C CautionNever start the prime mover unless the motor and pump are filled completely with clean hydraulicfluid.8. Install a 0-60 bar [0-1000 psi] pressure gauge in the charge pressure gauge port of the pump tomonitor the charge pressure during start-up.9. Disconnect any external control input signal (linkage for MDC, hydraulic lines for HDC, or electricalconnections for EDC) from the pump control until after initial start-up. This ensures that the pumpremains in its neutral position.10. Use a common method to disable the prime mover. Jog (slowly rotate) prime mover until chargepressure starts to rise.11. Enable prime mover. Start the prime mover and run at the lowest possible speed until chargepressure is established.W WarningDo not start the prime mover unless the pump is in neutral position (swash plate at 0° angle). Takenecessary precautions to prevent machine movement in case pump is actuated in stroke duringinitial start-up.If necessary, bleed excess air from the high pressure lines through the high pressure system gaugeport.12. Once charge pressure is established, increase speed to normal operating speed.Charge pressure should be as indicated in the pump model code. If charge pressure is low, shut downand determine cause. See: Troubleshooting on page 29.C CautionLow charge pressure may affect the operators ability to control the machine.13. Shut down the prime mover.14. Connect the external control input signal.Service ManualSeries 51 and 51-1 MotorsInitial startup procedures© Danfoss | March 2016 11008567 | AX00000013en-US0202 | 27