Danfoss 90 Series Service Manual

Also see for Series 90: Installation Technical information

Contents

Danfoss 90 Series Service Manual Manual pdf 21 page image

GeneralFollow this procedure when starting-up a new pump installation or when restarting an installation inwhich the pump was removed.W WarningUnintended movement of the machine or mechanism may cause injury to the technician or bystanders.To protect against unintended movement, secure the machine or disable/disconnect the mechanismwhile servicing.Prior to installing the pump, inspect for shipping damage.Start-up procedure1. Ensure that the hydraulic fluid and system components (reservoir, hoses, valves, fittings, and heatexchanger) are clean and free of contamination.2. Install new system filter element(s) if necessary. Check that inlet line fittings are properly tightenedand there are no air leaks.3. Install the pump. Install a 50 bar [1000 psi] gauge in the charge pressure gauge port M4. Fill the housing by adding filtered fluid in the upper case drain port. Open the case plug in the top ofthe control to assist with air bleed.5. Fill the reservoir with hydraulic fluid of the recommended type and viscosity. Use a 10-micron fillerfilter. Fill inlet line from reservoir to pump.6. Disconnect the pump control input signal.After start-up the fluid level in the reservoir may drop due to filling of the system components. Checkthe level in the reservoir to maintain a full fluid level throughout the start-up procedure.C CautionDamage to hydraulic components may occur from failure to maintain fluid supply.7. Use a common method to disable the engine to prevent the engine from starting. Crank the starterfor several seconds. Do not to exceed the engine manufacturer’s recommendation. Wait 30 secondsand then crank the engine a second time. This operation helps remove air from the system lines. Refillthe reservoir to recommended full fluid level.8. When charge pressure reaches 3.5 bar [50 psi], enable and start engine. Let the engine run for aminimum of 30 seconds at low idle to allow the air to work itself out of the system. Check for leaks atall line connections and listen for cavitation. Check for proper fluid level in reservoir.C CautionAir entrapment in fluid under high pressure may damage hydraulic components.Do not run at maximum pressure until system is free of air and fluid has been thoroughly filtered.9. When adequate charge pressure is established (as shown in model code), increase engine speed tonormal operating rpm to further purge residual air from the system.10. Shut off the engine. Connect the pump control signal. Start the engine, checking to be certain thepump remains in neutral. Run the engine at normal operating speed and carefully check for forwardand reverse control operation.11. Continue to cycle between forward and reverse for at least five minutes to bleed all air and flushsystem contaminants out of loop.Normal charge pressure fluctuation may occur during forward and reverse operation.12. Check that the reservoir is full. Remove charge pressure gauge. The pump is now ready for operation.Service Manual Series 90 PumpsInitial start-up procedure520L0818 • Rev 0101 • August 2015 21