Danfoss H1 Service Manual

Also see for H1 Series: Technical information Technical information Technical information Technical information Technical information

Contents

Standard procedures, removing the pumpBefore working on the pump, thoroughly clean the outside. If the pump has an auxiliary pump attached,remove both pumps as a single unit. Tag and cap all hydraulic lines as you disconnect them, and plug allopen ports to ensure that dirt and contamination do not get into the system.C CautionContamination can damage internal components and void the manufacturer's warranty. Takeprecautions to ensure system cleanliness when removing and installing system lines.Removal1. With the prime mover off, thoroughly clean all dirt and grime from the outside of the pump.2. Tag, disconnect, and cap each hydraulic line connected to the pump. As hydraulic lines aredisconnected, plug each open port, to ensure that dirt and contamination do not get into the pump.3. Remove the pump and its auxiliary pump (if applicable) as a single unit.Be careful, do not damage solenoids and electrical connections when using straps or chains tosupport the pump.Inspection1. Ensure the work surface and surrounding area are clean and free of contaminants such as dirt andgrime.2. Inspect the system for contamination.3. Look at the hydraulic fluid for signs of system contamination, oil discoloration, foam in the oil, sludge,or metal particles.Replacement1. Before replacing the pump, replace all filters and drain the hydraulic system. Flush the system linesand fill the reservoir with the correct, filtered hydraulic fluid.2. Fill the pump with clean, filtered hydraulic fluid.3. Attach the pump to the prime mover. Torque mounting screws according to the manufacturersrecommendation.4. Replace all hydraulic lines. Ensure the charge inlet line is filled with fluid.Electric control moduleRemovalRefer to the exploded diagram.1. Using a 5 mm internal hex wrench, remove the six cap screws (D250).2. Remove the control module and gasket (D150). Discard the gasket.3. If necessary, remove orifices (F100) using a 3 mm internal hex wrench. Tag and number them forreinstallation.InspectionInspect the machined surfaces on the control and top of the pump. If you find any nicks or scratches,replace the component.ReassemblyEnsure you install dowel pins (D300) in housing before installing control.Service ManualH1 45/53/60/68 Tandem Closed Circuit Axial Piston PumpsMinor repair© Danfoss | June 2018 520L0928 | AX00000103en-US0303 | 47