Danfoss H1 Service Manual

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Contents

Torque sequence234561Control solenoidsRemoval1. Disconnect electrical connection and remove the three cap screws (D050) using a 4 mm internal hexwrench.2. Remove the solenoid (D025) and O-ring (D025A). Discard the O-ring.3. If necessary, remove the coil using a 12 point 26 mm socket.InspectionInspect the machined surface on the control. If you find any nicks or scratches, replace thecomponent.Reassembly1. Lubricate new O-ring (D025A) using petroleum jelly and install.2. Install solenoid with three cap screws (D050) using a 4 mm internal hex wrench. Torque screws to 5N•m [4 lbf•ft].3. Install coil using a 12 point 27 mm socket. Torque coil nut to 5 N•m [3.7 lbf•ft].4. Reconnect electrical connections and test the pump for proper operation.MDC ControlRemovalRefer to exploded diagram, below.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 servo orifices (F00A, F00B), supply orifice (F00P), and tank orifices (F00T) using a3 mm internal hex wrench. Tag and number them for reistallation.4. If screen (D084) is clogged, use a hook to remove the retaining ring (D098) and the screen. Discardthe screen and replace with a new screen.5. Before removing the control, note the position of the control lever for reassembly.C CautionDo not disassemble the control, otherwise the functionality of the control and the neutral position ofthe pump can be lost!Service ManualH1 45/53/60/68 Tandem Closed Circuit Axial Piston PumpsMinor repair© Danfoss | June 2018 520L0928 | AX00000103en-US0303 | 49