Danfoss 51 Series Service Manual
Also see for 51 Series: Service Kit InstructionsRepair instructionsService manualService manualService manual
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Contents
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OperationFunctional DescriptionJA control is a stand-alone, dual signal hydraulic proportional control. The control housing contains apressure compensating override (PCOR) valve, a brake pressure defeat (BPD) valve, and passages to routeoil to the 4-way valve and to the servo piston ends. An external servo supply pressure fed to port M5 isrequired. A threshold spring and ramp spring(s) act on the opposite end of the 4-way valve.Signal PressureSeparate external variable signal pressures are fed into ports XA or XB. The BPD spool resolves whichsignal pressure is higher and routes this signal pressure to the end of the 4-way valve. The signal pressureshifts the 4-way valve and it ports servo supply pressure to the ends of the servo piston, changing motordisplacement in proportion to the signal pressure.JA Control Schematic DiagramnT2 T3T7 T8T1T6T4 max.disp.BXB XA AL2 M4 M3 NM1L1M2(M5)X3P106 420EU7Loop flushPCORBPDRepairDisassembly1. Remove PCOR lock nut (M14).2. Remove and discard O-ring (M16).3. Remove adjuster ( Z*).4. Remove spring (M18).5. Remove spool assembly (M20).C CautionDo not remove PCOR valve bushing (M21).Service Manual Series 51 Hydraulic Proportional Controls Service ManualJA Control36 11009446 • Rev BA • July 2014 |
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