Sauer-DanfossSeries 51 Service Training 51系列变量马达服务培训Series 51 and 51-1 Bent Axis Variable Displacement Motors弯轴变量马达Series 51 Overview 纲要 Motor sizes and Definition Features of the Rotating Group Features of the End cap Controls Port location and Gauge installation Adjustment Minor repairSeries 51 to low viscosity of the oil from over heat or just to thin of oil, improper oil (poor lubricating qualities), or over speed. The piston movies so fast back and forth in its bore that it losses its oil film. The piston land wears down enough to allow the ring (at least of it) to come out of its groove and break. The pieces of the ring usually end up in the motor case or in the drain line. But not always, some pieces can go into the system loop and cause damage. Scored PistonScoring in the block bores is usually at the outer side of the bore. This is because centrifugal force is throwing the pistons out from center. If a piston or pistons are scored, the block bore will also be scored. The rough surface of the block bore is what scores the piston and removes enough material to let the ring come out of its groove. Scored block boresSynchronizing Shaft 同步轴 Large synchronizing shaft specify control ramp spring (module S) for proportionalX1Controls: Electric 2 Position (E1/E2)Controls: Electric 2 Position (F1/F2)Controls: Pressure compensating Pressure Compensator (PC) Function When pressure is below PC setting, no function When pressure reaches PC setting, control begins to move motor toward max. displacement Control adjusts the motor to whatever displacement is necessary to maintain the system pressure at the PC setting PCOR (Pressure Compensator Override) functions same as PC, except it is overriding some other “primary” control function (two position or proportional) Controls: Pressure compensating Brake Pressure Defeat (BPD) Function Many machines will decelerate too abruptly if controlled by a PC or PCOR type control, since motor goes to max. angle when braking BPD prevents the PC from acting during “dynamic braking”, only allows PC to function when system delta pressure is “positive” (as during acceleration) Results in a gradual, controlled deceleration Requires a hydraulic signal to tell the control which way the machine is travelingControls: Pressure Compensating Pressure compensator only Pressure compensator + electric or hydraulic override to max. displacement Pressure compensator pressure + brake pressure defeat Pressure compensator + BPD + electric or hydraulic override to max. displacementPressure compensating controls are available with:Pressure Compensating ControlsServo pressure supplyServo Pressure & PCOR Supply Options (Module N)C2 = Internal supply, PC available on ports A & B, No BPDControlsC2 and C4ControlsServo Pressure & PCOR Supply Options (Module N)C0 - Internal supply, PC available on ports A or B, (according to spool position), & Brake Pressure Defeat.(BPD shuttle requires two external hydraulic signal lines from a valve that is dependent on travel direction)C0 and C3ControlsServo Pressure Supply Options (Module N) (continued) R5 - Internal supply, Pressure compensator available on port A only. L5 - Internal supply, Pressure compensator available on port B only, X AX B”L5 and L6X AX B”R5 and R6C1 and C3Proportional Displacement ControlsEP / EQ HPHSH1 / H2 K1 / K2HZControls: Electrohydraulic Proportional (EP/EQ)Controls - Electro hydraulic Proportional (EP/EQ)Pressure Compensator Over-Ride options: (Module N) Overrides proportional displacement control using high system pressure stroking motor toward maximum displacement A2 - Standard version, PCOR on ports A & Bfunctions when motor is running in motoring (acceleration) & pumping (deceleration) modeControlsPCOR Below Set Point Press.PCOR Above Set Point Press.Pressure Compensator Override Servo supply options (Module N) A1 With PCOR & Brake Pressure Defeat.A shuttle spool ahead of the PCOR valve defeats PCOR operation during dynamic breaking. External signal pressure shifts the spool according to vehicle direction. R2 - PCOR on port A only. L2 - PCOR on port B only.ControlsControl Block(With PCOR&Defeat)Control Block(With PCOR&Defeat)Controls Pressure Compensator setting procedure Maximum DisplacementReduced DisplacementStroking to Max. Disp.Max. Disp.System Pressure (M5)Max. Disp. Servo Pressure (M4)Min. Disp. Servo Pressure (M3)PCOR Threshold SettingShiftOPERATOR CONTROLS DISPLACEMENTPCOR REGULATES DISPLACEMENTChargeCaseSystemP R E S S U R EControlsL1 / L2 / L7 - Electric Proportional Control direct acting solenoid design. 12 or 24VDCControlsD7 D8 - Automotive style motor control (Electrohydraulic Proportional, w/ PCOR & BPD)Series 51 Port locations 51马达油口位置Series 51 motors Side port 径向油口Series 51 Port locations 51马达油口位置Series 51 motors Axial port 轴向油口Series 51-1 Port locations 51-1马达油口位置Series 51-1 motors Side port 径向油口Series 51-1 Port locations 51-1马达油口位置Series 51-1 motors