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90 Series Variable Pumps And Motors Repair Manual (BLN-9949 REV E).pdf

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Axial Piston Pumps and Motors Repair Manual Series 90 Axial Piston Pumps and Motors Series 90 General Description Series 90 Variable Displacement Pumps are cradle swashplate design units, incorporating parallel axial pistons with slippers. These pumps are designed to be combined with other products in closed circuit systems to transfer and control hydraulic power. The pump output flow rate is proportional to the pump's input speed and is determined by the swash- plate angle, whic
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  Axial PistonPumps and MotorsRepair ManualSeries 90  Axial Piston Pumps and MotorsSeries 90 General Description Series 90 Variable Displacement Pumps are cradleswashplate design units, incorporating parallel axialpistons with slippers.These pumps are designed to be combined withother products in closed circuit systems to transferand control hydraulic power.The pump output flow rate is proportional to thepump's input speed and is determined by the swash-plate angle, which may be infinitely varied betweenzero and maximum displacement.The pump's flow direction is reversed by tilting theswashplate to the opposite side of the zero displace-ment position.A compact, responsive, closed loop servo system,with a choice of manual, hydraulic, or electrical input,controls the swashplate angle. An automotive drivecontrol is also available.Series 90 Fixed and Variable Displacement Motorsare swashplate design units, incorporating parallelaxial pistons with slippers.These motors are primarily designed to be combinedwith other products in closed circuit systems to trans-fer and control hydraulic power.The output speed is proportional to the flow rate of thehydraulic fluid through the motor (and the motordisplacement, for variable motors). Output torque isproportional to the difference in the pressure levels inthe high and low sides of the fluid circuit.The motor's direction of rotation depends on thedirection of fluid flow through the motor.Variable Displacement Motors are available with 2-position electric solenoid or hydraluic displacementcontrol, and utilize internally supplied servo pres-sure. Variable motors normally start at maximumdisplacement. Activation of the motor control resultsin the motor shifting to minimum displacement. Copyright 1987, 1991, 1992, Sauer- Danfoss  CompanyAll rights reserved. Contents subject to change. Printed in U.S.A. 0792 H  The Series 90 — Advanced Technology Today  The Most Technically Advanced Hydraulic Units in the Industry  8 Sizes of Variable Displacement Pumps  6 Sizes of Fixed Displacement Motors  Complete Family of Control Systems  Proven Reliability and Performance  Optimum Product Configurations  Compact, Lightweight  0 -1 Axial Piston Pumps and MotorsSeries 90 Contents Introduction.................................................................................................................................................0 - 2Safety Precautions....................................................................................................................................20 - 1Tool Information........................................................................................................................................20 - 2Exploded View of the Variable Displacement Pump.................................................................................40 - 1Exploded View of the Fixed Displacement Motor....................................................................................40 - 13Exploded View of the Variable Displacement Motor...............................................................................40 - 17Major Repair - Variable Pump...................................................................................................................61 - 1General..............................................................................................................................................61 - 1Disassembly Procedures for Variable Displacement Pump...............................................................61 - 2Reconditioning and Replacement of Parts.........................................................................................61 - 6Assembly Procedures for Variable Displacement Pump.................................................................61 - 12Major Repair - Fixed Motor.......................................................................................................................62 - 1General..............................................................................................................................................62 - 1Disassembly Procedures for Fixed Displacement Motor...................................................................62 - 2Reconditioning and Replacement of Parts.........................................................................................62 - 4Assembly Procedures for Fixed Displacement Motor........................................................................62 - 6Major Repair - Variable Motor...................................................................................................................63 - 1General..............................................................................................................................................63 - 1  0 - 2 Axial Piston Pumps and MotorsSeries 90 Introduction This manual provides “Major Repair” procedures forthe Series 90 variable displacement pumps and fixedand variable displacement motors. Minor Repairs  are those repairs which can beperformed without removing the end cap or sidecover. These repairs can be performed by anycustomer without affecting the unit warranty. Theserepairs are described in the “Series 90 — ServiceManual,” Bulletin BLN-9947. Major Repairs  are those repairs which require theremoval of the end cap or side cover. These repairsare to be performed only by Sauer- Danfoss  Au-thorized Service Centers and/or srcinal equipmentmanufacturers who have been adequately trained by Sauer-Danfoss to perform these repairs. Per-forming major repairs on the Series 90 products mayaffect the unit warranty status, thus the factory shouldbe consulted prior to undertaking such repairs.These repair procedures, when used in conjunctionwith the Series 90 Service manual, Bulletin BLN-9947, provide complete service and repair informa-tion for the Series 90 products.For Technical Information on Series 90 pumps andmotors, refer to BLN-10029 and BLN-10030.For Fluid Quality Requirements, refer to bulletin BLN-9887, or Publication SDF (Id. No. 697581). Sauer-Danfoss provides a complete repair serv-ice for its products. Contact any Sauer-Danfoss Authorized Service Center for details. Sauer-Danfoss Authorized Service Center locations are listedin BLN-2-40527, or Publication SAW (Id. No. 698266). Series 90 Variable Displacement PumpSeries 90 Fixed Displacement Motor 90000015 90000016

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