Sauer Danfoss 20 Series Service Manual
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Sauer Danfoss 20 Series Service Manual

Axial piston motors
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Series 20
Axial Piston Motors
Service Manual and
Repair Instructions

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Summary of Contents for Sauer Danfoss 20 Series

  • Page 1 Series 20 Axial Piston Motors Service Manual and Repair Instructions...

  • Page 2: Contents Introduction And Description

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Introduction, Description INTRODUCTION The purpose of this manual is to provide you with the information necessary for the normal maintenance and servicing of the Sauer-Danfoss hydrostatic series 20 units. This includes a description of the units and their components as well as troubleshooting, pressure setting and repair procedures.

  • Page 3: Table Of Contents

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Contents CONTENTS Introduction and description ........................... 2 Model Code ..................................4 Recommended tools and installation ........................5 List of tools necessary for minor repairs and maintenance of units of all sizes ........5 Additional tools list for complete stripping of units ..................

  • Page 4: Model Code

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Model Code TYPE DESIGNATION AND ORDER CODE S M F Producer mark Series of product producer specifi- motor fixed cation according association to construction type 20 (at present = A1) Displacement cm Units with working mark 33.3 [2.03]...

  • Page 5: Recommended Tools And Installation

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Recommended Tools and Installation LIST OF TOOLS 1 Circlip pliers ∅ 2 to 2.5 mm NECESSARY FOR MINOR 1 Screw driver 3 mm REPAIRS AND 1 Screw driver 6 mm MAINTENANCE OF UNITS 1 Screw driver 9 mm OF ALL SIZES...

  • Page 6: Trouble Shooting, Gauge Installation And Information

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Recommended Tools and Installation TROUBLE SHOOTING, GAUGE INSTALLATION AND INFORMATION P000 341 Gauge Information 60 bar [870 psi] - Gauge Charge Pressure 7/16 - 20 UNF O-ring Fitting 600 [8700 psi] bar - Gauge System Pressure 7/16 - 20 UNF O-ring Fitting Vacuum gauge...

  • Page 7: Start-Up Procedure

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Start-up procedure PRECONDITIONS FOR Cleanliness: Ensure that the pipes, pipe connections and hoses as well as all other TROUBLE-FREE components are completely clean. OPERATION Ventilation and venting of the oil reservoir via an air filter. Operating fluid: HLP fluid according to DIN 51524, ATF type A SUFFIX A, HD-SAE motor oils, see Fluid Manufacturers,Technical Information.

  • Page 8: First-Time Operation

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Start-up procedure PRECONDITIONS FOR The charge pressure measured at the charge pressure gauge connection port of the TROUBLE-FREE pump with the adjusting lever in the neutral position should be approx. 15 bar [217.6 psi] OPERATION (continued) at a pump input speed n = 1500 min (rpm).

  • Page 9: Plumbing Installation (Variable Displac. Pump - Fixed Displac. Motor)

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Start-up procedure PLUMBING INSTALLA- TION (VARIABLE DISPLACEMENT PUMP - FIXED DISPLACEMENT MOTOR) P000 341 SYSTEM CIRCUIT DESCRIPTION HEAT EXCHANGER BYPASS VALVE RESERVOIR VACUUM GAUGE CONTROL HANDLE HEAT EXCHANGER SERVO CONTROL CYLINDER REVERSIBLE VARIABLE DISPLACEMENT PUMP FIXED...

  • Page 10: System Maintenance

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions System Maintenance INLET FILTER (BETWEEN The filter element must be exchanged as soon as the pressure drops below 0.75 bar FLUID RESERVOIR AND [10.9 psi] absolute (-0.25 bar [-3.6 psi]) when the transmission is at normal operating CHARGE PUMP) temperature.The filter must also be exchanged each time the pressure fluid is changed.

  • Page 11: Trouble Shooting

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Trouble Shooting TRANSMISSION Insert charge check valves Inspect high pressure Check control OPERATES IN ONE (see Series 20 Axial Piston relief valve linkage DIRECTION ONLY Pumps, Service Manual (see page 13) and Repair Instruction) Defective Defective...

  • Page 12: System Operating Hot

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Trouble Shooting SYSTEM OPERATING HOT Check fluid Inspect motor Check system Inspect heat Inspect level in by-pass valve pressure exchanger inlet filter reservoir (if used) (see page 13) to Low Defective Clogged Defective...

  • Page 13: Inspection Instructions

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Trouble Shooting INSPECTION Checking the high pressure relief valve High pressure relief valve INSTRUCTIONS When the problem occurs in one direc- tion only, interchange the relief valve cartridges to see if the problem changes to the other direction.

  • Page 14: Checking The Shuttle Valve

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Trouble Shooting INSPECTION Checking the shuttle valve INSTRUCTIONS Washer Shuttle spool The shuttle spool must be easily movable (continued) in the bore. Any wear, dirt or cracks, indicate that the complete valve block needs to be replaced, the spool and manifold are matched and cannot be replaced separa-...

  • Page 15: Disassembly And Assembly

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly SECTIONAL VIEW Axial piston fixed displacement motor High pressure relief valves Cylinder block (adjustable) assembly Shaft seal Purge relief valve Output shaft Valve block Shuttle valve Swashplate P005 118E DKMH.PS.330.C1.02 520L0534...

  • Page 16: Exploded View

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly EXPLODED VIEW P005 117 Description of parts: 1 Hexagonal screw 19 Retainer spring 39 Plug-pipe 2 Washer 20 Spring guide 71 O-ring 3 Kit manifold valve 21 Spring 75 O-ring 4 O-ring...

  • Page 17: Minor Repairs

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly MINOR REPAIRS Changing the shaft seal (disassembly) Utilize the lifting gear and mounting block in accordance with the fitting instructions on page 14. Clamp seal puller on seal-stationary F000 071 F000 070...

  • Page 18: Changing The Shaft Seal Assembly

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly MINOR REPAIRS Changing the shaft seal (assembly) (continued) 71 Bronze ring Slide the bronze sealing ring over the shaft and onto the shaft pilot diameter with the O-ring facing the unit. Work the ring into place using hand force only.

  • Page 19: Changing The Valve Manifold Assembly

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly MINOR REPAIRS Changing the valve manifold assembly (continued) Torque spanner F000 125 F000 126 The valve manifold assembly can be Remove the six (6) hex. cap screws and removed from the motor and replaced lift the manifold off the motor end cap.

  • Page 20: Repair The Manifold Valve Assembly

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Repair the manifold valve assembly DKMH.PS.330.C1.02 520L0534...
  • Page 21 Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly MINOR REPAIRS Hex-plug with shims To repair the charge relief valve, remove (continued) the hex-plug, spring and valve cone. Spring Valve cone Remove the shims from the counter bore of the hex-plug.

  • Page 22: Major Repairs

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly MAJOR REPAIRS Changing the valve and bearing plate (disassembly) The end cap crews should not be loosened until the shaft seal has been removed CAUTION! (see page 17). Remove the valve manifold assembly as outlined under minor repair Major repairs may affect procedures (see page 19).

  • Page 23: Changing The Valve And Bearing Plate Assembly

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly MAJOR REPAIRS Changing the valve and bearing plate (assembly) (continued) F000 135 F000 134 Install the pilot ring and the locating pin Renewing the valve- and bearing plates. in the cylinder block.

  • Page 24: Changing The Cylinder Block Kit, The Swash Plate And The Motor Shaft Disassembly

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly MAJOR REPAIRS 9 7 Torque spanner (continued) F000 138 F000 139 Place the end cap gasket on the housing, being certain the locating pins are in place, then install the end cap and valve Install two (2) end cap screws and alter- plate.
  • Page 25 Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly MAJOR REPAIRS 25 28 (continued) F000 142 Place the motor in a horizontal position. F000 143 Slide the cylinder block assembly off the shaft while holding the external end of Depending upon the extent of damage, the shaft.

  • Page 26: Changing The Cylinder Block Kit, The Swash Plate And The Motor Shaft Assembly

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Disassembly and Assembly MAJOR REPAIRS Changing the cylinder block kit, the swash plate and the motor shaft (assembly) (continued) Cone bearing 30 F000 146 Lubricate the swash plate, slippers, F000 147 pistons and bores with clean oil.

  • Page 27: Installation Torque Values

    Series 20 – Axial Piston Motors Service Manual and Repair Instructions Installation Torque Values Installation torque values Nm [lbf•in], series 20 Frame size Valve manifold assembly 21.7 [192] - 28.5 [252] 21.7 [192] - 28.5 [252] 21.7 [192] - 28.5 [252] 21.7 [192] - 28.5 [252] End cap 36.6 [324] - 50.2 [444]...
  • Page 28 OUR PRODUCTS Sauer-Danfoss Hydraulic Power Systems – Market Leaders Worldwide Hydrostatic transmissions Sauer-Danfoss is a comprehensive supplier providing complete Hydraulic power steering systems to the global mobile market. Electro-hydraulic power steering Sauer-Danfoss serves markets such as agriculture, construction, road building, material handling, municipal, forestry, turf care, and many Electric power steering others.

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