Table Of Contents - Danfoss 20 Series Service Manual

Axial piston pumps

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Service manual and repair instructions (28 pages)

Table Of Contents

Table of Contents

Service Manual and

Repair Instructions

Contents

Model Code

Recommended Tools and

Disassembly and Assembly

Axial Piston Pumps Series 20

Model Code ................................................................................................................................................................................. 4

Tools for Minor Repairs and Unit Maintenance ............................................................................................................. 5

Additional Tools for Complete Stripping of Units ......................................................................................................... 5

Measurement Instruments .................................................................................................................................................... 5

Trouble Shooting, Gauge Installation and Information .............................................................................................. 6

Preconditions for Trouble-free Operation ....................................................................................................................... 7

First-time Operation................................................................................................................................................................. 8

Plumbing Installa tion (Variable Displacement Pump - Fixed Displacement Motor) ..................................... 10

System circuit Description ................................................................................................................................................... 10

Inlet Filter .................................................................................................................................................................................. 11

Changing the oil ...................................................................................................................................................................... 11

Leak Test ..................................................................................................................................................................................... 11

Cleanliness ................................................................................................................................................................................. 11

Checking the oil level ............................................................................................................................................................ 11

Recommended oils................................................................................................................................................................. 11

Transmission Operates in one Direction Only .............................................................................................................. 12

System response is sluggish ............................................................................................................................................... 12

Neutral Difficult or Impossible to Find ............................................................................................................................ 13

System will not Operate in either Direction .................................................................................................................. 13

Inspection Instructions ........................................................................................................................................................ 14

Checking the servo valve (control valve) ................................................................................................................. 15

Sectional View .......................................................................................................................................................................... 16

Axial piston variable displacement pump ............................................................................................................... 16

Exploded View ......................................................................................................................................................................... 17

Minor repairs ............................................................................................................................................................................. 18

Mounting block ................................................................................................................................................................. 18

Changing the shaft seal (disassembly)...................................................................................................................... 19

Changing the shaft seal (assembly) ........................................................................................................................... 20

Changing the charge pump and the charge check valves ................................................................................ 21

Changing the servo valve (control valve) .................................................................................................................23

Major repairs ............................................................................................................................................................................. 24

Changing the valve- and bearing plate (disassembly) ....................................................................................... 24

Changing the valve- and bearing plate (assembly) .............................................................................................25

Changing the cylinder block kit (disassembly) ...................................................................................................... 27

Changing the cylinder block kit (assembly) ............................................................................................................28

Changing the swash plate and servo piston (disassembly) .............................................................................. 29

Changing the swash plate and servo piston (assembly) .................................................................................... 31

Changing the pump shaft ............................................................................................................................................. 33

Installation Torque Values .................................................................................................................................................... 35

L1003506 • Rev BA • Jun 2014