Table Of Contents - Danfoss DDC20 Service Manual

Axial piston pumps

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Service manual (30 pages)

Table Of Contents

Table of Contents

Service Manual

DDC20 Axial Piston Pumps

Contents

Introduction

Pressure Measurements

Danfoss | August 2017

Overview..............................................................................................................................................................................................4

Warranty.............................................................................................................................................................................................. 4

General Instructions........................................................................................................................................................................ 4

Remove the unit.......................................................................................................................................................................... 4

Keep it clean..................................................................................................................................................................................4

Lubricate moving parts.............................................................................................................................................................4

Replace all O-rings and gaskets............................................................................................................................................. 4

Secure the unit............................................................................................................................................................................. 5

Safety Precautions............................................................................................................................................................................5

Unintended machine movement..........................................................................................................................................5

Flammable cleaning solvents................................................................................................................................................. 5

Fluid under pressure.................................................................................................................................................................. 5

Personal safety............................................................................................................................................................................. 5

Symbols used in Danfoss literature............................................................................................................................................6

Gauge Port Locations and Gauge Installation - with Aux Pad......................................................................................... 7

Gauge Port Locations and Gauge Installation - with Geroter.......................................................................................... 8

Gauge Port Locations and Gauge Installation - with Implement Pump.......................................................................9

Pump Adjustment..........................................................................................................................................................................10

Standard Procedures.................................................................................................................................................................... 10

Charge Pressure Relief Valve......................................................................................................................................................10

High Pressure Relief Valve - HPRV............................................................................................................................................ 11

Loop Flushing Valve......................................................................................................................................................................12

Overview........................................................................................................................................................................................... 13

System operating hot...................................................................................................................................................................13

Transmission operates normally in one direction only.................................................................................................... 13

System noise or vibration........................................................................................................................................................... 13

System will not operate in either direction.......................................................................................................................... 14

Sluggish system response...........................................................................................................................................................14

Charge Pump...................................................................................................................................................................................15

Implement Pump........................................................................................................................................................................... 17

Shaft and Seal..................................................................................................................................................................................18

High Pressure Relief Valves - HPRV.......................................................................................................................................... 21

Charge Pressure Relief Valve......................................................................................................................................................22

Loop Flushing Valve......................................................................................................................................................................23

Bypass Valve.....................................................................................................................................................................................24

Optional Coupling......................................................................................................................................................................... 26

Fastener Size and Torque Chart - with Charge Pump.......................................................................................................27

Fastener Size and Torque Chart - with Implement Pump............................................................................................... 27

Plug Size and Torque Chart - with Gerotor...........................................................................................................................28

Plug Size and Torque Chart - with Aux Pad.......................................................................................................................... 29

Plug Size and Torque Chart - with Implement Pump....................................................................................................... 30

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