Table Of Contents - Danfoss PVG 100 Service Manual

Service Manual
Contents
Introduction
Operation
System Troubleshooting
PVG 100 Component Troubleshooting
PVG 100 Proportional Valves
Overview..............................................................................................................................................................................................5
General Instructions........................................................................................................................................................................ 5
Remove the unit.......................................................................................................................................................................... 5
Keep it clean..................................................................................................................................................................................5
Replace all O-rings and gaskets............................................................................................................................................. 5
Secure the unit............................................................................................................................................................................. 5
Safety Precautions............................................................................................................................................................................6
Unintended machine movement..........................................................................................................................................6
Flammable cleaning solvents................................................................................................................................................. 6
Fluid under pressure.................................................................................................................................................................. 6
Personal safety............................................................................................................................................................................. 6
Hazardous material.................................................................................................................................................................... 6
Acronyms ............................................................................................................................................................................................7
PVG 100 Group with Open Center PVPF.................................................................................................................................. 8
PVG 100 Group with Closed Center PVPV............................................................................................................................... 8
PVG 100 Sectional Drawing.......................................................................................................................................................... 9
PVPC Plug for External Pilot Oil Supply..................................................................................................................................10
PVPC with Check Valve for Open Center PVP.................................................................................................................10
PVPC without Check Valve for Open Center PVP..........................................................................................................10
Friction detent.................................................................................................................................................................................11
PVMR Friction Detent..............................................................................................................................................................11
PVMF Mechanical Float Position Lock...............................................................................................................................11
PVBS, Main Spools for Flow Control (standard) ................................................................................................................. 12
PVBS, Main Spools for Flow Control (with linear characteristics) ................................................................................ 12
PVPP Electrical Pilot Shut-Off Valve.........................................................................................................................................12
PVPE Electrical Full Flow Unloading Valve............................................................................................................................13
Overview........................................................................................................................................................................................... 14
Troubleshooting a PVG Valve.................................................................................................................................................... 14
No Cylinder/Motor Response in Either Direction when Remote Controller is Actuated..................................... 16
Cylinder/Motor Responds in One Direction Only...............................................................................................................16
Main Valve Spool Moves without Oil Passing to Cylinder/Motor.................................................................................17
Cylinder/Motor Operates without Remote Controller being Operated.................................................................... 17
Cylinder/Motor Responds Slowly to Remote Electrical or Hydraulic Controller.....................................................18
Erratic Cylinder/Motor Response to Electrical or Hydraulic Controller Operation.................................................18
Hydraulic Oil Supply......................................................................................................................................................................18
Electrical Supply............................................................................................................................................................................. 19
Hydraulic (remote) Pilot Control Pressure............................................................................................................................ 20
Open Center Pressure Relief Valve...........................................................................................................................................21
Closed Center Pressure Relief Valve........................................................................................................................................ 21
Pressure Reducing Pilot Valve................................................................................................................................................... 21
Pressure Gauge Connection.......................................................................................................................................................23
Pressure Matching Spool.............................................................................................................................................................24
LS Connection................................................................................................................................................................................. 24
LS Signal............................................................................................................................................................................................ 25
Shuttle Valve....................................................................................................................................................................................26
Main Spool........................................................................................................................................................................................27
Shock and Anti-Cavitation Valve PVLP...................................................................................................................................29
Pressure Compensator.................................................................................................................................................................30
Maximum Oil Flow Adjustment Screws for Ports A and B...............................................................................................31
PVM Module.....................................................................................................................................................................................32
PVT/PVTI Module............................................................................................................................................................................33
PVAS Module................................................................................................................................................................................... 34
PVPP Pilot Shut Off Valve............................................................................................................................................................ 35
PVPE Unloading Valve ................................................................................................................................................................. 35
11048807 • Rev BA • October 2014 3