Table Of Contents - Danfoss 51 Series Service Manual

Service Manual
Contents
Introduction
Pressure measurements
Adjustments
PCOR
Multifunction block
HZ, HA, HB, HE Controls
HS Control
Series 51 Hydraulic Proportional Controls Service Manual
Safety Precautions............................................................................................................................................................................5
Unintended Machine Movement..........................................................................................................................................5
Flammable Cleaning Solvents................................................................................................................................................5
Fluid Under Pressure..................................................................................................................................................................5
Personal Safety.............................................................................................................................................................................5
Hazardous Material.....................................................................................................................................................................5
Symbols used in Danfoss literature............................................................................................................................................6
Overview..............................................................................................................................................................................................6
General Instructions........................................................................................................................................................................ 7
Keep it Clean................................................................................................................................................................................. 7
Inspect for System Contamination....................................................................................................................................... 7
Replace the O-rings and Gaskets...........................................................................................................................................7
Lubricate all Moving Parts........................................................................................................................................................7
Torque Procedure....................................................................................................................................................................... 7
General Description.........................................................................................................................................................................7
Overview........................................................................................................................................................................................ 7
Threshold and Ramp Springs..................................................................................................................................................7
Multiblock...................................................................................................................................................................................... 8
Pressure Compensator OverRide (PCOR) Function........................................................................................................ 8
Brake Pressure Defeat (BPD) Option.................................................................................................................................... 9
Port locations and Gauge Installation.................................................................................................................................... 10
Threshold Setting...........................................................................................................................................................................11
Checking Threshold Setting................................................................................................................................................. 11
Adjusting Threshold Setting.................................................................................................................................................11
Pressure Compensator OverRide (PCOR) Setting...............................................................................................................12
PCOR Adjustment.....................................................................................................................................................................12
Checking PCOR Setting on a Test Stand.......................................................................................................................... 13
Adjusting the PCOR Setting..................................................................................................................................................13
Optional PCOR Housing...............................................................................................................................................................14
Disassembly................................................................................................................................................................................14
Inspection....................................................................................................................................................................................14
Assembly......................................................................................................................................................................................14
Optional Multifunction block ................................................................................................................................................... 16
Disassembly................................................................................................................................................................................16
Inspection....................................................................................................................................................................................17
Assembly......................................................................................................................................................................................17
Operation..........................................................................................................................................................................................18
Functional Description........................................................................................................................................................... 18
HZ Control................................................................................................................................................................................... 18
HA and HB Controls................................................................................................................................................................. 18
HE Control................................................................................................................................................................................... 18
Repair..................................................................................................................................................................................................19
Disassembly................................................................................................................................................................................19
Inspection....................................................................................................................................................................................20
Assembly......................................................................................................................................................................................20
Operation..........................................................................................................................................................................................21
Functional Description........................................................................................................................................................... 21
Repair..................................................................................................................................................................................................21
Disassembly................................................................................................................................................................................21
11009446 • Rev BA • July 2014 3