Table of Contents
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Service Manual
Contents
Introduction
Series 90 Pumps
Overview..............................................................................................................................................................................................5
Warranty.............................................................................................................................................................................................. 5
General instructions........................................................................................................................................................................ 5
Safety precautions............................................................................................................................................................................6
Unintended machine movement..........................................................................................................................................6
Flammable cleaning solvents................................................................................................................................................. 6
Fluid under pressure.................................................................................................................................................................. 6
Personal safety............................................................................................................................................................................. 6
Symbols used in Danfoss literature............................................................................................................................................7
Design...................................................................................................................................................................................................7
The system circuit.............................................................................................................................................................................8
The basic closed circuit............................................................................................................................................................. 8
Case drain and heat exchanger..............................................................................................................................................9
Charge pump...................................................................................................................................................................................11
Charge relief valve......................................................................................................................................................................... 11
Multi-function valves.................................................................................................................................................................... 11
Pressure limiter and high pressure relief valves................................................................................................................. 12
System check valves......................................................................................................................................................................12
Bypass valves................................................................................................................................................................................... 12
Speed sensors..................................................................................................................................................................................13
Filtration options............................................................................................................................................................................13
Pressure override (POR) - 180 frame size only.................................................................................................................... 13
Manual displacement control (MDC)......................................................................................................................................14
Non-Linear MDC............................................................................................................................................................................. 14
Solenoid override valve for MDC..............................................................................................................................................14
Neutral start switch (NSS)............................................................................................................................................................14
Hydraulic displacement control (HDC).................................................................................................................................. 14
Electric displacement control (EDC)........................................................................................................................................15
Automotive control (FBA II B).................................................................................................................................................... 15
3-Position (FNR) electric control............................................................................................................................................... 15
Overview........................................................................................................................................................................................... 16
Input speed...................................................................................................................................................................................... 16
System pressure............................................................................................................................................................................. 16
Charge pressure..............................................................................................................................................................................16
Charge inlet pressure....................................................................................................................................................................17
Case pressure...................................................................................................................................................................................17
Temperature and viscosity......................................................................................................................................................... 17
Fluid and filter recommendations........................................................................................................................................... 17
Overview........................................................................................................................................................................................... 19
Features and options....................................................................................................................................................................19
Operating parameters..................................................................................................................................................................19
Fluid specifications........................................................................................................................................................................19
General ..............................................................................................................................................................................................21
Start-up procedure........................................................................................................................................................................ 21
Required tools................................................................................................................................................................................. 22
Port locations and gauge installation.....................................................................................................................................22
Overview........................................................................................................................................................................................... 25
Neutral difficult or impossible to find.....................................................................................................................................25
System operating hot...................................................................................................................................................................25
520L0818 • Rev 0101 • August 2015
3
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