Danfoss 90 Series Service Manual

Also see for Series 90: Installation Technical information

Contents

Danfoss 90 Series Service Manual Manual pdf 4 page image

Transmission operates normally in one direction only.................................................................................................... 25System will not operate in either direction.......................................................................................................................... 26Low motor output torque...........................................................................................................................................................26Improper motor output speed..................................................................................................................................................26System noise or vibration........................................................................................................................................................... 27System response is sluggish...................................................................................................................................................... 27AdjustmentsStandard procedures, inspections, and adjustments....................................................................................................... 28Adjustments.....................................................................................................................................................................................28Charge pressure relief valve adjustment...............................................................................................................................28Multi-function valve pressure adjustment............................................................................................................................30Engaging the bypass function.................................................................................................................................................. 31Pressure override (POR) valve pressure adjustment (option for 180 frame size)....................................................32Displacement limiter adjustment............................................................................................................................................ 33Standard manual displacement control (MDC) adjustment.......................................................................................... 33Non-linear manual displacement control (MDC)............................................................................................................... 34MDC Neutral start switch (NSS) adjustments.......................................................................................................................35Checking switch continuity........................................................................................................................................................38Hydraulic displacement control (HDC) and electric displacement control (EDC) adjustment..........................39Speed sensor adjustment........................................................................................................................................................... 40Minor repairStandard procedures.................................................................................................................................................................... 42Removing the pump................................................................................................................................................................42Shaft seal and shaft replacement.............................................................................................................................................42Multi-function valve cartridges.................................................................................................................................................44Multi-function valve cartridges - pre 1988............................................................................................................................46Pressure override valve (option for 180 frame size).......................................................................................................... 47Charge pressure relief valve.......................................................................................................................................................48Adding an Auxiliary pad to a pump previously without one.........................................................................................50Auxiliary pad.................................................................................................................................................................................... 51Charge pump...................................................................................................................................................................................52Integral charge pressure filter replacement.........................................................................................................................55Pump control cover plate........................................................................................................................................................... 56Displacement control orifices....................................................................................................................................................57Displacement control orifice check valve............................................................................................................................. 57Displacement control adapter plate (early production 130 pumps only).................................................................58Manual displacement control (MDC)......................................................................................................................................59Solenoid override valve for MDC..............................................................................................................................................60Solenoid override valve for MDC with pressure released brake................................................................................... 61Hydraulic and electric displacement controls..................................................................................................................... 62Pressure control pilot (PCP) for electric displacement control (EDC)..........................................................................633-Position (FNR) electric control............................................................................................................................................... 63Displacement control filter screens.........................................................................................................................................65Speed sensor................................................................................................................................................................................... 66Torque chartFastener size and torque chart..................................................................................................................................................68Plug size and torque chart..........................................................................................................................................................69Fasteners and plugs...................................................................................................................................................................... 70Service Manual Series 90 PumpsContents4 520L0818 • Rev 0101 • August 2015