System operating hot...................................................................................................................................................................26
Transmission operates normally in one direction only....................................................................................................26
System will not operate in either direction.......................................................................................................................... 27
Low motor output torque...........................................................................................................................................................27
Improper motor output speed..................................................................................................................................................27
System noise or vibration........................................................................................................................................................... 28
System response is sluggish...................................................................................................................................................... 28
Adjustments
Standard procedures, inspections, and adjustments....................................................................................................... 29
Adjustments.....................................................................................................................................................................................29
Charge pressure relief valve adjustment...............................................................................................................................29
Multi-function valve pressure adjustment............................................................................................................................31
Engaging the bypass function.................................................................................................................................................. 32
Displacement limiter adjustment............................................................................................................................................ 33
Control Neutral Adjustment.......................................................................................................................................................34
Verify neutral setting...............................................................................................................................................................35
Servo Adjustment Side M4....................................................................................................................................................35
Standard manual displacement control (MDC) adjustment..........................................................................................36
MDC Neutral start switch (NSS) adjustments.......................................................................................................................36
Checking switch continuity........................................................................................................................................................40
Hydraulic displacement control (HDC) and electric displacement control (EDC) adjustment..........................41
Speed sensor adjustment........................................................................................................................................................... 42
Minor repair
Standard procedures....................................................................................................................................................................43
Shaft seal and shaft replacement.............................................................................................................................................43
Multi-function valve cartridges.................................................................................................................................................46
Charge pressure relief valve.......................................................................................................................................................48
Adding an Auxiliary pad to a pump previously without one.........................................................................................50
Auxiliary pad....................................................................................................................................................................................51
Charge pump...................................................................................................................................................................................52
Integral charge pressure filter replacement.........................................................................................................................55
Pump control cover plate........................................................................................................................................................... 57
Displacement control orifices....................................................................................................................................................57
Displacement control orifice check valve............................................................................................................................. 58
Manual displacement control (MDC)......................................................................................................................................58
Solenoid override valve for MDC..............................................................................................................................................60
Solenoid override valve for MDC with pressure released brake...................................................................................60
Hydraulic and electric displacement controls.....................................................................................................................61
3-Position (FNR) electric control...............................................................................................................................................62
Displacement control filter screens.........................................................................................................................................64
Speed sensor................................................................................................................................................................................... 64
Control Module Repair.................................................................................................................................................................65
Replace control solenoids/actuator housing.......................................................................................................................67
Torque chart
Fastener size and torque chart..................................................................................................................................................68
Plug size and torque chart..........................................................................................................................................................68
Fasteners and plugs......................................................................................................................................................................69
Service Manual
Series T90 Axial Piston Pumps
Contents
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Danfoss | March 2020 AX216086485386en-000101
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