Danfoss T90 Series - User Manual

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Service Manual

Series T90 Axial Piston Pumps

www.danfoss.com

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Table of Contents3
Overview5
Warranty5
General Instructions5
Remove the Unit5
Replace All O-Rings and Gaskets5
Safety Precautions6
Unintended Machine Movement6
Flammable Cleaning Solvents6
Fluid under Pressure6
Personal Safety6
Symbols Used in Danfoss Literature7
Design7
The System Circuit9
The Basic Closed Circuit9
Case Drain and Heat Exchanger9
Operation12
T90 Charge Pump Operation12
T90 Charge Relief Valve Operation12
T90 Multi-Function Valve Operation12
T90 Pressure Limiter/High Pressure Relief Valve Operation13
T90 System Check Valve Operation13
T90 Bypass Valves Operation13
T90 Speed Sensor Operation14
T90 Filtration Options14
T90 MDC Operation14
T90 MDC Solenoid Override Valve Operation15
Neutral Start Switch (NSS) for MDC15
T90 HDC Operation15
T90 3-Position (FNR) Electric Control Operation15
High Current Electrical Displacement Control (HCEDC)15
HCEDC Principle15
HCEDC Operation16
Manual Override (MOR)16
Operating Parameters18
T90 Input Speed18
T90 System Pressure18
T90 Charge Pressure18
T90 Charge Inlet Pressure19
Case Pressure19
Temperature and Viscosity19
Fluid and Filter Recommendations19
Technical Specifications21
Overview21
Features and Options21
Operating Parameters21
Fluid Specifications21
Initial Start-Up Procedure23
General23
Start-Up Procedure23
Pressure Measurement24
Required Tools24
Port Locations and Gauge Installation24
Troubleshooting26
Overview26
Neutral Difficult or Impossible to Find26
System Operating Hot26
Transmission Operates Normally in One Direction Only26
System will Not Operate in Either Direction27
Low Motor Output Torque27
Improper Motor Output Speed27
System Noise or Vibration28
System Response Is Sluggish28
Adjustments29
Standard Procedures, Inspections, and Adjustments29
Charge Pressure Relief Valve Adjustment29
Multi-Function Valve Pressure Adjustment31
Engaging the Bypass Function32
Displacement Limiter Adjustment33
Control Neutral Adjustment34
Verify Neutral Setting35
Servo Adjustment Side M435
Standard Manual Displacement Control (MDC) Adjustment36
MDC Neutral Start Switch (NSS) Adjustments36
Checking Switch Continuity40
Hydraulic Displacement Control (HDC) and Electric Displacement Control (EDC) Adjustment41
Speed Sensor Adjustment42
Minor Repair43
Standard Procedures43
Shaft Seal and Shaft Replacement43
Multi-Function Valve Cartridges46
Charge Pressure Relief Valve48
Adding an Auxiliary Pad to a Pump Previously Without One50
Auxiliary Pad51
Charge Pump52
Integral Charge Pressure Filter Replacement55
Pump Control Cover Plate57
Displacement Control Orifices57
Displacement Control Orifice Check Valve58
Manual Displacement Control (MDC)58
Solenoid Override Valve for MDC60
Solenoid Override Valve for MDC with Pressure Released Brake60
Hydraulic and Electric Displacement Controls61
3-Position (FNR) Electric Control62
Displacement Control Filter Screens64
Speed Sensor64
Control Module Repair65
Replace Control Solenoids/Actuator Housing67
Torque Chart68
Fastener Size and Torque Chart68
Plug Size and Torque Chart68
Fasteners and Plugs69

Brand	Danfoss
Model	T90 Series
Category	Water Pump
Language	English

Danfoss T90 Series - User Manual

Table of Contents

Danfoss T90 Series Specifications

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