Danfoss T90R100 Axial Piston Pump | T90R100L T90R100M Closed Circuit Pump Replacement

Genlu Hydraulic proudly introduces our heavy-duty hydrostatic transmission core T90R100 Series (100cc full variable displacement framework) high-performance closed-circuit axial piston variable pumps. This series is fully engineered as a seamless, high-value, drop-in replacement for the classic Danfoss (Sauer-Danfoss) 90 series 100cc matrix, aligning precisely with intricate elektro-hydraulic proportional controls (EDC) and mechanical displacement controls (MDC) such as T90R100LWDNN, T90R100LW1NN80F 3D7F03MJX383820, and T90R100MADNN8AS 3DCF03MIX424220. Acting as the premium power plant for closed HST grids, the pump incorporates an integrated charge pump, bi-directional cross-over high-pressure relief valves, and systemic loop bypass valving. Genlu guarantees 100% Drop-in Interchangeability across standard SAE mounting interfaces, splined drive shafts, high-pressure A/B main side ports centerlines, and control current/resistance mapping parameters compared to original Danfoss units. Every 100cc assembly undergoes a comprehensive 100% closed-circuit simulation load test to certify elite stability under continuous high-frequency directional reversals.

Technical Specifications 

• Product Series: Danfoss 90 Series Closed Circuit Axial Piston Variable Pump (100cc Frame Size)

• Key Model Configurations: T90R100LWDNN, T90R100LW1NN80F, T90R100MADNN8AS

• Maximum Geometric Displacement: 100 cc/rev

• Nominal Circuit Operating Pressure: 42 MPa (420 bar)

• Peak Transient Circuit Pressure: 48 MPa (480 bar)

• Max Permissible Rated Speed: 3300 rpm (under continuous optimized charge pressure conditions)

• Max Theoretical Fluid Flow: Approx. 330 L/min (at maximum 3300 rpm threshold)

• Control Mechanisms:

  • MDC Platform (Mechanical Displacement Control via manual/linkage feedback valves, e.g., MADNN)

  • EDC Platform (Electrical Displacement Control via proportional current solenoids, e.g., WDNN/W1NN)

• Through-Drive Auxiliary Coupling: Code 80F / 8AS (Standard SAE rear adapter for tandem mounting secondary pumps)

• Direction of Rotation: L (Counter-Clockwise / Left Hand, looking from the drive shaft front face)

Key Technical Advantages:

• High-Flexibility EDC/MDC Proportional Servo Control Manifolds: The pilot spools inside the variable manifolds undergo nano-grade mirror polishing, and the magnetic coil assemblies feature premium thermal stabilization. This establishes an incredibly tight linear ratio between input control current and swashplate travel. Backed by dual high-pressure differential servo cylinders, the shifting response times stay below 60 ms with zero drift under continuous chassis vibrations.

• Monoblock Rigid Cast Iron Housing Architecture: Operating at 420 bar closed-circuit pressure induces immense internal tensile axial loads on the case framework. Genlu implements high-density nodular iron treated via artificial thermal aging. The main bearing journals and valving end-faces are milled in a single setup, drastically improving linear expansion resistance and checking micro-deflections or dynamic oil weeping under full traction loads.

• 9-Piston Flat Valve Plate Rotating Assembly: Utilizing an optimized asymmetric 9-piston orientation, each piston ball-head and slipper shoe boundary is consolidated via high-pressure hydraulic bonding and premium hard-coat overlay. This ensures a flawless hydrostatic boundary oil film between the shoes and swashplate face, minimizing shifting dead bands and dampening circuit frequency noise profiles.

• Integrated Multi-Functional High-Pressure Cross-Over Relief Block: The rear manifold houses a compact, integrated valve nest combining overpressure relief limits with check-boost capabilities. It handles microsecond-fast fluid dumping during explosive loop pressure spikes, securing a smooth fluid pressure gradient throughout the closed HST loop.

Application Areas:

• Heavy Duty Infrastructure & Road Machinery: Dual-side independent undercarriage hydrostatic track drives for high-capacity asphalt concrete pavers, primary heavy rollers drive grids, and closed-circuit milling planners propulsion systems.

• Concrete Transport & Material Mixing Networks: Direct drum hydraulic rotation loops for 12 to 16 cubic meters transit mixers (typically coupled alongside 90M series high-pressure motors).

• Agricultural Harvest & Industrial Utility Fleets: Primary hydrostatic wheel travel drives for large combine harvesters, underground explosion-proof utility tow tractors, and multi-wheeled material handling heavy flatbed platforms.

Expert Maintenance Tips:

• Enforce Strict Charge Boost Pressure Monitoring (Critical Pre-Start Protocol): The absolute lifeline of any closed-circuit system is adequate boost charge pressure. Upon cranking the engine at idle, check the dedicated test port to confirm that the charge pressure registers steadily between 2.0 and 2.4 MPa. Low charge pressure prevents the internal servos from shifting the swashplate (resulting in zero tracking power) and forces immediate cavitation of the main 100cc rotating block.

• Execute Mandatory Case and Servo Valve Bleeding: Following a pump installation and filling the casing entirely via the highest drain port, loosen the small venting plugs located on both sides of the servo cylinders. Idle the engine until fresh, bubble-free fluid runs cleanly from the threads before locking them back down. Neglecting this trap leaves a compressible air pocket inside the servo chambers, triggering sudden vehicle “surging” or erratic tracking.

• Enforce Premium Inline Filtering and Thermal Boundaries: Because fluid recirculates continuously between the pump and motor in a closed loop, abrasive wear particulates are not trapped by a simple open reservoir settling area. They will rapidly chew up both components. Deploy high-capacity filters rated at $\le 10\mu m$, keeping fluid profile indexes cleanly above ISO 18/16/13 while auditing system settings to ensure continuous loop oil temperatures do not spike past $85^\circ\text{C}$.