90R100 Danfoss Variable Piston Pump 420Bar

Product Overview

Designed to fulfill the demanding requirements for high power density and extreme durability in closed-circuit hydrostatic transmissions, our industrial-grade 90R series axial piston variable pumps (covering 90R030, 90R042, 90R055, 90R100, 90R180, and 90R250) deliver uncompromising engineering performance. Engineered around a swashplate design for closed loops, these pumps and their complete replacement rotary groups (cylinder blocks, pistons, valve plates, drive shafts, charge pumps, and seal kits) serve as 100% drop-in replacements for original Danfoss / Sauer-Danfoss Series 90 units. Every assembled pump and rotary component undergoes 100% simulated working condition load testing before dispatch. This ensures exceptional volumetric efficiency and reliability at continuous operating pressures up to 420 bar, providing a strong, dependable powertrain for your heavy-duty machinery.

Technical Specifications

• Representative Model: 90R100 (Covering 90R030, 90R042, 90R055, 90R100, 90R180, 90R250)

• Pump Type: Axial Piston Variable Pump for Closed Circuits (Swashplate design with built-in charge pump)

• Displacement Range: 100 cc/rev (Series range: 30 cc/rev to 250 cc/rev)

• Rated Operating Pressure: 420 bar (6090 psi)

• Peak Operating Pressure: 480 bar (6960 psi)

• Maximum Speed: 3600 rpm (For size 90R100)

• Control Methods: EDC (Electrical Displacement Control), MDC (Manual), HD (Hydraulic)

• Rotation: Clockwise (CW) / Counter-Clockwise (CCW) available

• Spare Parts Support: Cylinder block, piston shoe assembly, valve plate, drive shaft, charge pump, seal kits

• Weight: Approx. 68 kg (For complete 90R100 pump)

Key Technical Advantages

• 100% Drop-in Interchangeability: Precision-engineered to exact OEM specifications. Mounting flanges, SAE splined drive shafts, main work ports, and charge ports match Danfoss Series 90 dimensions perfectly, allowing seamless complete unit replacement or component-level repairs.

• Heavy-Duty Bimetallic Rotary Group: Utilizes bimetallic steel-bronze cylinder blocks, precision-ground and hardened valve plates, and carbonitrided piston assemblies. The internal components easily withstand continuous 420-bar pressures and frequent directional reversals.

• Integrated Charge Pump & Protection Valves: Built-in high-efficiency gerotor/gear charge pump provides continuous cooling and replenishment oil to the closed loop. Integrated high-pressure relief valves and pressure limiters safeguard the system against extreme pressure spikes.

• 100% Simulated Working Condition Testing: Zero batch sampling tolerance. Every unit and replacement rotary kit undergoes stringent testing on automated test benches, verifying full-load volumetric efficiency, internal leakage limits, and control valve responsiveness prior to shipment.

Application Areas

Specifically built for closed-loop hydrostatic traction drives in heavy mobile equipment. Perfectly matched for transit concrete mixers, asphalt compaction rollers, track skid steer loaders, combine harvesters, forestry machines, snow groomers, and underground mining utility vehicles.

Expert Maintenance Tips

• Mandatory Pre-filling & Air Bleeding: Prior to initial startup or after rebuilding, fill the pump casing completely with clean hydraulic oil through the highest case drain port. Never dry-run the pump, as missing lubrication will destroy the slipper pads and valve plate within seconds.

• Monitor Charge Pressure Continuously: Charge pressure is vital for keeping closed-circuit pumps operational. Regularly check that the charge pressure remains within specification (typically 18 to 22 bar). A drop in charge pressure requires immediate shutdown to inspect charge filters or the charge pump.

• Maintain Strict Oil Cleanliness: Closed hydraulic circuits are highly vulnerable to particulate contamination. Maintain a fluid cleanliness level of ISO 4406 18/16/13 or better, and replace charge and main system return filters according to strict maintenance intervals.