Highland Axial Piston Hydrostatic Transmission Pump HPV90-VD-23 90cc 35MPa with

Product Specification

Highland Variable Displacement Axial Piston Pump — Hydrostatic Transmission for Combine Harvesters

The Highland HPV90-VD-23 is a variable displacement axial piston pump engineered specifically for combine harvester hydrostatic transmission systems. With 90 cc/rev displacement and 35 MPa (350 bar) rated pressure, it delivers smooth, stepless speed control and reliable power transfer in demanding agricultural environments.

Product Details

• Variable Displacement Technology: Swashplate design enables continuous flow adjustment from zero to maximum, eliminating the need for clutching or gear shifting during harvesting operations.
• Hydrostatic Transmission Ready: Closed-loop circuit configuration with integrated charge pump provision, optimized for combine harvester propel and header drive systems.
• Stepless Speed Control: Hydraulic pilot or electro-proportional control delivers precise, jerk-free operation across the full speed range for optimal harvesting efficiency.
• High Efficiency: Precision-machined port plate and hardened sliding surfaces minimize internal leakage, achieving industry-leading volumetric efficiency and low heat generation.
• Agricultural-Grade Construction: Heavy-duty tapered roller bearings and hardened piston shoes ensure reliable performance under continuous high-load harvesting conditions.

Technical Specifications

HPV Series Hydraulic Pumps Technical Parameter

Applications

The HPV90-VD-23 is purpose-built for combine harvester hydrostatic propel systems, providing the variable speed control essential for efficient crop harvesting. It is also well-suited for forage harvesters, self-propelled sprayers, sugarcane harvesters, and other agricultural self-propelled equipment requiring reliable variable displacement hydraulic transmission.

Important Notes

• Fluid Quality: Use only clean mineral oil conforming to ISO VG 46. Maintain filtration at NAS 1638 Class 9 or better to ensure long pump service life.
• Startup Procedure: Fill the pump case with clean hydraulic oil before initial startup. Run at low speed for 5-10 minutes to ensure proper lubrication of all internal components.
• Temperature Monitoring: Maintain oil tank temperature below 70°C during continuous operation. Install an oil cooler if operating in high ambient temperatures.
• Regular Maintenance: Replace hydraulic filters every 500 operating hours or 3 months. Inspect shaft seals and case drain flow annually for signs of wear.
• Storage: When storing for extended periods, fill the pump with clean oil and seal all ports. Rotate the shaft monthly to prevent corrosion on internal surfaces.
• Installation: Ensure proper alignment between pump shaft and engine PTO. Misalignment exceeding 0.2mm will cause premature bearing failure.

Frequently Asked Questions

Q1: How do I select the correct control option for my harvester?
A: Hydraulic pilot control is recommended for standard mechanical linkage systems. Electro-proportional control is ideal for harvesters with electronic control units or joystick-operated systems. Contact our technical team for application-specific guidance.

Q2: What is the expected service life of the HPV90-VD-23?
A: With proper fluid maintenance and filtration, the HPV90-VD-23 is designed for 8000-10000 operating hours before major overhaul. Regular filter changes and oil analysis significantly extend service life.

Q3: Can this pump be used with biodegradable hydraulic fluids?
A: Yes, the HPV90-VD-23 is compatible with HETG and HEES type biodegradable fluids. However, operating temperature limits must be observed as these fluids may have lower thermal stability.

Q4: What warranty does Highland provide?
A: The HPV90-VD-23 comes with a 12-month warranty from the date of shipment, covering manufacturing defects. Extended warranty options are available for OEM customers.

For technical datasheets, OEM partnership inquiries, or volume pricing, please contact our export team today.