45M-185-11C-20 Vickers Eaton Vane Motor 193cc 172bar

Product Overview

The 26M, 35M, 45M and 50M series (including 26M-65A-1C20, 35M95A-11C20 and 45M-185-11C-20) are Eaton Vickers high-pressure, high-speed vane motors. Featuring a hydraulically balanced cartridge design that fully cancels radial forces, these motors deliver smooth torque, high volumetric efficiency, low noise and long life, with bi-rotational capability. We specialize in the R&D and manufacturing of high-pressure pumps, motors and valve blocks. Our products offer 100% drop-in interchangeability with genuine Vickers/Eaton units and undergo 100% simulated operating-condition testing. Precision machining and high-quality materials ensure stable torque output under high-pressure and high-speed conditions for construction machinery, marine winches and industrial drive systems.

Technical Specifications 

(Based on official Eaton Vickers engineering data; theoretical values excluding efficiency and tolerances)

• Series: 25M/26M, 35M/36M, 45M/46M, 50M/51M (26M etc. are heavy-duty bearing versions)
• Typical models:
  • 26M-65A-1C20: Torque rating 65 lb.in/100 psi, displacement approx. 68.7 cm³/r
  • 35M95A-11C20: Torque rating 95 lb.in/100 psi, displacement approx. 100.3 cm³/r
  • 45M-185-11C-20: Torque rating 185 lb.in/100 psi, displacement 193.2 cm³/r (11.79 in³/r)
• Continuous pressure: up to 172 bar (2500 psi)
• Peak pressure: Higher intermittent values possible depending on duty
• Maximum speed: Up to 3000–4000 r/min at low pressure; approx. 2200–3000 r/min at high pressure
• Control: Fixed displacement, hydraulically balanced, bi-rotational (reversed by changing inlet flow direction)
• Mounting & ports: SAE flange, shaft 1 = keyed, 11 = splined; port positions A/B/C/D available
• Approximate weight: 18 kg for 26M; 29 kg for 35M; 39 kg for 45M; 73 kg for 50M
• Other: Design 20 and subsequent compatible designs

Key Technical Advantages

1. Hydraulically balanced cartridge design: Symmetrical internal chambers fully balance radial forces, minimizing bearing loads, wear and heat for extended service life.
2. High volumetric efficiency and smooth torque: Dual pressure-plate construction reduces internal leakage, delivering smooth torque output with efficiency exceeding 90%.
3. High-pressure high-speed capability: Supports up to 172 bar and high rotational speeds, suitable for mobile and industrial drives.
4. 100% drop-in interchangeability and simulated-condition testing: Overall dimensions, mounting interfaces, shaft types and performance curves match genuine Vickers/Eaton units exactly for direct replacement. Every unit undergoes 100% simulated operating-condition testing to verify torque, speed, efficiency and sealing performance.
5. Bi-rotational operation and easy maintenance: Direction is reversed simply by changing inlet flow; cartridge design allows quick replacement.

Application Areas

• Construction machinery: winches, drive systems, auxiliary actuators
• Marine equipment: anchor winches, net haulers
• Industrial equipment: conveyors, mixers, rotary actuators
• Hydraulic systems requiring high-torque, high-speed fixed-displacement drive

Expert Maintenance Tips

• Before installation, confirm rotation and shaft type match the host machine. Ensure the drain port is unrestricted and free of back pressure to protect bearings.
• Use anti-wear hydraulic oil with cleanliness meeting ISO 4406 18/16/13 or better; maintain suitable viscosity at operating temperature. Run at low speed during cold starts.
• Keep inlet pressure within recommended limits; regularly check shaft seals and external drain condition.
• When replacing the cartridge, maintain strict cleanliness and correct assembly sequence; perform air bleeding and low-pressure test run afterward.
• Perform preventive inspections every 2000–4000 hours depending on duty cycle; monitor noise, temperature and any torque changes, and replace worn cartridges promptly.