45M-185A-1C-20 Vickers Eaton Hydraulic Vane Motor 193.2cc 172bar

Product Overview

The 45M-185A-1C-20, 35M-115A-1C-20, 45M-185-11C-20 and 26M-65A-1C-20 models belong to the Eaton Vickers (now Danfoss) M-Series high-speed, high-pressure hydraulic vane motors. Featuring a hydraulically balanced cartridge design with dual pressure plates, these motors deliver volumetric efficiency above 90%. We specialize in 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. Materials, machining and performance fully match original specifications, ensuring reliable high-torque output under high-pressure and high-speed conditions for industrial and mobile applications.

Technical Specifications

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

• Series: 25M/26M (standard/heavy-duty bearing), 35M/36M, 45M/46M, 50M/51M
• Typical models:
  • 45M-185A-1C-20: Displacement 193.2 cm³/r, torque rating 20.9 Nm/6.9 bar (185 lb.in/100 psi)
  • 35M-115A-1C-20: Displacement 121.9 cm³/r, torque rating 13.0 Nm/6.9 bar (115 lb.in/100 psi)
  • 26M-65A-1C-20: Displacement 68.7 cm³/r, torque rating 7.3 Nm/6.9 bar (65 lb.in/100 psi) (heavy-duty bearing)
  • 45M-185-11C-20: Same displacement and torque, splined shaft version
• Pressure rating: Continuous approx. 155 bar (2250 psi), peak/intermittent 172 bar (2500 psi)
• Maximum speed (45M series): 2600 r/min @ 155 bar; 3000 r/min @ 172 bar
• Maximum speed (35M series): approx. 3000 r/min @ 172 bar
• Maximum speed (25M/26M series): 3600–4000 r/min @ 34 bar
• Control: Bi-rotational (reverse by reversing inlet flow), fixed displacement, externally drained
• Mounting & ports: A = SAE 2-bolt mounting flange + SAE 4-bolt flange ports; Shaft 1 = keyed, 11 = splined; Cover position C = ports in line
• Approximate weight: 35M ≈ 29 kg; 45M ≈ 39 kg; 50M ≈ 73 kg; 26M heavy-duty slightly higher than standard
• Other: Dual pressure plates for low internal leakage; hydraulically balanced radial loads

Key Technical Advantages

1. Precision balanced cartridge and dual pressure-plate design: Symmetrical inlet chambers fully balance radial forces, minimizing bearing load and frictional heat. Volumetric efficiency remains stably above 90% with high starting torque.
2. High volumetric efficiency and low noise: Optimized vane-to-ring fit and pressure-plate sealing drastically reduce internal leakage, resulting in quiet operation ideal for noise-sensitive and energy-efficient applications.
3. Heavy-duty bearing options and long service life: 26M/36M/46M/51M series incorporate heavy-duty bearings for superior shock and continuous heavy-load resistance. Premium bearings and seals extend overall life.
4. 100% drop-in interchangeability and simulated-condition testing: Dimensions, mounting interfaces and performance curves match genuine Vickers/Eaton units exactly for direct replacement. Every unit undergoes 100% simulated operating-condition testing to verify pressure, speed, torque and sealing performance.
5. Flexible shaft and mounting configurations: Keyed or splined shafts and multiple cover-port orientations simplify integration into diverse machine layouts.

Application Areas

• Construction and agricultural machinery: scraper drives, auxiliary travel, winches and hoists
• Industrial hydraulic systems: conveyor drives, hydraulic winches, test stands and specialized equipment main/auxiliary drives
• Marine and port equipment: fishing trawler winches, anchor windlasses, deck machinery
• Mobile equipment and special vehicles: hydrostatic drive auxiliary circuits and high-torque low-speed applications

Expert Maintenance Tips

• Verify port orientation and shaft type match the host machine before installation; torque flange bolts to SAE specifications to avoid misalignment loads.
• Use hydraulic oil with cleanliness NAS 7 or better; maintain proper viscosity at operating temperature (typically 20–100 cSt per original guidelines). Run at low speed and pressure during cold starts until oil reaches normal temperature.
• Keep the external drain line free-flowing to prevent excessive case pressure that can damage shaft seals. Monitor case temperature and unusual noise during operation; replace seals and cartridge components promptly when needed.
• Reverse rotation simply by switching inlet flow direction—no mechanical adjustment required. Heavy-duty bearing versions (26M series etc.) better handle frequent start-stop or shock loads, but never exceed pressure or speed limits.
• Perform preventive maintenance every 2000–4000 hours or according to duty cycle: replace shaft seals and inspect vane wear.