45M185A1C20 Vickers Eaton M Series Vane Motor 193.2cc 172bar

Product Overview

The 45M185A1C20 (45M-185A-1C-20), 45M130A1A20 and 45M155A11C20 models belong to the Eaton Vickers (now Danfoss) M-Series high-speed, high-pressure hydraulic vane motors. Featuring a hydraulically balanced cartridge with dual pressure plates, these motors achieve volumetric efficiency consistently above 90%. We specialize in the R&D and manufacturing of high-pressure pumps, motors and valve blocks. Our products deliver 100% drop-in interchangeability with genuine Vickers/Eaton units and undergo 100% simulated operating-condition testing. Precision machining and high-quality materials ensure reliable high-torque output under high-pressure, high-speed and heavy-load conditions for industrial and mobile hydraulic systems.

Technical Specifications

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

• Series: 45M (standard bearing) / 46M (heavy-duty bearing)
• Typical models:
  • 45M185A1C20 / 45M-185A-1C-20: Displacement 193.2 cm³/r, torque rating 20.9 Nm/6.9 bar (185 lb.in/100 psi), keyed shaft, cover ports in line
  • 45M130A1A20: Displacement 138.0 cm³/r, torque rating 14.7 Nm/6.9 bar (130 lb.in/100 psi), keyed shaft, cover ports opposite body ports
  • 45M155A11C20: Displacement 163.2 cm³/r, torque rating 17.5 Nm/6.9 bar (155 lb.in/100 psi), splined shaft, cover ports in line
• Continuous pressure: approx. 155 bar (2250 psi)
• Peak/intermittent pressure: 172 bar (2500 psi)
• Maximum speed: 2600 r/min @ 155 bar; 3000 r/min @ 172 bar
• Control: Fixed displacement, bi-rotational (reverse by reversing inlet flow), externally drained
• Mounting & ports: A = SAE 2-bolt mounting flange + SAE 4-bolt flange ports
• Shaft type: 1 = straight keyed; 11 = splined
• Cover position: A = opposite body ports; C = in line with body ports
• Design number: 20 (and subsequent compatible designs)
• Approximate weight: 39 kg (85 lb)
• Other: Dual pressure plates for low internal leakage; hydraulically balanced radial loads

Key Technical Advantages

1. Hydraulically balanced cartridge and dual pressure-plate precision design: Symmetrical inlet chambers fully cancel radial forces, significantly reducing bearing and friction-pair loads. High starting torque and volumetric efficiency stably above 90%.
2. High volumetric efficiency and low-noise operation: Optimized vane, cam-ring and pressure-plate geometry minimizes internal leakage, delivering smooth, quiet running ideal for efficiency- and noise-sensitive applications.
3. Long-life bearing and sealing system: Standard bearing configuration suits normal duty; optional heavy-duty bearings (46M series) further enhance shock resistance and continuous heavy-load capability. Premium sealing materials extend service life.
4. 100% drop-in interchangeability and simulated-condition testing: Overall dimensions, mounting interfaces, shaft types, port positions and performance curves match genuine Vickers/Eaton units exactly for direct replacement. Every unit is 100% tested under simulated operating conditions to verify pressure, speed, torque and sealing performance.
5. Flexible configurations for engineering needs: Keyed or splined shafts and multiple cover-port orientations allow easy adaptation to diverse machine layouts and transmission requirements.

Application Areas

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

Expert Maintenance Tips

• Before installation, carefully verify the shaft type (1/11) and cover position (A/C) in the model code to ensure exact match with the host machine. Torque flange bolts to SAE specifications to avoid misalignment loads.
• Use hydraulic oil with cleanliness of NAS 7 or better; maintain operating viscosity in the 20–100 cSt range. Run at low speed and low 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; inspect vane and seal wear promptly.
• Reverse rotation simply by switching inlet flow direction—no mechanical adjustment is required. Avoid prolonged operation beyond rated pressure or speed.
• Perform preventive maintenance every 2000–4000 hours depending on duty cycle: replace shaft seals and check cartridge component condition.