161-0085-005 Eaton Char-Lynn VIS 40 Motor 400cc 310 bar

Product Overview

The 161-0085-005 is a heavy-duty valve-in-star orbital hydraulic motor in the Eaton Char-Lynn VIS 40 Series. The VIS Series employs Eaton’s patented Valve-In-Star technology, integrating the distribution valve directly inside the stator-rotor set with only three moving parts, delivering an extremely compact yet powerful package with exceptional power density. The VIS 40 Series achieves a maximum continuous output torque of up to 2531 N·m with displacements ranging from 505cc to 940cc, making it one of the highest-torque series in the Eaton Char-Lynn product line.

The 161-0085-005 is a 100% drop-in replacement for Eaton Char-Lynn VIS 40 Series motors, matching mounting flanges, shaft specifications, and port configurations exactly. Compatible part numbers include 161-0085-003, 1610085, 161-0028, and ACD24A00AA128E1E — no system modification required. Suitable for skid steer loaders, snow removal equipment, and heavy-duty travel drive applications, every unit undergoes 100% simulated load testing before shipment.

Technical Specifications (Bulleted List)

• Model: 161-0085-005

• Brand Series: Eaton Char-Lynn VIS 40 Series (Valve-In-Star 40)

• Displacement: 400 cm³/rev (400cc/r)

• Rated Pressure (Continuous): 310 bar (4500 PSI / 31 MPa)

• Intermittent Pressure: 345 bar (5000 PSI / 34.5 MPa)

• Peak Pressure: 380 bar (5500 PSI / 38 MPa)

• Max Continuous Output Torque: 1781 N·m

• Max Continuous Flow: 151 L/min (40 GPM)

• Max Intermittent Flow: 170 L/min (45 GPM)

• Max Continuous Speed: 357 rpm

• Max Intermittent Speed: 454 rpm

• Control Type: Valve-In-Star, distribution valve integrated inside stator-rotor set

• Number of Moving Parts: 3

• Bearing Type: Tapered roller bearings (standard & wheel mount)

• Port Size: 1-1/16 UNF main port / 9/16 UNF drain port

• Shaft Diameter: Ø38.4 mm (1-1/2 inch)

• Mounting Flange: Pilot Ø127 mm, bolt centers 114.5 mm

• Body Length: 212 mm

• Rotation: Bi-directional

• Recommended Viscosity: 37–73 cSt

• Oil Cleanliness: ISO 18/13

• Weight: Approx. 17.93 kg

Key Technical Advantages

1. Patented Valve-In-Star Technology

The VIS 40 Series utilizes Eaton’s patented Valve-In-Star technology, integrating the distribution valve inside the stator-rotor set for a motor with only three moving parts. This simplified structure dramatically reduces internal leakage paths and pressure losses, maintaining high volumetric efficiency at 310 bar operating pressure. The two-piece, pre-loaded pressure balance plate design further enhances distribution face sealing reliability, ensuring minimal performance degradation over extended service life.

2. 400cc Displacement with High Pressure and Torque Output

The 161-0085-005 achieves 1781 N·m maximum continuous torque and 310 bar continuous operating pressure at 400cc displacement, delivering class-leading power density. Its torque output capability meets the demanding requirements of skid steer loader travel drives, heavy-duty snow removal equipment, and other heavy-load applications requiring low-speed, high-torque output.

3. Tapered Roller Bearing System with High Radial Load Capacity

Tapered roller bearings are installed at the output end, capable of withstanding high radial and axial loads simultaneously, allowing the motor to directly drive wheels or sprockets without additional external bearing support. This design simplifies the drivetrain architecture, reduces overall system cost, and improves transmission reliability.

4. High-Pressure Shaft Seal with Series/Parallel Capability

The high-pressure shaft seal design allows the motor to withstand elevated case pressures without an external drain line. When back pressure exceeds the shaft seal rating, connecting an external drain line enables series or parallel motor configurations, simplifying system layout and enhancing hydraulic circuit design flexibility.

5. 100% Simulated Load Testing

Every 161-0085-005 is validated on a 100% simulated load test bench before shipment. Testing protocols cover continuous operation at rated pressure, cyclic intermittent pressure loading, peak torque output, and internal leakage measurement, ensuring delivered performance matches published specifications.

Application Areas

• Skid Steer Loaders: Bobcat S175 and similar models travel drive (direct interchange with OEM part 7499819)

• Snow Removal Equipment: Heavy-duty snow plow travel drive, snow blower brush drive

• Construction Machinery: Mini excavator travel drive, compact loader drive

• Municipal Vehicles: Road sweeper drive, refuse compactor travel drive

• Agricultural Machinery: Large tractor auxiliary drive, combine harvester travel drive

Expert Maintenance Tips

Pre-Installation Checklist: Verify system oil cleanliness meets ISO 18/13. Use a return filter rated at 10 μm or finer. Ensure the mounting flange pilot Ø127 mm fits flush against the mounting surface with bolt centers aligned at 114.5 mm. Tighten bolts in a diagonal sequence to the specified torque. Confirm proper fit between the Ø38.4 mm shaft and coupling to avoid eccentric loading.

Case Drain Configuration: When system back pressure exceeds the shaft seal rating, connect an external drain line to the 9/16 UNF drain port. The drain line should remain unobstructed with the outlet submerged below reservoir oil level to prevent air ingestion. Install a restrictor to maintain at least 3.5 bar case pressure.

Break-In Procedure: Before full-load operation, run new or overhauled motors at no more than 30% of continuous ratings for at least 30 minutes. This allows the stator-rotor set, distribution valve, and bearings to achieve optimal mating surfaces.

Fluid Management: Use 68# anti-wear hydraulic oil with working viscosity maintained at 37–73 cSt. Normal operating oil temperature should be 20–60°C. Monitor oil cleanliness regularly; replace hydraulic fluid and clean filters immediately when contamination exceeds ISO 19/16.

Long-Term Storage: For storage exceeding 3 months, fill the motor interior with clean hydraulic oil and plug all ports to prevent internal corrosion. Before recommissioning, manually rotate the shaft to confirm free movement without binding.