161-0085-003 Eaton Char-Lynn VIS 40 Hydraulic Orbital Motor

Product Overview

The 161-0085-003, 161-0028-002, and 168-0044-005 are low-speed, high-torque (LSHT) orbital hydraulic motors belonging to the Eaton Char-Lynn VIS 40 Series. These motors feature proven gerotor technology, delivering high starting torque, smooth operation, and excellent volumetric efficiency. They are widely used in propulsion systems for skid steer loaders, compact track loaders, and other construction equipment.

The 161-0085-003 and 161-0028-002 are standard-configuration models within the VIS 40 Series, while the 168-0044-005 is a high-torque reinforced variant. All models are manufactured to Eaton Char-Lynn’s rigorous quality standards, featuring high-strength cast iron housings and precision-ground gerotor gear sets that deliver reliable power output under demanding operating conditions.

As a premium aftermarket alternative to original Eaton Char-Lynn VIS 40 Series orbital motors, this product is manufactured to strict Eaton OEM specifications, ensuring 100% interchangeability with original equipment. Cross-reference part numbers include 161-0085-003, 161-0085-005, 161-0028-002, 168-0044-005, and ACD24A00AA128E1E. Every motor undergoes 100% simulated load testing prior to shipment to verify performance and reliability under rated operating conditions.

Technical Specifications 

161-0085-003 / 161-0085-005 (VIS 40 Series Standard)

• Product Series: Eaton Char-Lynn VIS 40 Series Orbital Hydraulic Motor

• Design Type: Gerotor

• Control Type: Bi-directional rotation, hydraulic control

• Mounting Interface: Compliant with Char-Lynn VIS 40 Series standard

• Cross-Reference Part Numbers: 161-0085-003, 161-0085-005, 1610085003, 1610085005, 161-0085, 1610085

• Typical Application: Bobcat S175 skid steer loader drive motor

161-0028-002 (VIS 40 Series Standard)

• Product Series: Eaton Char-Lynn VIS 40 Series Orbital Hydraulic Motor

• Design Type: Gerotor

• Control Type: Bi-directional rotation, hydraulic control

• Mounting Interface: Compliant with Char-Lynn VIS 40 Series standard

• Cross-Reference Part Numbers: 161-0028-002, 1610028002, 161-0028, 1610028

• Typical Application: Bobcat S130/S175 skid steer loader drive motor

168-0044-005 (VIS 40 Series High-Torque)

• Product Series: Eaton Char-Lynn VIS 40 Series Orbital Hydraulic Motor

• Design Type: Gerotor, high-torque reinforced design

• Control Type: Bi-directional rotation, hydraulic control

• Mounting Interface: Compliant with Char-Lynn VIS 40 Series standard

• Cross-Reference Part Numbers: 168-0044-005, 1680044005, 168-0044, 1680044

• Typical Application: Bobcat skid steer loader drive motor

Key Technical Advantages

1. Proven Gerotor Technology
The VIS 40 Series utilizes Eaton Char-Lynn’s decades-proven gerotor technology, with precision meshing between the inner and outer gear sets for efficient energy conversion. This design delivers exceptional torque density within a compact footprint, with high starting torque and excellent low-speed stability—ideal for propulsion applications requiring frequent start-stop operation.

2. 100% Interchangeable Design
All models are manufactured to strict Eaton Char-Lynn VIS 40 Series mounting interface standards, enabling bolt-for-bolt direct replacement of original equipment. No modifications or adapters are required, significantly reducing equipment downtime and retrofit costs.

3. High-Strength Cast Iron Housing & Precision Machining
High-strength cast iron housings provide excellent shock and vibration resistance. Gerotor gear sets are precision-ground with tightly controlled clearances, ensuring high volumetric efficiency even under high-pressure conditions. All critical friction surfaces undergo surface hardening treatment for extended service life.

4. High-Reliability Sealing System
Standard high-pressure shaft seals prevent oil leakage along the shaft. The optimized sealing design maintains excellent sealing performance under high-pressure, high-speed operating conditions, reducing maintenance frequency and operating costs.

5. Broad Operating Condition Adaptability
The VIS 40 Series motors accommodate a wide range of hydraulic system configurations with bi-directional rotation capability. Whether for frequent direction changes in skid steer loader operations or continuous load driving in other construction equipment, these motors deliver stable and reliable power output.

Application Areas

• Skid Steer Loaders: Bobcat S130, S175 drive motors

• Compact Track Loaders: Propulsion systems

• Compact Track Loaders (CTL) : Traction drives

• Mini Excavators: Propulsion and attachment drives

• Material Handling Equipment: AGV drive wheels, forklift auxiliary drives

• Municipal Equipment: Sweepers, small roller traction drives

Expert Maintenance Tips

Installation Guidelines:

1. Model Verification: Before installation, verify the motor model and physical dimensions on the original equipment. This series includes multiple models including 161-0085-003, 161-0085-005, 161-0028-002, and 168-0044-005—different models may vary in torque output and mounting interfaces. Ensure correct model selection.

2. Fluid Cleanliness: Maintain system fluid cleanliness to ISO 4406 18/16/13 minimum. Inlet fluid must pass through 10μm absolute filtration. Gerotor motors are sensitive to fluid contamination—insufficient cleanliness will directly impact gerotor gear set life and volumetric efficiency.

3. Shaft Alignment: Precise alignment between motor output shaft and driven load is critical. Misalignment significantly reduces bearing life and increases side loading, potentially leading to premature shaft seal failure.

4. Mounting Bolt Torque: Mounting bolts must be torqued to Eaton Char-Lynn specified values and re-torqued after initial operation.

Routine Maintenance:

1. Leak Inspection: Regularly inspect housing and shaft seal areas for oil seepage. Replace seals immediately if leakage is detected to prevent fluid loss and environmental contamination.

2. Fluid Change Interval: Initial fluid change at 100 hours, thereafter every 1000 operating hours or annually, whichever comes first.

3. Operating Duty Monitoring: Operate motors within continuous duty ratings. Avoid extended overload operation to maximize motor service life.

4. Vibration & Noise Monitoring: If abnormal vibration or increased noise is detected during operation, shut down immediately for inspection to identify potential gerotor gear set wear or bearing damage.