161-0085-005 Eaton Char-Lynn VIS 30 Hydraulic Motor

Product Overview

The Eaton Char-Lynn VIS Series is a low-speed, high-torque orbital hydraulic motor platform designed for demanding traction, wheel-drive and industrial rotary applications.

Eaton’s historical technical catalog E-MOLO-MC001-E5 explicitly classifies the 161- prefix as VIS 30 and the 168- prefix as VIS 40. Therefore, the requested references represent two different VIS platforms rather than one generic motor family.

The requested part numbers are:

• 161-0085-003
• 161-0028-002
• 161-0085-005
• 168-0044-005

Public cross-reference data associates the three 161-series numbers with a 400 cm³/rev VIS 30 configuration, including a 12-tooth spline, 38.4 mm shaft diameter, 127 mm pilot and 114.5 mm bolt-circle geometry.

The 168-0044-005 is directly identified as an Eaton Char-Lynn VIS 40, with 505 cm³/rev displacement. Manufacturer-distributor data lists 151 L/min continuous flow, 279 rpm continuous speed and 2240 Nm continuous torque for this specific configuration.

For replacement applications, complete configuration matching is essential. Displacement alone is not sufficient to establish drop-in compatibility.

Technical Specifications

161-0085-003 / 161-0028-002 / 161-0085-005

Public cross-reference records associate these three numbers with a common VIS 30 / 400 cm³ configuration.

• Brand: Eaton Char-Lynn
• Series: VIS 30
• Product Type: LSHT Orbital / Valve-In-Star Hydraulic Motor
• Part Numbers: 161-0085-003 / 161-0028-002 / 161-0085-005
• Displacement: 400 cm³/rev
• Displacement: approximately 24.4 in³/rev
• Output Shaft: 12-tooth spline
• Shaft Diameter: 38.4 mm
• Pilot Diameter: 127 mm
• Bolt Circle: 114.5 mm
• Working Ports: 1-1/16 UNF
• Additional Port Configuration: 9/16 UNF shown in cross-reference data
• Application Association: Bobcat skid-steer and hydrostatic drive applications are associated with these references.

The Eaton historical catalog confirms the 161- prefix is VIS 30, but the exact complete configuration code for each of these three individual part numbers is not fully recoverable from the public text available here. Accordingly, exact pressure, torque-at-pressure, maximum speed and weight are not artificially assigned to each part number.

168-0044-005

The 168-0044-005 configuration is identified as an Eaton Char-Lynn VIS 40 motor.

• Brand: Eaton Char-Lynn
• Series: VIS 40
• Product Type: LSHT Orbital / Geroler Hydraulic Motor
• Part Number: 168-0044-005
• Displacement: 505 cm³/rev
• Displacement: 30.7 in³/rev
• Maximum Continuous Flow: 151 L/min / 40 gpm
• Maximum Intermittent Flow: 170 L/min / 45 gpm
• Maximum Continuous Speed: 279 rpm
• Maximum Intermittent Speed: 293 rpm
• Maximum Continuous Torque: 2240 Nm
• Maximum Intermittent Torque: 2746 Nm
• Working Port: 1-1/16-12 UN-2B SAE O-Ring
• Case Flow: Check valve with leakage orifice, no case drain
• Mounting: Four-bolt
• Pilot Diameter: 127 mm / 5.000 in
• Bolt Circle: 161.92 mm / 6.375 in
• Bearing Configuration: Bearingless
• Housing Material: Cast Iron
• Speed Sensor: No
• Brake: None
• Weight: approximately 47 lb / 21.3 kg
• Recommended System Working Temperature: -34°C to 82°C

SunSource lists the specific configuration with an intermittent pressure value of 345 bar / 5,000 psi, while the Eaton VIS 40 technical performance data for the 505 cm³/rev size extends to the 345-bar operating column.

Control Method

VIS motors are generally fixed-displacement LSHT orbital motors.

The basic hydraulic relationships are:

• Motor speed: primarily determined by hydraulic flow
• Output torque: primarily determined by differential pressure and displacement
• Rotation: determined by hydraulic flow direction
• Displacement control: fixed in standard single-speed configurations

Eaton also provides two-speed VIS 30 and VIS 40 motors, allowing two displacement/performance ranges through an external three-way control valve. Therefore, two-speed configurations must be evaluated separately from standard single-speed motors.

Key Technical Advantages

1. Valve-In-Star Orbital Architecture

The VIS platform uses Eaton’s valve-in-star architecture together with Geroler® technology and an integrated rotary powertrain.

The design is intended to provide:

• High torque
• Smooth low-speed operation
• Compact packaging
• Efficient hydraulic-to-mechanical power conversion

2. Geroler® Powertrain

Eaton describes the Geroler® as a roller-based internal displacement element engineered to reduce friction and provide efficient hydraulic motor operation.

For larger-displacement VIS 40 configurations such as 168-0044-005, the large displacement element contributes to substantial output torque at relatively low speed.

3. Pressure-Zone and Case-Management Architecture

Eaton documentation describes case-drain and shuttle-valve arrangements that can provide system flushing and cooling while helping control case pressure.

This is particularly useful for closed-loop traction and other high-duty hydraulic circuits.

4. Heavy-Duty Shaft and Mounting Options

VIS motors are available in various shaft and mounting configurations.

The requested references illustrate this platform flexibility:

• 161-series: 400 cm³ configuration with 12-tooth spline and 38.4 mm shaft
• 168-0044-005: 505 cm³ VIS 40 configuration

Such configurations are well suited to wheel, sprocket and traction drives.

5. Environmental Protection Options

Eaton VIS motors support options such as:

• Seal Guard
• Viton seals
• Environmental protection
• Case-drain configurations

Eaton explains that the Seal Guard protects the shaft-seal region from contamination rather than acting as the primary hydraulic seal.

6. Two-Speed and Speed-Sensing Options

Eaton provides speed-sensor and two-speed options for VIS 30 and VIS 40 platforms. Two-speed versions can provide two operating speed/torque ranges without changing motor input flow or pressure.

Application Areas

161-0085-003 / 161-0028-002 / 161-0085-005

Public cross-reference records associate these references with Bobcat S175, S185, 753 and related skid-steer drive applications.

Typical applications include:

• Skid-steer loader drives
• Hydrostatic drives
• Wheel drives
• Traction systems
• Agricultural machinery
• Material handling equipment
• Compact construction equipment

168-0044-005

The specific 168-0044-005 configuration is associated with:

• Skid-steer loaders
• Skid-steer attachments
• Snow-removal equipment

The broader Eaton VIS platform is also used for:

• Traction drives
• Conveyors
• Winches
• Augers
• Sweepers
• Marine winches
• Industrial drives
• Forestry equipment
• Turf equipment

Expert Maintenance Tips

1. Match the Complete Configuration

Do not select the motor by the series name alone.

Verify:

• Complete part number
• Shaft spline
• Pilot diameter
• Bolt circle
• Port thread
• Case-drain configuration
• Rotation
• Bearing configuration
• Valve options

This is particularly important for the three 161-series references.

2. Check Spline Alignment and Shaft Runout

For the common 161-series 12T / 38.4 mm drive configuration, verify:

• Spline condition
• Shaft concentricity
• Coupling alignment
• Pilot fit
• Mounting-face flatness

The referenced Bobcat cross-reference data identifies the 12T spline, 38.4 mm shaft, 127 mm pilot and 114.5 mm bolt-circle geometry.

3. Control Case Pressure

Eaton’s VIS documentation emphasizes case-drain and shuttle-valve functions for cooling, flushing and case-pressure management.

Excessive case pressure should be avoided, particularly at high speed and high temperature.

4. Control Hydraulic Shock

Traction, winch and conveyor drives can generate high transient pressure during:

• Sudden stopping
• Direction reversal
• Load impact
• Valve switching

Use appropriate relief, crossover or counterbalance arrangements where required.

5. Consider Seal Guard in Contaminated Environments

Eaton’s Seal Guard is designed to protect the shaft-seal area from foreign material such as dirt and debris.

It can be valuable for:

• Skid-steer machinery
• Agricultural equipment
• Sweepers
• Forestry equipment
• Mining equipment

6. Perform 100% Simulated Operating-Condition Testing

For replacement VIS 30 / VIS 40 motors, recommended factory QA includes:

• Displacement verification
• Pressure testing
• Flow testing
• Speed verification
• Starting-torque testing
• Continuous-torque testing
• Internal-leakage testing
• Rotation-direction testing
• Shaft runout inspection
• Spline inspection
• Case-pressure verification
• Temperature-rise testing
• Noise and vibration testing
• Complete configuration verification

For 168-0044-005, particular attention should be given to the published 505 cm³/rev displacement, 151 L/min continuous flow, 279 rpm continuous speed and 2240 Nm continuous torque operating data.