Eaton Char-Lynn H Series Hydraulic Motor 158-3425 158-3051-001 LSHT Gerotor Motor

The industrial-grade Eaton Char-Lynn Compatible H Series Low Speed High Torque (LSHT) Gerotor Hydraulic Motors, manufactured by Chengyuan Hydraulic, are heavy-duty rotary drive elements developed for high-stress industrial conveyors and off-highway mobile machinery traction networks. Serving as a global technical benchmark for gerotor technology, this motor lineup combines a precision-engineered gerotor gear set with a three-piece axial distributing valve architecture, delivering continuous, reliable torque output at low rotational speeds—making it ideal for circuits with frequent start-stop cycles or rapid directional reversals.

This comprehensive components portfolio targets B2B fluid power distribution channels, OEM agricultural machinery packagers, and global plant maintenance divisions, providing 100% direct drop-in interchangeability with Eaton Char-Lynn original factory reference part numbers, including: 158-3425, 158-3051-001, 101-2799-009, 158-3145-001, 158-1550-001, and 158-1450-001. These specific designations match standard H-series output shaft geometries, metric/SAE mounting patterns, and varied oil port configurations across global material handling networks.

Chengyuan’s alternative gerotor motors conform to official Eaton technical drawings regarding standard pilot diameters (such as standard SAE A 2-bolt arrangements), output drive shafts (1-inch straight keyed or 6B splined options), and manifold threading specifications. Plant maintenance technicians can execute field changeouts without adapting rigid machine mounting brackets or reworking high-pressure hose connections, ensuring immediate plug-and-play installation.

Gerotor motors operating in agricultural or material handling lines face harsh conditions, including high shock loads, sudden backpressure surges, and radial force from chain drives. Lower-grade alternatives often suffer from “low-speed stick-slip (crawling),” rapid flow losses due to distributor face wear, or high-pressure shaft seal failure. To guarantee long-term field uptime, 100% of Chengyuan’s H series replacement motors undergo 100% strict dynamic load testing on digitized simulation benches. Each motor is checked under full system pressure and peak load torques to verify hot volumetric efficiency, starting torque response, and case drain thresholds before packaging.

Technical Specifications

• Product Classification: Low Speed High Torque (LSHT) Gerotor Hydraulic Motor

• Compatible Reference Platform Series: Eaton Char-Lynn H Series (158- and 101- Manufacturing Sequences)

• Nominal Geometric Displacement Bandwidth: Ranging from 46 cc/rev to 370 cc/rev (2.8 to 22.6 $in^3/r$) depending on specific model selection

• Maximum Rated Continuous Operating Pressure: Up to 125 bar (12.5 MPa / 1800 psi)

• Maximum Permissible Intermittent Working Pressure: Up to 165 bar (16.5 MPa / 2400 psi)

• Peak Intermittent Circuit Pressure Threshold: 190 bar (19 MPa / 2750 psi)

• Maximum Rated Continuous Torque Output: Up to 410 Nm (3630 lb-in) scaled across specific displacement sizes

• Operational Rotational Speed Horizon: Spans from 30 rpm to 1020 rpm

• Maximum Permissible Continuous Inlet Flow Rate: 57 L/min (15 GPM)

• Output Drive Shaft Configurations: Matches factory standard 1-inch straight keyed shafting or standard SAE 6B 6-tooth splined geometry

• Mounting Flange Configurations: Standard SAE A 2-bolt mounting pattern or 4-bolt square face configurations

• Main Fluid Port Interfaces: 1/2-14 NPTF pipe threads, 7/8-14 UNF O-ring boss ports, or G 1/2 British standard parallel pipe threads

• Internal Shaft Seal Backpressure Capability: Equipped with premium high-pressure seals supporting up to 100 bar intermittent return line backpressure without external drain connection

Key Technical Advantages

• Axial Valve Distribution and Precision Gerotor Geometries: The internal gerotor gear profile is machined on state-of-the-art CNC profile grinders to maintain strict tolerances. The match-ground clearances, paired with a hydrostatically balanced axial valve plate, allow the motor to maintain a steady fluid film even at speeds down to 30 rpm. This eliminates low-speed stick-slip (crawling) and ensures smooth, consistent torque output.

• Duralast-Grade High-Pressure FKM Shaft Seal Matrix: The output shaft sealing configuration features an imported, steel-reinforced fluoropolymer (FKM) lip assembly. Engineered for elevated temperatures and high backpressures, it handles continuous internal pressure spikes up to 100 bar in non-drain line configurations, preventing external oil leaks under fluctuating return-line conditions.

• Hydrostatically Balanced Heavy-Duty Journal Bearings: The primary internal journal bearings are coated with an anti-friction alloy and include specialized static pressure oil grooves. This layout utilizes high-pressure oil from the main circuit for continuous lubrication and cooling, providing high radial load capacity to absorb external tension from direct-drive chains, pulleys, or wheel loads.

• High-Strength Ductile Iron Integral Housing Castings: The structural outer frame is cast from high-grade ductile iron (QT500-7) to provide robust material rigidity. Compared to standard gray iron casings, this design minimizes housing flex during rapid forward-reverse cycling or intense pressure spikes, maintaining internal running clearances to reduce noise and optimize mechanical efficiency.

Application Areas

Chengyuan’s high-performance replacement Eaton Char-Lynn H series gerotor hydraulic motors provide reliable rotary drive power across various industrial and mobile applications:

• Industrial Conveyors & Logistics Automation: Powering heavy-duty belt drives, flighted elevators, sorting systems, and manufacturing turntable assemblies.

• High-Demand Agricultural & Forestry Implements: Driving reel assemblies on combine harvesters, processing chains on potato harvesters, and specialized industrial forestry processing heads.

• Light Traction Drives & Utility Attachments: Powering auxiliary wheel drives on light compaction rollers, industrial lawn mowers, sweeping vehicle broom drives, and injection molding machine mold adjustment mechanisms.

Expert Maintenance Tips

• For Systems with Continuous Return Line Pressures Exceeding 70 bar, or in Applications Subject to Frequent High-Frequency Reversals, Connect an Independent, Low-Pressure Case Drain Line Directly to the Reservoir: Running under high backpressure without an external drain traps pressure inside the shaft seal cavity. This can soon deform or rupture the sealing lip, resulting in external oil leakage and reduced volumetric efficiency.

• Before Operating the Motor for the First Time, Manually Fill the Case Interior with Clean, Filtered Hydraulic Oil and Turn the Shaft Several Times by Hand: Gerotor motors contain only a thin film of rust-preventative oil from the factory. A dry start under system pressure can scratch or bind the precision gerotor profiles and drive splines during the first few seconds of operation, causing permanent performance loss or erratic low-speed operation.

• Monitor Oil Temperature and System Filtration Closely (10-Micron Absolute Filtration Recommended on the Main Return Line): Gerotor motors rely on precise mechanical clearances between the valve face and the gear set to maintain a seal. If hard particulate debris enters the circuit, it can gouge micro-grooves across these sealing surfaces, increasing internal bypass leakage, slowing operating speeds, or causing an internal mechanical jam.