111A 112A Hydraulic Orbit Motor | Eaton Char-Lynn H/S Series Replacement

Genlu Hydraulic proudly introduces our 111A and 112A Series industrial and mobile-grade low-speed high-torque (LSHT) hydraulic orbit motors. Engineered around a classical spool valve fluid distribution matrix paired with a high-efficiency gerotor/geroler gear set, this motor series thrives in compact physical spaces requiring relentless torque transmission. It is widely specified across modern agricultural implements (such as seeder drives and harvester reels), plastic injection molding mold-adjusting systems, factory conveyor drives, municipal sweeper brooms, and utility vehicle winches. This series serves as a premium-manufactured, performance-verified, and exact drop-in replacement for the global industry benchmark H Series (111A- code prefix) and S Series (112A- code prefix) micro orbit motors engineered by Eaton Char-Lynn. We specialize in supplying standard and high-pressure configurations, prominently covering individual part numbers like 111A-129-AT-0, 112A-088-AT-0-F, 112A-106-AT-O-F, and 112A-088-AM-O-F.

Serving as a robust “fluid torque core” in light-to-medium machinery structures, Genlu’s 111A/112A orbit motors strictly match international standard mounting and shaft extension configurations. We guarantee 100% Drop-in Interchangeability across standard SAE 2-bolt diamond mounting flanges, 1-inch cylindrical parallel keyed shafts, standard splined shaft profiles, and standard SAE/G threaded port configurations. Prior to leaving our facility, each individual orbit motor assembly undergoes 100% minimum starting torque threshold validation, low-rpm smooth anti-cogging verification, and high-back-pressure shaft seal isolation checks, ensuring continuous torque delivery without rotational blind spots.

Technical Specifications 

• Product Line: 111A Series (H-Series Component Standard) / 112A Series (S-Series Component Standard) Hydraulic Orbit Motor

• Core Covered Model Layouts:

  • 111A-129-AT-0 (H-Series platform, displacement approx. 129 $cc/rev$, parallel keyed shaft, standard SAE ports)

  • 112A-088-AT-0-F (S-Series platform, fitted with auxiliary case options, displacement approx. 88 $cc/rev$)

  • 112A-106-AT-O-F (S-Series platform, displacement approx. 106 $cc/rev$)

  • 112A-088-AM-O-F (S-Series platform, tailored displacement with specific parallel shafting or specialized industrial ports)

• Continuous Rated Operating Pressure: 14.0 MPa to 16.5 MPa (140 bar to 165 bar / 2030 psi to 2400 psi)

• Maximum Intermittent Peak Pressure: 20.0 MPa (200 bar / 2900 psi)

• Output Torque Envelope: Continuous output torque from 200 $N\cdot m$ up to 410 $N\cdot m$ (depending on specific displacement size)

• Rotational Shaft Velocity Range: Minimum stable velocity down to 10 rpm; Maximum continuous velocity up to 600 rpm to 800 rpm

• Fluid Distribution Configuration: Spool Valve Geometry

• Mounting Flange Layout: Standard SAE 2-bolt diamond pilot flange

• Output Drive Shaft Styles: 1-inch cylindrical straight keyed shaft (with standard flat key) or standard involute splined shaft

Key Technical Advantages:

• Precision Geroler® Geometric Gear Set Design: The internal design of the 112A series (S-Series replacement) features integrated precision rollers within the fixed stator teeth. Compared to the solid star configuration of the 111A (H-Series), these rolling elements significantly lower mechanical friction during gear mesh. This prevents stick-slip “cogging” at low speeds (under 30 rpm), ensuring smooth rotational output and a high mechanical starting torque efficiency.

• Three-Layer High-Pressure Shaft Seal Assembly: Features an advanced dynamic shaft seal arrangement that allows the motor to withstand continuous back-pressures up to 10 MPa without requiring an external case drain line. This design protects the seal from blowing out and prevents external leaks if the main return line encounters transient fluid spikes.

• Hardened Drive Linkage & Integrated Spool Valve: The internal cardan drive link is machined from high-strength alloy steel, induction hardened, and profile-ground to provide excellent torsional fatigue limits. The spool valve geometry is ground inline with the drive axis to ensure microsecond-scale fluid symmetry during direction reversals, minimizing internal slippage.

• High-Damping Ductile Iron Casing: The main housing is cast from high-grade ductile iron, with internal bearing journals bored to precise geometric tolerances. This rigid structure supports heavy radial loads and moderate axial thrust while absorbing the physical shocks and vibrations common in conveyor and sweeper operations.

Application Areas:

• Modern Agricultural Machinery: Reel speed control for combine harvesters, input shaft drives for vacuum seeders, and spinner drives for fertilizer spreaders.

• Industrial Automation & Material Handling: Head-pulley drive rollers for warehouse belt conveyors and indexing drives for factory rotators.

• Municipal Cleaners & Utility Vehicles: Main rotary drive for municipal sweeper side-brooms and vehicle-mounted utility hydraulic winches.

Expert Maintenance Tips:

• Carefully Cross-Check the “F” Suffix and Port Thread Designations: Alphanumeric suffixes such as 112A-088-AT-0-F often denote specific fluid port threads (e.g., Metric vs. BSPP or US UNF) or secondary drain options. Always verify the thread pitch and port diameter with calipers before installing fittings—never force an unmatched connector into place. Forcing a mismatched fitting can strip the cast iron threads or fracture the port base under high pressure, leading to external fluid leaks.

• Connect an External Case Drain When Operating in High-Back-Pressure Circuits: Although the 111A/112A shaft seals are rated for high back-pressures, we strongly recommend utilizing the independent case drain port and routing it directly to the reservoir if the motors are plumbed in series, or if the return line is exceptionally long. Keeping this drain line unbundled can extend the life of the primary shaft seal by 2 to 3 times.

• Do Not Exceed Permissible Radial Shaft Loads or Rotational Limits: Spool valve orbit motors rely on a fine hydrodynamic fluid film for internal shaft lubrication. Over-tensioning drive belts or mounting heavy pulleys directly onto the shaft end without outboard supports can induce asymmetric bearing wear. This wear can cause the spool axis to run eccentrically, leading to a sharp drop in volumetric efficiency or internal component seizing.

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