119-1031-006 Eaton Char-Lynn 10000 Series 940cc Motor

Product Overview

The 119-1031-006 is a heavy-duty disc-valve orbital hydraulic motor in the Eaton Char-Lynn 10000 Series (10K Series), representing the largest displacement specification in the series. Featuring an efficient Geroler star wheel roller mechanism and an innovative disc valve distribution system, the motor achieves a power output of over 90 horsepower within a compact structure and is recognized as one of the motors with the lowest pressure loss in the industry. The disc valve design significantly optimizes internal oil circuits, reduces energy loss, and directly delivers fuel or electricity savings for the user.

Designed as a 100% drop-in replacement for Eaton Char-Lynn 10000 series motors (including 119-1031-003, 119-1030-003, 119-1029-003, 119-1028-003, and 119-1032-003), the 119-1031-006 matches mounting flanges, shaft specifications, and port configurations exactly — no system modification required. Tapered roller bearings are installed at both front and rear ends, endowing the motor with excellent radial and axial load-bearing capacity for demanding heavy-duty drive applications. Every unit undergoes 100% simulated load testing before shipment, validated across rated pressure, rated speed, and peak torque conditions.

Technical Specifications 

• Model: 119-1031-006

• Brand Series: Eaton Char-Lynn 10000 Series (10K Series)

• Equivalent Model: BMK10-940

• Geometric Displacement: 940 cm³/rev (57.4 in³/rev)

• Rated Pressure (Continuous): 20 MPa (200 bar / 2900 psi)

• Max Pressure (Intermittent): 27.5 MPa (275 bar / 4000 psi)

• Peak Pressure: 27.5 MPa

• Max Continuous Speed: 179 rpm

• Max Intermittent Speed: 279 rpm

• Max Continuous Torque: 2700 N·m

• Max Intermittent Torque: 3440 N·m

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

• Max Intermittent Flow: 265 L/min (70 GPM)

• Control Type: Disc valve distribution with Geroler star wheel roller mechanism

• Bearing Type: Tapered roller bearings (front and rear)

• Mounting Flange: SAE C 4-bolt square flange, pilot Ø127.0 mm

• Shaft Type: Cylindrical Ø57.15 mm (2-1/4 inch), key 12.7 mm (1/2 inch)

• Port Size: 1-5/16-12 SAE O-ring port

• Drain Port: 0.5625-18 UNF-2B SAE O-ring port

• Rotation: Bi-directional

• Max Case Pressure (without external drain): 20 bar (300 psi)

• Weight: Approx. 28 kg (standard model)

Key Technical Advantages

1. Ultra-Low Pressure Loss Disc Valve Technology

The 119-1031-006 features an innovative disc valve distribution system that significantly reduces pressure loss compared to conventional shaft distribution structures by optimizing internal oil circuit design. This technology enables the motor to maintain high efficiency at 940cc displacement, recognized as one of the motors with the lowest pressure loss in the industry, directly saving hydraulic system energy consumption for the user.

2. Geroler Star Wheel Roller Mechanism with High Starting Torque

The stator-rotor pair utilizes an efficient Geroler star wheel roller mechanism, which produces less friction and smoother transmission than traditional gear mechanisms, providing extremely high starting torque and running torque — particularly suited for heavy-load start-stop conditions. The mechanism maintains high efficiency in both rotational directions, meeting bi-directional drive requirements.

3. Front and Rear Tapered Roller Bearing System

Tapered roller bearings are installed at both the front and rear ends of the output shaft, endowing the motor with excellent radial and axial load-bearing capacity and significantly extending service life under harsh working conditions. This design allows the motor to directly drive the working mechanism without additional external bearing support, simplifying the drivetrain architecture.

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

The high-pressure shaft seal design allows the motor to withstand case pressures up to 20 bar (300 psi) without an external drain line. When back pressure exceeds 20 bar, 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 119-1031-006 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

• Construction Machinery: Trenchless drilling rigs, horizontal directional drills, auger boring machines, skid steer loaders

• Agricultural Machinery: Combine harvester drive systems, large rotary tiller blade shaft drive, silage harvesters

• Material Handling: Heavy-duty winch/haulage drive, conveyor drive, port lifting equipment

• Mining & Oil Equipment: Drill rig rotary drive, mud pump drive, coal conveying equipment

• Industrial Equipment: Metal forming equipment, saw mill drive, specialty vehicle 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 SAE C 4-bolt flange pilot Ø127.0 mm fits flush against the mounting surface. Tighten bolts in a diagonal sequence to the specified torque. Confirm proper key (12.7 mm) fit between shaft and coupling to avoid eccentric loading.

Case Drain Configuration: When system back pressure exceeds 20 bar (300 psi), connect an external drain line to the 0.5625-18 UNF-2B drain port. The drain line should remain unobstructed with the outlet submerged below reservoir oil level to prevent air ingestion. Install a restrictor in the drain line 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 Geroler star wheel roller pair, disc 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.