Product Overview
This product family covers four Eaton Char-Lynn 2000 Series low-speed, high-torque geroler hydraulic motors: 104-4114-006, 104-1007-006, 104-1065-006, and 104-1388-006. The 2000 Series utilizes a standard disc valve and Geroler gear set design, renowned for its lowest pressure drop in the industry and highly efficient energy conversion.
All four models are manufactured to exact Eaton OEM engineering drawings, with flange, shaft, and port layouts identical to the original specification. This ensures true drop-in interchangeability without pipeline modification or bracket adjustment. Every motor undergoes 100% simulated-condition bench testing to verify torque stability, rotational smoothness, and zero-leakage performance.
Model Quick Index:
104-4114-006 — 306.6 cc/rev, SAE A 4-bolt standard flange, 14-tooth spline shaft, flange rotated 90°, 7/8-14 UNF ports
104-1007-006 — 306.6 cc/rev, SAE A 2-bolt standard flange, 1″ keyed shaft, 7/8-14 UNF ports
104-1065-006 — 195 cc/rev, SAE A 2-bolt flange, 1-1/4″ keyed shaft, 1-1/16-12 UN ports
104-1388-006 — 194.8 cc/rev, SAE A 4-bolt standard flange, 32 mm keyed shaft, G 1/2 BSP ports, primer finish
Technical Specifications
104-4114-006:
Model Number: 104-4114-006
Series: Eaton Char-Lynn 2000 Series
Displacement: 306.6 cm³/rev (18.71 in³/rev)
Mounting Flange: Standard 4-bolt; pilot Ø 82.6 mm (3.25 in)
Bolt Circle Diameter: 106.4 mm (4.19 in)
Mounting Hole Diameter: 13.59 mm (0.535 in)
Output Shaft: 31.75 mm (1.250 in) flat root side fit, 14-tooth, 12/24 DP 30° involute spline with M8×1.25 thread in end
Port Type: 7/8-14 UNF-2B SAE O-ring ports, staggered
Case Drain: Rear facing 7/16-20 UNF-2B SAE O-ring port
Maximum Flow Rate: 75 L/min (20 GPM)
Maximum Continuous Speed: 246 rpm
Rated Torque at Rated Pressure: Approx. 765 N·m
Control Type: Disc valve, fixed displacement
Special Feature: Flange rotated 90 degrees
Material: Cast Iron
Weight: Approx. 12.5 kg
104-1007-006:
Model Number: 104-1007-006
Displacement: 306.6 cm³/rev (18.71 in³/rev)
Mounting Flange: Standard 2-bolt; pilot Ø 82.6 mm
Output Shaft: 25.40 mm (1.000 in) straight shaft with 1/4-20 UNC thread, 6.35 mm woodruff key
Port Type: 7/8-14 UNF-2B SAE O-ring ports, staggered
Case Drain: 7/16-20 UNF-2B
Maximum Continuous Speed: 246 rpm
Maximum Flow Rate: 75 L/min
Control Type: Disc valve, fixed displacement
104-1065-006:
Model Number: 104-1065-006
Displacement: Approx. 200 cm³/rev (12.20 in³/rev)
Mounting Flange: SAE A 2-bolt
Output Shaft: 31.75 mm (1-1/4 in) keyed shaft
Port Type: 1-1/16-12 UN SAE O-ring ports, 180° apart
Maximum Continuous Pressure: Approx. 142 bar (2061 psi)
Maximum Continuous Torque: Approx. 400 N·m (3540 in-lb)
Maximum Continuous Speed: 375 rpm
Control Type: Disc valve, fixed displacement
104-1388-006:
Model Number: 104-1388-006
Displacement: 194.8 cm³/rev (11.89 in³/rev)
Mounting Flange: Standard 4-bolt; pilot Ø 82.6 mm
Output Shaft: 32 mm straight shaft, 10×8×45 mm key, M8×1.25 thread in end
Port Type: G 1/2 BSP straight thread ports, staggered
Case Drain: G 1/4 BSP
Maximum Continuous Speed: 385 rpm
Maximum Intermittent Speed: 577 rpm
Maximum Continuous Torque: 540 N·m
Maximum Intermittent Torque: 665 N·m
Maximum Continuous Pressure Drop: 205 bar
Maximum Intermittent Pressure Drop: 260 bar
Peak Pressure: 310 bar
Maximum Flow Rate: 75 L/min (intermittent 115 L/min)
Control Type: Disc valve, fixed displacement
Weight: Approx. 10.4 kg
Finish: Primer low gloss black
Key Technical Advantages
1. Industry-Leading Low Pressure Drop Geroler Gear Set
The 2000 Series features Eaton’s patented Geroler gear set with roller-tooth geometry that minimizes friction losses, making it one of the lowest pressure drop orbital motors in the industry. The 104-4114-006 and 104-1007-006 deliver approximately 765 N·m of rated torque at 246 rpm with a displacement of 306.6 cm³/rev.
2. True Drop-in Interchangeability
Flange bolt patterns, pilot diameters, shaft specifications, and port layouts are 1:1 identical to original Eaton Char-Lynn products. The 104-4114-006 features an SAE A 4-bolt flange while the 104-1388-006 utilizes G 1/2 BSP ports, covering both North American and European hydraulic interface standards.
3. Three-Zone Design for Bi-Directional Operation
The 2000 Series employs a three-zone design that extends motor life and enables true bi-directionality. The disc valve maintains stable volumetric efficiency and uniform torque output under elevated back-pressure conditions with minimal torque ripple.
4. Precision Spline and Bearing System
The 14-tooth involute spline shaft of the 104-4114-006 is surface-hardened for high tooth-contact strength, suitable for frequent start-stop cycling and alternating loads. Internal bearings meet the highest standards of the industry, maintaining stable radial load capacity under low-speed, heavy-duty conditions.
5. 100% Simulated-Condition Factory Testing
Every motor undergoes comprehensive hydraulic bench testing before shipment, verifying torque stability, rotational smoothness, and zero-leakage performance at rated pressure.
Application Areas
Agricultural Machinery: Combine harvesters, mowers, sprayer agitator drives
Construction Equipment: Compact excavator swing, skid steer attachment drives
Material Handling: Conveyor drives, winches, hoisting mechanisms
Municipal Equipment: Snow removal, street sweepers
Industrial Equipment: Machine tool feeds, winders, mixing equipment
The 104-4114-006 is particularly suited for harvesting equipment, brush cutters, and swing drive applications
Expert Maintenance Tips
System Cleanliness: Ensure hydraulic system cleanliness reaches NAS 8 or better before installation. The precision clearances of the Geroler gear set and disc valve are highly sensitive to particulate contamination.
SAE O-Ring Port Torque: Recommended tightening torque is 55–70 N·m for 7/8-14 UNF ports and 95–110 N·m for 1-1/16-12 UN ports. Use a calibrated torque wrench with new O-rings.
Initial Start-Up Bleeding: Run the motor at low pressure (< 5 MPa) with no load for 5–10 minutes before first operation to bleed trapped air.
Case Drain Line Configuration: When system back-pressure exceeds 2 MPa, a dedicated case drain line to the reservoir is mandatory. The 104-4114-006 uses a rear-facing 7/16-20 UNF SAE O-ring port; the 104-1388-006 uses a G 1/4 BSP port.
Hydraulic Oil Maintenance: Recommended oil viscosity is 20–40 cSt with an operating temperature range of -20°C to 80°C. Replace oil and filters every 1,000 operating hours or 6 months. The 104-1388-006 has a maximum flow rate of 75 L/min; exceeding this will cause cavitation and overheating.
