104-1029-006 Char-Lynn 2000 Series LSHT Orbit Motor

Product Overview

The 104-3938-006, 104-1029-006, 104-1022-006 and 104-1228-006 belong to the Eaton Char-Lynn (now Danfoss) 2000 Series low-speed high-torque (LSHT) disc-valve orbital hydraulic motors. Featuring a precision Geroler gear set with disc-valve architecture, these motors are engineered for medium-to-high torque, high-flow and mobile/industrial applications. They deliver high starting torque, smooth low-speed operation, excellent radial load capacity and high volumetric efficiency. Fully interchangeable with original Char-Lynn / Danfoss 2000 Series units, they are validated under simulated operating conditions for reliable performance in construction, agricultural and industrial drive systems.

Technical Specifications 

• Models: 104-1029-006 / 104-3938-006 / 104-1022-006 / 104-1228-006 (Char-Lynn / Danfoss 2000 Series)
• 104-1029-006 Geometric Displacement: 4.92 in³/rev (approx. 80.6 cm³/rev)
• 104-3938-006 Geometric Displacement: 11.89 in³/rev (approx. 194.8 cm³/rev)
• Continuous Maximum Flow: 75 L/min (20 gpm)
• Continuous Maximum Speed (104-1029): 576 rpm
• Intermittent Maximum Pressure Drop: 310 bar
• Control Type: Disc-valve-driven Geroler orbital motor
• Mounting Flange: SAE A 2-bolt, 82.6 mm (3.25 in) pilot diameter
• Output Shaft Example: 1-1/4 in 14-tooth spline
• Ports: 7/8-14 UNF-2B SAE O-ring staggered side ports
• Case Drain: 0.4375-20 UNF-2B SAE O-ring
• Approximate Weight: 9.5–12 kg (displacement and configuration dependent)

Key Technical Advantages:

1. Precision Geroler gear set combined with disc-valve design minimizes internal leakage, maintaining high volumetric and mechanical efficiency even at elevated flow rates.
2. Three-zone pressure design (inlet, return and case) delivers true bi-directional performance and extended service life.
3. High starting torque and smooth operation across the full speed range make the motors well-suited for frequent start-stop, low-speed high-load and reversing duty cycles.
4. Quality bearings and cast-iron housing provide superior radial load capacity and pressure resistance for continuous and intermittent high-pressure operation.
5. Modular configuration options (displacement, flange, shaft, ports) facilitate system integration and full drop-in interchangeability, reducing downtime and replacement costs.

Application Areas:

Construction machinery (drive or swing functions), agricultural equipment, material handling and lifting systems, winches, snow removal equipment, wood products machinery, and other mobile or stationary hydraulic systems requiring high torque at low to medium speeds.

Expert Maintenance Tips:

Ensure precise flange alignment and respect radial load limits during installation. Use anti-wear hydraulic oil meeting ISO cleanliness code 18/13. Fully bleed the system and run at light load for initial break-in. Regularly inspect the shaft seal, case drain and fluid condition. Intermittent and peak pressure ratings are for short-duration use only (intermittent max 10% of each minute). In case of unusual noise, vibration or torque loss, first check system contamination, fluid condition and bearing status. Use genuine Char-Lynn / Danfoss seal kits for service to preserve original performance.