104-1028-006 Char-Lynn Eaton 2000 Series Orbital Motor 306.6cc

Product Overview:

The 104-3938-006, 104-1028-006, 104-1391-006, 104-1228-006 and 104-3054-006 models belong to the Danfoss (formerly Eaton Char-Lynn) 2000 Series disc-valve Geroler low-speed high-torque orbital motors. These motors feature a precision Geroler star and disc-valve distribution system that delivers high volumetric efficiency, true bi-directional performance and low pressure drop. Our units are manufactured to exact original dimensions, mounting interfaces, shaft ends and performance parameters, guaranteeing full interchangeability with genuine Char-Lynn / Eaton / Danfoss 2000 Series motors. Every motor undergoes 100% simulated operating-condition testing for pressure, speed, torque and leakage, ensuring reliable performance in demanding mobile and industrial applications.

Technical Specifications 

• Model: 104-1028-006 (2000 Series Standard, reference Model Code similar to M02187AC02AA0100010000000AAAAF)
• Geometric displacement: 306.6 cm³/r (18.71 in³/r)
• Continuous pressure drop: approx. 205 bar (up to ~3000 psi continuous per series data)
• Peak / intermittent pressure: up to approx. 240–310 bar (duty and displacement dependent)
• Maximum continuous speed: 246 rpm (at continuous flow ~75 L/min)
• Maximum intermittent speed: approx. 365 rpm
• Continuous torque: approx. 765 Nm
• Intermittent torque: approx. 885 Nm
• Valve system: Disc valve with valve drive
• Orbital gear set: Geroler
• Mounting flange: 2 Bolt SAE A (pilot 82.6 mm, bolt circle 106.4 mm)
• Output shaft: 1-1/4″ straight keyed (5/16″ key)
• Main ports: 7/8-14 UNF-2B SAE O-Ring, side staggered
• Drain port: 7/16-20 UNF-2B SAE O-Ring
• Bearings: Tapered roller bearings
• Seal: Standard NBR (high-pressure shaft seal option on some variants)
• Weight: approx. 12–14 kg (configuration dependent)

Related model reference data (official/series verified):

• 104-3938-006: displacement 194.8 cm³/r (11.89 in³/r), SAE A 2-bolt, 1-1/4″ 14-tooth spline shaft, high-pressure shaft seal option
• 104-1391-006: displacement approx. 393.8–395 cm³/r, continuous speed 191 rpm, continuous torque 775 Nm, continuous pressure drop approx. 155 bar
• 104-1228-006: displacement 393.8 cm³/r (24.03 in³/r), continuous speed 191 rpm, continuous torque 775 Nm, continuous pressure approx. 155 bar / 2250 psi, 2-bolt SAE A, 1-1/4″ straight keyed shaft
• 104-3054-006: 2000 Series configuration variant with matching series parameters and full interchangeability

Key Technical Advantages:

1. Precision Geroler star and disc-valve distribution: High-accuracy machining and wear-resistant materials deliver excellent volumetric efficiency, high starting torque at low speed and symmetrical bi-directional performance with industry-leading low pressure drop.
2. Heavy-duty tapered roller bearings and robust cast-iron housing: Capable of high radial and axial loads, ideal for direct-drive or heavy-duty applications, significantly extending bearing and seal life.
3. Full interchangeability with 100% duty-cycle testing: Exact match to original mounting dimensions, shaft ends, ports and performance curves for drop-in replacement; every unit is pressure-, speed-, torque- and leakage-tested under simulated conditions.
4. Low-noise, long-life design: Optimized flow paths and distribution accuracy reduce hydraulic pulsation and noise; standard NBR seals (high-pressure options on selected models) suit wide temperature ranges and various hydraulic fluids.

Application Areas:

Agricultural machinery (combine reel drives, feed augers, spreaders), construction equipment (street sweepers, auxiliary drives, pavers), forestry and turf equipment (mowers, brush cutters), material handling and industrial systems (conveyors, winches, swing drives) — any low-speed, high-torque direct-drive application.

Expert Maintenance Tips:

Ensure oil cleanliness (ISO 4406 20/18/13 or better) before installation. Correctly connect the case drain and keep case pressure within recommended limits. Start at low speed under no load and check for leaks or abnormal noise. Periodically replace shaft seals and inspect bearing preload; avoid prolonged operation beyond intermittent ratings. Use verified seal kits (e.g., 61258-000 series) during overhaul. Pair with proper filtration and cooling for maximum service life.