Product Overview
The 604-1265 is the flagship model in the Eaton/Char-Lynn 2K-195 Series of low-speed high-torque geroler hydraulic wheel motors, featuring a geometric displacement of 195 cm³/rev (11.9 in³/rev) with advanced disc valve distribution and roller-stator geometry. This model belongs to the Char-Lynn 2000 Series (2K Series) wheel motor configuration — the mounting flange is located near the center of the motor, allowing the motor to be partially or fully installed inside the wheel hub. When used for traction drives, the load is applied over the motor bearings to ensure maximum bearing life.
The 604-1265 is a direct drop-in replacement for Eaton/Char-Lynn 2K-195 Series OEM wheel motors, with fully interchangeable mounting flange, shaft, and port locations. It uses tapered roller bearing support for high radial load capacity, allowing the motor to directly drive the working mechanism. Every unit undergoes 100% simulated load-condition bench testing before shipment.
Series Model Notes: This batch covers multiple Char-Lynn series models spanning the 2000 Series, S Series, and H Series:
604-1265 / 604-1055: 2K-195 Series wheel motors, 195 cm³/rev, for traction drives and loader travel systems
103-2690-012: S Series spool valve motor, 165 cm³/rev, cast iron housing, for agricultural augers and food processing equipment
105-1376-006: 2000 Series medium-duty, matches Danfoss M02049AB03AA01, for combine harvesters and soil trenchers
101-1043-009: H Series spool valve motor, 5.9 in³/rev (96.7 cm³/rev), for mowers and agricultural spraying equipment
104-1026-006: 2000 Series disc valve motor, 194.8 cm³/rev, standard 2-bolt A flange, for mowers and harvesting equipment
Technical Specifications
604-1265 (2K-195 Wheel Motor)
Model: 604-1265 (Eaton/Char-Lynn 2K-195 Series)
Series: 2000 Series (2K Series) wheel motor configuration
Displacement: 195 cm³/rev (11.9 in³/rev)
Continuous Working Pressure: 20.5 MPa (205 bar)
Intermittent Working Pressure: 26 MPa (260 bar)
Peak Pressure: 31 MPa (310 bar)
Continuous Output Torque: 540 N·m
Intermittent Output Torque: 665 N·m
Max Continuous Speed: 385 rpm
Max Intermittent Speed: 577 rpm
Max Flow: 75 L/min
Control Type: Disc valve distribution; bidirectional rotation; speed infinitely adjustable via hydraulic flow
Mounting: Wheel motor flange (flange near motor center, allows installation inside wheel hub)
Bearing Type: Tapered roller bearings, high radial load capacity
Volumetric Efficiency: 88%
Overall Efficiency: 98%
Material: Cast iron housing
Weight: Approx. 17.9 kg (2K-195 Series reference)
Data source: 2K-195 604-1055 technical specification table (jdzj.com) and distributor technical data. Simultaneous operation at maximum speed and maximum pressure is not permitted. Intermittent pressure or speed is allowed for a maximum of 10% of each minute. Maximum operating oil temperature: 80°C.
604-1055 (2K-195 Wheel Motor)
Model: 604-1055 (Eaton/Char-Lynn 2K-195 Series)
Series: 2000 Series (2K Series) wheel motor configuration
Displacement: 195 cm³/rev (11.9 in³/rev)
Max Flow: 75 L/min
Max Continuous Speed: 385 rpm
Max Intermittent Speed: 577 rpm
Continuous Working Pressure: 20.5 MPa
Intermittent Working Pressure: 26 MPa
Peak Pressure: 31 MPa
Continuous Output Torque: 540 N·m
Intermittent Output Torque: 665 N·m
Control Type: Disc valve distribution; bidirectional rotation
Mounting: Wheel motor flange
Bearing Type: Tapered roller bearings
Material: Cast iron housing
Data source: 2K-195 Series technical specification table (jdzj.com). The 604-1055 and 604-1265 both belong to the 2K-195 Series with identical displacement; mounting configurations may differ slightly.
103-2690-012 (S Series Spool Valve Motor)
Model: 103-2690-012 (Eaton/Char-Lynn S Series)
Series: S Series (Spool Valve Motor)
Displacement: 165 cm³/rev (10.07 in³/rev)
Max Continuous Speed: 343 rpm @ 57 L/min
Max Flow: 57 L/min (15 gal/min)
Continuous Working Pressure: 1900 psi (131 bar)
Max Inlet Pressure: 2500 psi (172 bar)
Intermittent Max Pressure: 289 bar
Output Torque at Rated PSI: 301 N·m (2662 in-lb)
Mounting: 2-bolt, 82.55 mm (3.25 in) pilot diameter, 106.35 mm (4.187 in) bolt circle
Output Shaft: 25.4 mm (1 in) 6-tooth spline
Port Size: 1/2 in NPTF side ports
Case Drain: SAE-4
Control Type: Spool valve distribution
Material: Cast iron housing
Weight: Approx. 13.2 kg (29.0 lb)
Data source: Applied Industrial Technologies distributor technical data.
105-1376-006 (2000 Series)
Model: 105-1376-006 (Eaton/Char-Lynn 2000 Series)
Series: 2000 Series; medium-duty
Corresponding Danfoss Model: M02049AB03AA0100010000000ABAAF
Displacement: Reference 2000 Series 195 cm³/rev configuration (same displacement range as 604 Series)
Continuous Working Pressure: 205 bar
Max Flow: 75 L/min
Mounting: 2-bolt SAE A flange
Output Shaft: Straight keyed
Port Configuration: BSP side ports, parallel alignment
Control Type: Spool valve Geroler distribution
Material: Cast iron housing, black primer
Data source: hyhhydraulics distributor technical data.
101-1043-009 (H Series)
Model: 101-1043-009 (Eaton/Char-Lynn H Series)
Series: H Series (Spool Valve Motor)
Corresponding Danfoss Model: MH0059AA01AC0000000000000AA00J
Displacement: 5.9 in³/rev (96.7 cm³/rev)
Max Continuous Speed: 585 rpm @ 15 gal/min
Max Flow: 15 gal/min (57 L/min)
Continuous Working Pressure: 1800 psi (124 bar)
Max Inlet Pressure: 2500 psi (172 bar)
Output Torque at Rated PSI: 1368 in-lb (approx. 155 N·m)
Mounting: 2-bolt SAE-A, 3.25 in pilot diameter
Output Shaft: 1 in × 1/4 in straight with Woodruff key
Port Configuration: Manifold, 5/16-18 UNC side ports
Control Type: Spool valve distribution; three-zone pressure design
Bearing Type: Hydrodynamic journal bearings
Material: Cast iron housing
Case Drain: None required
Data source: Applied Industrial Technologies distributor technical data.
104-1026-006 (2000 Series)
Model: 104-1026-006 (Eaton/Char-Lynn 2000 Series)
Series: 2000 Series
Displacement: 194.8 cm³/rev (11.9 in³/rev)
Continuous Working Pressure: 3000 psi (207 bar)
Max Inlet Pressure: 4500 psi (310 bar)
Intermittent Max Pressure: 260 bar
Output Torque at Rated PSI: 4780 in-lb (approx. 540 N·m)
Max Continuous Speed: 385 rpm @ 20 gal/min
Max Flow: 75 L/min (20 gal/min)
Mounting: 2-bolt A flange, 3.25 in pilot diameter, 4.19 in bolt circle
Output Shaft: 1-1/4 in × 5/16 in straight keyed
Port Size: SAE-10 (7/8-14 UNF), side ports staggered
Case Drain: 0.4375-20 UNF-2B SAE O-ring port
Control Type: Disc valve distribution; bidirectional rotation
Material: Cast iron housing
Weight: Approx. 11.5 kg (25.35 lb)
Data source: Applied Industrial Technologies and Bailey Hydraulics distributor technical data.
Key Technical Advantages
1. Wheel Motor Configuration with Tapered Roller Bearings for High Radial Load Capacity
The 604-1265 and 604-1055 use a wheel motor flange design with the flange located near the center of the motor, allowing partial or full installation inside the wheel hub. When used for traction drives, the load is applied over the motor bearings to ensure maximum bearing life. The tapered roller bearing support provides high radial load capacity, allowing the motor to directly drive the working mechanism without additional support.
2. Disc Valve Distribution with Automatic Wear Compensation
The 2000 Series (604-1265, 604-1055, 105-1376-006, 104-1026-006) employs the signature Char-Lynn disc valve architecture — the two sealing faces of the valve plate maintain pressure balance, minimizing leakage. The wear-compensated valve plate maintains tight contact over extended service life, ensuring stable volumetric efficiency. The 2000 Series is officially described by Eaton as the “lowest pressure drop motor in the industry”.
3. Spool Valve Distribution with Three-Zone Pressure Design (S Series and H Series)
The 103-2690-012 (S Series) and 101-1043-009 (H Series) employ spool valve distribution. The H Series uses a three-zone pressure design that allows for increased shaft seal and bearing life. Hydrodynamic journal bearings optimized for long life distribute pressurized fluid via integrated valve slots into the Gerotor or Geroler orbit gear set.
4. High Power Density in a Compact Package
All series feature cast iron housings for excellent rigidity and durability. The 2000 Series delivers up to 540 N·m of continuous torque (604-1265, 104-1026-006) in a compact package, while the S Series (103-2690-012) delivers 301 N·m at 165 cm³/rev displacement. Standardized mounting flanges and multiple shaft options (keyed, splined) allow flexible adaptation across different drive requirements.
Application Areas
Loaders & Construction Equipment: Compact loader travel drives (604-1265, 604-1055), skid-steer loader travel systems
Agricultural Machinery: Combine harvester drives, soil trenchers, agricultural augers, seeders, mowers, agricultural spraying equipment
Industrial Equipment: Food processing equipment, machine tools, industrial sweepers and floor polishers
Material Handling: Conveyor drives, winch and hoist mechanisms
Municipal Equipment: Street sweeper drives, snow removal equipment
Expert Maintenance Tips
Installation Guidelines:
As a wheel motor, the 604-1265 should be installed with the load applied over the motor bearings to ensure maximum bearing life. Before installation, verify system oil cleanliness meets ISO 18/13 or better. Use premium anti-wear hydraulic oil with viscosity maintained at 37-73 cSt.
For the 2000 Series (104-1026-006, 105-1376-006), ensure the 2-bolt A flange and equipment interface surfaces are clean and flat during installation. Shaft alignment must be within 0.05mm using a flexible coupling.
The 103-2690-012 uses a 1-inch 6-tooth spline output shaft. Ensure proper fit clearance between the spline and the equipment-side internal spline to avoid wear from excessive looseness.
The 101-1043-009 is an H Series spool valve motor with no case drain port. No drain circuit is required during installation. Motors can be used in series or parallel — when used in series, an external drain line must be connected.
During initial commissioning for all models, run at no more than 30% of rated pressure for at least 30 minutes of no-load break-in.
Operational Maintenance:
Maximum operating oil temperature: 80°C. Monitor case temperature regularly; if abnormally high, prioritize checking internal wear or system internal leakage.
Use premium anti-wear hydraulic oil with viscosity maintained at 37-73 cSt. Oil cleanliness: ISO 18/13.
Inspect volumetric efficiency every 2,000 hours or every 12 months. If efficiency drops by more than 10% of rated value, disassemble and inspect the valve plate (2000 Series) or spool valve assembly (S/H Series) and Geroler set.
The H Series (101-1043-009) hydrodynamic journal bearings are designed for long life, but bearing clearance should be periodically inspected under continuous high-load conditions.
