104 Series Hydraulic Motor Eaton Danfoss 104-3279-006 104-1213-006 104-1027-006 104-1018-006 Orbit Motor

Wuhan Xinlaifu Hydraulic Equipment Co., Ltd. is one of the leading manufacturers and suppliers of 104 series hydraulic motor eaton danfoss 104-3279-006 104-1213-006 104-1027-006 104-1018-006 orbit motor in China. With abundant experience, we warmly welcome you to buy high quality customized products at competitive price from our factory. Also, OEM&ODM service is available.

 

Parameter	MCR03	MCR05	MCR10
Displacement	160–400 cc/rev	380–565 cc/rev	780–1340 cc/rev
Max Continuous Pressure	400 bar	400 bar	400 bar
Max Differential (Peak) Pressure	450 bar	450 bar	450 bar
Max Torque	4,200 N·m	9,500 N·m	18,000 N·m
Max Speed	310 rpm	190 rpm	130 rpm
Min Speed	0.5 rpm	0.5 rpm	0.5 rpm
Typical Application	1–4 t mini excavators, skid steer loaders	Mid-size excavators, wheel loaders	20–35 t excavators, heavy wheel drives

If you maintain equipment that relies on a low-speed, high-torque hydraulic motor - a skid steer loader, a brush cutter, a combine harvester, or a sweeper - you already know that the motor is not a generic component. It is the final drive. When it fails, the machine stops working.

The 104 series is the part number system for the Eaton Char-Lynn 2000 Series low-speed, high-torque (LSHT) Geroler disc valve motor. This product line is now part of the Danfoss portfolio, following Eaton's divestiture of its hydraulics business. Whether your machine's parts manual lists the original Eaton part number or a newer Danfoss model code, the 104 series identifies the correct motor for your application.

What makes the 2000 Series different?

The 2000 Series uses a Geroler gear set with a disc valve distribution system. A hardened steel gear rotates inside a stationary ring, and the disc valve distributes hydraulic pressure to the geroler chambers in sequence. This architecture delivers high starting torque and smooth rotation at very low speeds - without the need for a gearbox.

The motor also features the lowest pressure drop in the industry for its class, which translates directly to energy savings and less heat generation in the hydraulic system. The cast iron housing and sealed design make it suitable for dusty, high-vibration mobile equipment environments.

Which 104 series motor do you need? That depends on three questions:

What is your machine's required drive torque? → determines the displacement (158 cc/rev, 244 cc/rev, or other sizes within the 2000 Series)

How is the motor mounted on your machine? → standard 2-bolt, wheel mount, or bearingless configuration

What shaft and port configuration does your machine use? → splined or keyed shaft; SAE O-ring ports

2.1 Displacement Selection – Match the Motor to Your Torque Requirement

The 104 series covers a range of displacements within the 2000 Series platform. Three of the most commonly specified models are:

104-3279-006: This model is also part of the 2000 Series platform. Publicly available cross-reference data for this specific part number is limited - the displacement and torque rating should be confirmed against your machine's original motor nameplate or the Eaton PowerSource database before ordering.

Selection rule of thumb: Calculate the required drive torque at the output shaft under worst-case conditions - full bucket, maximum cut, or steep grade. Compare to the rated torque of each displacement. If the required torque exceeds the rated value for a given displacement, step up to the next larger size.

Critical warning: The four part numbers listed on this page are not interchangeable. Each corresponds to a specific displacement, mounting configuration, and shaft type. Installing a motor with the wrong displacement will change machine speed and torque characteristics - potentially overloading the hydraulic system or underperforming the application.

2.2 Geroler Disc Valve Design – High Starting Torque, Smooth Low-Speed Operation

The 2000 Series uses a Geroler (generated rotor) gear set - a precision-machined rotor that orbits within a stationary ring. Rollers between the rotor and ring reduce friction and allow the motor to start smoothly under full load.

What this means for your application:

High starting torque - the motor develops significant torque immediately on startup, without the "dead band" that affects some vane and piston motor designs

Smooth low-speed rotation - the motor runs without stick-slip at speeds as low as a few rpm, which is essential for auger drives, winch positioning, and sweeper brush control

High volumetric efficiency - the Geroler geometry maintains a tight seal between the rotor, rollers, and ring, minimizing internal leakage

The disc valve distribution system provides a large flow area with minimal pressure drop. Eaton specifies this as the lowest pressure drop motor in the industry for its class. Lower pressure drop means less energy wasted as heat, and more of your hydraulic power goes to doing useful work.

2.3 Mounting Configurations – Standard, Wheel, and Bearingless

The 2000 Series is available in three mounting configurations. Choosing the correct one is essential for drop-in replacement.

Standard Mount (2-Bolt Flange)

The most common configuration. A 2-bolt flange with SAE A pilot diameter (82.6 mm) and 106.4 mm bolt circle mounts the motor to a bracket or machine frame. The output shaft drives through a coupling to the driven component. This is the standard configuration for sweepers, winches, and conveyor drives.

Wheel Mount (with Integrated Bearing)

The motor includes an integrated wheel flange and bearing that allows a standard wheel rim to be bolted directly to the motor. This eliminates the need for a separate wheel hub and bearing assembly. Used on skid steer loaders, compact wheel loaders, and turf equipment.

Bearingless Configuration

The motor is supplied without output bearings, for applications where the driven component provides its own bearing support. This configuration is used in direct-drive auger and brush applications where the motor shaft connects directly to the tool.

How to identify your configuration: Check the original motor's mounting flange. A standard mount has a 2-bolt flange with a pilot boss. A wheel mount has a larger flange with threaded wheel studs protruding. A bearingless motor has no flange bearing - the output shaft is supported only by the geroler section.

2.4 Shaft and Port Options – Match Your Existing Coupling

The 104 series motors are available with multiple shaft and port configurations:

Before ordering a replacement motor: Confirm the shaft type and port size from your original motor. A motor with the correct displacement but the wrong shaft will not couple to your existing drive.

2.5 Eaton to Danfoss – Brand Transition and Part Number Mapping

The Eaton Char-Lynn hydraulics business was acquired by Danfoss. The 104 series part numbers remain valid, but Danfoss has introduced a parallel M-series model code system for new production.

What this means for you: When searching for a replacement, use the 104 part number from your original motor's nameplate. If you are ordering a new-production unit from Danfoss inventory, the distributor will cross-reference to the M-series code. Both identify the same motor - the 104 number is the legacy Eaton identifier, and the M-series is the current Danfoss identifier.

2.6 Broad Application Coverage – One Platform, Many Machines

The 2000 Series is one of the most widely deployed LSHT motor platforms in mobile hydraulics. Common applications include:

 A2VK Series Axial Piston Metering Pump (Polyurethane High Pressure Variable Pump) A2VK series is a high-precision axial piston variable metering pump, specially designed for polyurethane foaming machinery, used for precise proportional delivery of polyol and isocyanate. Equipped with integrated handwheel with precision scale, stepless adjustment of displacement. Double shaft seal structure with buffer fluid port, suitable for chemical medium, low pulsation, high volumetric efficiency, stable metering performance. Widely used in PU high-pressure foaming injection system, chemical proportioning metering system.

A2VK □ □ □ □ □ - S02

1. Size:12/28/55/107
2. Control: MA = Manual handwheel adjustment
3. Rotation: R=Clockwise, L=Counter-clockwise
4. Seal / Material: G=Standard seal for PU medium
5. Port: P=SAE threaded port

Hot Tags: 104 series hydraulic motor eaton danfoss 104-3279-006 104-1213-006 104-1027-006 104-1018-006 orbit motor, China 104 series hydraulic motor eaton danfoss 104-3279-006 104-1213-006 104-1027-006 104-1018-006 orbit motor manufacturers, suppliers