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Hydraulic systems in wheat harvesters (combine harvesters) are vital for powering critical functions such as header control, reel adjustment, threshing, sieving, grain augering, and straw management. Below is a detailed breakdown of hydraulic products used in wheat harvesters, along with high-market-share brands and specific models:

1. Hydraulic Motors

Role: Drive the header, reel, grain augers, threshing rotor, and straw chopper.
Types:

    • Orbital Motors: Compact, low-speed/high-torque for precise control (e.g., auger drives).

    • Piston Motors: High-power for heavy-duty tasks like threshing and chopping.

High-Market-Share Models:

    • Danfoss OMM/OMV Series (e.g., OMM 160): Compact orbital motors for grain augers.

    • Eaton Char-Lynn 2000 Series (e.g., 211-1020): Robust motors for threshing rotors.

    • Parker Hannifin F11 Series: High-torque motors for header drives.

    • Bucher Hydraulics QXM Series: Piston motors for straw choppers.

2. Hydraulic Pumps

Role: Generate fluid flow to power motors and cylinders.
Types:

    • Gear Pumps: Cost-effective for mid-pressure systems (e.g., reel adjustment).

    • Piston Pumps: High-pressure for demanding tasks like threshing and rotor drives.

High-Market-Share Models:

    • Bosch Rexroth A10VO Series (e.g., A10VO 45): Axial piston pumps for combine harvesters.

    • Parker PGP Series (e.g., PGP505): Gear pumps for auxiliary systems.

    • Eaton 46 Series (e.g., 72456): Variable displacement pumps for adaptive power needs.

3. Hydraulic Cylinders

Role: Adjust header height, reel position, sieve settings, and grain tank covers.
Types:

    • Double-Acting Cylinders: Precision control for header height and reel adjustments.

    • Telescopic Cylinders: Extended reach for large headers.

High-Market-Share Models:

    • Parker Hannifin 2H/3H Series: Heavy-duty cylinders for header lift.

    • Eaton HSL Series (e.g., HSL-203): High-strength cylinders for sieve adjustments.

    • Wipro Hydraulics Custom Cylinders: Tailored for grain tank covers.

4. Hydraulic Control Valves

Role: Regulate flow direction, pressure, and speed for actuators.
Types:

    • Directional Control Valves: Manage header lift, auger start/stop.

    • Proportional Valves: Enable precise adjustments (e.g., reel speed).

High-Market-Share Models:

    • HydraForce SV08/SV10 Series: Compact solenoid valves for automated control.

    • Sun Hydraulics DGMP Series: Manual valves for simple systems.

    • Parker D1VW Series: Proportional valves for precision adjustments.

5. Hydraulic Hoses & Fittings

Role: Connect components in dusty, high-vibration environments.
Key Brands/Models:

    • Gates UltraFlex II Hoses: Abrasion-resistant for field use.

    • Parker Hannifin 429HT Hoses: High-temperature tolerance for harvesters.

    • Dixon Snap-Tite Couplers: Quick-disconnect fittings for maintenance.

6. Hydraulic Power Packs

Role: Compact units for standalone functions (e.g., straw choppers).
Key Models:

    • Hyvair HPU Series: Lightweight units for mobile applications.

    • Bailey Hydraulics Custom Power Packs: Integrated systems for large combines.

7. Hydraulic Filters & Reservoirs

Role: Maintain fluid cleanliness in dusty conditions.
Key Models:

    • Donaldson P550597: High-efficiency filters for combine harvesters.

    • Parker Hannifin Spin-On Filters: Easy replacement in harsh environments.

8. Hydraulic Manifolds

Role: Centralize valve mounting for compact, efficient systems.
Key Models:

    • Sun Hydraulics Custom Manifolds: Modular designs for complex circuits.

    • Bosch Rexroth HMB Series: Pre-engineered for agricultural machinery.

Top Brands in Wheat Harvester Hydraulics

    1. Eaton (Char-Lynn motors, HSL cylinders).

    2. Parker Hannifin (PGP pumps, 2H cylinders).

    3. Bosch Rexroth (A10VO pumps, HMB manifolds).

    4. Danfoss (OMM motors for compact systems).

    5. HydraForce (SV valves for precision control).

Example Hydraulic System in a Wheat Combine Harvester

    • Motor: Eaton Char-Lynn 211-1020 (threshing rotor drive).

    • Pump: Bosch Rexroth A10VO 45 (main hydraulic power).

    • Valve: HydraForce SV10-22 (header lift control).

    • Cylinder: Parker 2H Series (header height adjustment).

Key Considerations

    • Durability: Components must withstand dust, heat, and heavy loads.

    • Precision: Proportional valves and high-torque motors ensure accurate adjustments (e.g., sieve settings).

    • Integration: OEMs like John Deere, CLAAS, and New Holland use these components in their harvesters.

For specialized applications, manufacturers often customize hydraulic systems to match harvester size and operational demands (e.g., small vs. large headers).


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