Tillage Bearings

Soil preparation aims to provide best possible growing conditions in preparing a seedbed for crops by mechanical agitation of soil while at the same time preventing soil erosion and damage.

Optimal soil conditions are defined by parameters such as soil density, size of soil particles and crop residue left on the field. Significant for all tillage procedures is to optimize the balance of moisture and air throughout the soil. Primary tillage is the first operation after the last harvest, and is the most aggressive tillage operation intended to mix and reduce the size of residual crop decomposition over the winter.

Secondary tillage is typically performed in the following spring and is intended to reduce clod sizes, mix in crop residues and level the soil in preparation for seeding. Different set designs of disc harrows and cultivators are used to achieve this optimal soil condition.

Gangs of rotating discs or independent discs with varying diameter, concavity, and design break up the soil. Often this machinery is combined with a seedbed finisher like a rolling basket to reduce clod size and improve the evenness of the seedbed.

Application Challenges

The typical bearing speed of disc harrow tillage application is between 100 and 150 min-1. The bearings supporting these tillage discs essentially operate at or even partially below ground level. Moist or dry, abrasive contamination forcefully pushes against bearing faces and seals during operation.

Bearings are exposed to shock and high moment loads due to angle of pull. They typically need to be replaced as a result of excessive internal wear due to contamination. High sealing technology is crucial.

Gang disc application conditions

  • Utilizes two to three support bearings on a common shaft with several disks spaced with spools
  • Constant and unpredictable movement of the gang shaft can generate severe stress on the internal components of the support bearings
  • A great working depth places the bearings directly into the flow of soil and crop residue
PEER proven engineered system solutions

Tillage Trunnion Unit (TTU)
One of the most commonly used gang disc bearing arrangements is the trunnion housing.

Benefits and functional features

  • Bolt-on-performance:

    • Directly interchangeable industry standard units
    • Static misalignment capability accommodates imprecise mounting surfaces

  • Increased productivity and bearing life in field:

    • Dynamic misalignment capability eliminates internal bearing damage
    • Shock load protection due to high grade ductile iron housing
    • Exclusive patented sealing system eliminates the need for daily relubrication

  • Increased speed to market:

    • PEER offers the industry’s largest range for common round and square bore sizes feature package with seals

Independent disc application conditions

  • Utilizes two bearing assemblies
  • High misalignment from imprecise mounting and wide bearing spread attachments can generate severe stress on the internal components
  • Exposed directly into the fl ow of soil and crop residue
PEER proven engineered system solutions

Tillage HUB Units
Another commonly used bearing arrangement is the HUB unit.

Benefits and functional features

  • Bolt-on-performance:

    • The integrated flange design replaces an external housing
    • Reduces labor cost and eliminates damage due to incorrect assembly

  • Increased productivity and operation life in field:

    • Shock load protection from forged steel integrated flange
    • Eliminate internal bearing damage
    • Exclusive patented sealing system eliminates the need for daily relubrication

Seedbed finisher application conditions

  • Utilizes one bearing assembly for each disc
  • High loads and constant unpredictable movement of the disc can generate severe stress on the internal components
  • A great working depth places the bearings directly into the fl ow of soil and crop residue
PEER proven engineered system solutions

Tillage flanged disc units (FD and RFD), Mounted units (UCF and UCFT)
The most commonly used attachment bearing arrangements on a seedbed finishing tool are the FD and RFD units (flanged disc units), UCF and UCFT (mounted units).

FD and RFD units (flanged disc units) Benefits and functional features

  • Bolt-on-performance:

    • Directly interchangeable industry standard units
    • Static misalignment capability accommodates imprecise mounting surfaces

  • Increased productivity and bearing life in field:

    • Dynamic misalignment capability eliminates internal bearing damage
    • Shock load protection due to high grade ductile iron housing
    • Exclusive patented sealing system eliminates the need for daily relubrication

  • Increased speed to market:

    • PEER offers the industry’s largest range for common round and square bore sizes feature package with seals

Mounted units (UCF and UCFT) Benefits and functional features

  • Bolt-on-performance:

    • Directly interchangeable industry standard units
    • Compensates misalignment from imprecise mounting or frame surfaces

  • Increased productivity and bearing life in field due to:

    • Shock load protection due to high grade ductile iron housing
    • Exclusive sealing system eliminates the need for daily relubrication

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