Types of Gearboxes Used in Tractors
The gearboxes used in tractors are sliding mesh, constant mesh, and synchromesh.
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Sliding Mesh Gearbox
- Oldest and simplest type
- Gears arranged on main and counter shafts mesh at a time to transmit torque
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Constant Mesh Gearbox
- Gears always in mesh, allowing speed changes without engaging or disengaging
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Synchromesh Gearbox
- Allows smooth engagement by synchronizing shaft speeds before gears are meshed
Bevel Gearboxes in Tractors
- Bevel Gearboxes
- Help reduce stress on tools by extending service life
- Key for efficient harvester operation
- Double-helix bevel gearbox is typically less than half size of a standard one
Transmission Types in Tractors
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Manual Transmissions
- Have discrete ratios combined with throttle to allow speeds under 25 mph
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Power Shift Transmissions
- Shift gears without clutching using multi-plate wet clutch packs
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Hydrostatic Transmissions
- Use hydraulic fluid to power drive gears and axles
Differential in Tractors
- Differential
- Consists of a planetary gear system with bevel gears
- Keeps the tractor moving at a constant rate while allowing wheel speed differences
Tractor Operations
- Tractors pull various implements for plowing, planting, harvesting, and hauling
- The engine powers implements through the power take-off shaft or belt pulley
- Main functions include pulling equipment and powering machinery