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Section 3 - Operation
Tire Selection
Factors Determining Best Tire Performance
Good Performance
• Proper air pressure for the load
• Proper sidewall deflection
• 8%-15% wheel slip
• Proper tire size for expected load
• Less than 50% fill of liquid ballast
• Maintaining equal tire pressure in all tires on a
given axle
Poor Performance
• High or low air pressure
•
Stiff sidewalls
• High or low wheel slip
• Overloaded or underloaded tire
• Treating tires on an axle differently
.
Refer to “Ballasting” later in this section for proper
tractor weight procedures once the tire size has been
selected.
Tire Configurations
Tire Selection
Selecting the proper size and type of tires is important
in achieving maximum tractor efficiency. Various sizes
and types of tires are available for your tractor. Refer
to table below for approved tire sizes and articulation
block configurations for your tractor.
NOTE: If a specific size of tire or tire configuration is
not listed under a particular model, do not attempt to
install that size tire.
The tires selected for your tractor must be able to
support the weight of the tractor and equipment.
The tires must also be able to provide adequate tire
traction to utilize the tractor engine horsepower and
turn it into useful drawbar horsepower.
You will have to adjust the ballast, tire pressure and
tractor weight split between the front and rear axles
for various loads and conditions to achieve the best
ride and performance.
Always maintain the proper air pressure in the tire to
carry the load. Do not over inflate radial or bias ply
tires. Radial tires will work with LOWER air pressures.
Radial tires will show up to 20% sidewall deflection or
bulge when properly inflated.
The force that enables the tires to drive the tractor
must be transmitted through the tire sidewalls. The
tires work best when all the tires on a given axle are
working at the same rate.
Think of them like a shock absorber; they must respond
the same way to share the load equally.
Tire Size
Articulation blocks
Duals Triples
20.8R42 R1W None 38 deg
520/85/42 R1W
None 38 deg
520/85R46 R1W
None 38 deg
620/70R42 R1W
None 33 deg
650/65R42 R1W
None 33 deg
650/85R38 R1W
None 33 deg
710/70R38 R1W
None N/A
710/70R42 R1W
None N/A
800/70R38 R1W
38 deg N/A
850/60R38 38 deg N/A
900/50R42 R1W
38 deg N/A