Meyer SXI 720, Owner/Operator’S Manual & Parts Book, Page: 47 / 132

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8.4.3 Tire Inflation
Inflation pressures should be checked at least every week. Recommended inflation pressures based on total load on tires
should be used. For accurate inflation use a special low-pressure gauge with one-pound gradations. Gauges should be
checked occasionally for accuracy. Always use sealing valve caps to prevent loss of air.
8.4.4 Implement Tires
Agricultural tires are designed to carry a specified load at a specified inflation pressure when mounted on a specified
width rim. When these conditions are met, the deflection of the tire carcass is in the optimum range and maximum tire
performance can be expected. If this combination of design factors is altered for any reason, tire performance will be
reduced.
Tire Overload or Under Inflation
Tire overload or under inflation have the same effect of over-deflecting the tire. Under such conditions the tread on the tire
will wear rapidly and unevenly, particularly in the shoulder area. Radial cracking in the upper sidewall area will be a
problem. With under inflated drive tires in high torque applications sidewall buckles will develop leading to carcass breaks
in the sidewall. While an under inflated drive tire may pull better in some soil conditions, this is not generally true and not
worth the high risk of tire damage that such an operation invites.
Over Inflation
Over inflation results in an under-deflected tire carcass. The tread is more rounded, concentrates tread wear at the
centerline area. Traction is reduced in high torque service because ground contact of the tread shoulder area is reduced
and the harder carcass, with reduced flexing characteristics, does not work as efficiently. The tightly stretched
overinflated carcass is more subject to weather checking and impact break damage.
Pressure Adjustments Required - Slow Speed Operation
Higher tire loads are approved for intermittent service operations at reduced speed. Under such conditions inflation
pressure must be increased to reduce tire deflection and assure full tire service life. See 8.4.3 Tire Inflation for proper
inflation.
Use of Proper Width Rims
If tires are mounted on rims of incorrect width, the following conditions can result:
• Use of a wider rim results in flattening of the tread face. This feature may improve traction in loose soil conditions. In
hard soils, however, the flatter tread penetrates less effectively and tractive effort is reduced. Additional stresses
concentrated in the shoulder area tend to increase the rate of shoulder tread wear. By spacing the tire beads farther
apart the sidewalls are forced to flex in an area lower than normal and this can result in circumferential carcass breaks
and/or separation.
• Use of a narrower rim brings potential mounting problems because the rim shield or flange cover molded into most
drive tire designs tends to interfere with the seating of the tire beads on a narrow rim. Once mounted on a narrow rim,
the tire shield applies undue pressure on the rim flange, with possible tire sidewall separation or premature rim failure
at the heel radius. On a narrow rim the tread of the tire is rounded. As with the over-inflated tire tread wear will be
concentrated in the center area of the tread and traction in the field will be reduced.
TIRE SIZE PSI
21.5L-16.1 44 If tires are to operate for any length of time on roads or other hard
surfaces and the draft load is not great, it is advisable to increase the
pressure in the tire to the maximum recommendation in order to
reduce the movement of the tread bars that causes excessive wiping
action.
28L-26 28
425/65 x 22.5 75
550/45 x 22.5 58
600/50 x 22.5 70