The AVSpare 824 Tractor may be equipped with either one of two tire groups known as "off-road" tires which are as follows:
- 1. Traction Type Tire: The traction type tire is a self-cleaning directional bar type tire and is used for maximum traction in soft terrain.
- 2. Rock Type Tire: The rock type tire is used when operating in strip mines, quarries, or where chipping, cutting and heavy abrasives are found.
The standard tires used on this tractor are 26.5 x 29, 22 ply rock or traction tubeless tires.
Optional tires available for this tractor are: 29.5 x 29, 22 ply rock, traction or rock extra tread tubeless tires.
Factors Affecting Tire Service Life: The ordinary hours of service that are built into the tires may be obtained or greatly extended if proper care and maintenance are given them. Tire Ratings and Usage, Tire Inflation, Tire and Rim Care, Tire Removal and Tire Installation are some of the factors affecting tire service life which should be understood in order to give the care and maintenance that is required.
Tire Ratings and Usage
Tire Rating: Tires are rated as to recommended load carrying capacity, inflation pressure, and speed. These three factors are so related that they cannot be considered individually. Therefore a specific tire has been selected to match this particular machine.
Speed: The rate of speed at which the tire must travel is an important factor in tire service life. Speeds encountered on the job affect the heat build-up in the tire casing.
Haul Road Condition: The condition of the ground over which the tractor travels is important if full tire service is to be obtained. Chuck holes, depression, sharp rocks, boulders and snags cause abnormal wear to the equipment as well as damage to the tires.
If a motor grader is not available for road maintenance, it is sometimes profitable to clear the road by hand.
Inspection and Repair: Keep valve caps on to prevent dirt getting in the valve. Replace the valve core when it first develops a leak. Wipe off any oil or grease which may be on the tires. Inspect the tires daily for cuts, breaks or sharp objects which might work into the casing. Remove all foreign material. Repair at once all deep cuts which have penetrated into the cord body. Where a number of small cuts and snags have accumulated, the tire should be removed and repaired as soon as possible.
For long trouble free service, tires should be correctly inflated for a given load at a given speed. The illustration shows the comparison of tire shapes assumed due to differences of inflation.
The properly inflated tire (A) cushions the shock loads and allows all of the tread area to contact the surface.
Underinflation (B) causes excessive strain on the tire, uneven tread wear, and greater flexing, which results in cord fatigue and breakage.
The overinflated tire (C) will not cushion shock and results in less ground contact area. Wear is uneven and tire body is in greater tension.
COMPARISON OF TIRE SHAPES
A-Correctly inflated tire. B-Underinflated tire. C-Overinflated tire.
For average operating conditions, inflate tires when cold to the pressure shown in the TIRE INFLATION CHART.
CORRECT POSITION FOR INFLATING TIRE
For safe tire inflation self-attaching air chucks are recommended. An air chuck that can be fastened to the tire valve will enable tire inflations to be accomplished from behind the tread of the tire.
Tire and Rim Care
Tires: Proper handling and correct procedure in mounting, servicing and maintenance are essential to obtain all the advantages of tubeless tires. The following information has been prepared for this purpose.
- 1. Tires should be stored and transported in a vertical position. Horizontal storing may make initial inflation difficult.
- 2. Do not lift tire by the beads with hooks or forks unless forks are saddle type construction. Sharp hooks or forks may tear, cut or snag the tubeless tires beads and result in leaks at these points when mounted. The beads should be protected and tire handled with a chain or rope around the outside.
- 3. Any foreign material or moisture should be removed from inside the tire.
Rims: Tubeless tire rims perform an important function as part of the assembly air seal. Proper care must be taken not to distort or mutilate the rim parts because they must mate properly to form part of the basic air chamber. For proper rim care see steps 1 through 7 as follows:
- 1. Never lift the rim using the valve hole.
- 2. Never drop, tumble, or roll rim parts.
- 3. If rim parts are to be stored outside in the weather, it is recommended they be given a protective coat of good commercial primer paint.
- 4. Like parts should be stacked neatly to prevent distortion.
- 5. Babbitt or lead hammers should be used in assembling rims instead of steel hammers.
- 6. O-ring seals for tubeless tires should be carefully stored in a cool, dry place and where they will not become damaged.
- 7. Valves should be stored in a cool, dry and clean place.
Tire removal may be accomplished with the wheel either on or off the machine. Install the safety rod. See the topic SAFETY ROD.
- 1. Block the tractor securely by placing blocking under the axle housing. Place adequate blocking in front of and behind the tires that remain on the ground to prevent the tractor from rolling.
- 2. Before attempting to remove a tire, completely deflate the tire by removing the valve core.
- 3. Loosen the tire outer bead from the bead seat band by using a 9F5194 Hydraulic Tubeless Tire Tool. See your AVSpare dealer to obtain this tool.
1-Driver. 2-Lock ring. 3-O-ring seal. 4-Bead seat band. 5-Outer flange.
- 4. After the tire outer bead is loose, remove the driver (1), lock ring (2), O-ring seal (3), bead seat band (4) and the outer flange (5).
- 5. Loosen the tire inner bead from the rim using the 9F5194 Hydraulic Tubeless Tire Tool.
- 6. Lift the tire from the rim, using a hoist and chain or rope sling.
This topic covers tire installation with the wheel on the machine. However, the tire may be installed in a similar manner by removing the wheel.
Clean dirt and corrosion from all rim parts and particularly in the groove and adjacent to the groove where the O-ring seal seats. If excessive corrosion exists, paint the rim base and rim parts with a good anti-corrosive paint.
- 1. With the seal (4) in place, insert the valve core housing (3) into the hole in the edge of the rim and tighten to 70 to 80 pounds inches (.80 to .92 m-kg).
- 2. Install the valve core (2) and valve cap (1).
1-Valve cap. 2-Valve core. 3-Valve core housing. 4-Seal.
- 1. Place the inner flange (2) on the rim making sure the lug on the flange is aligned with the notch (1) in the rim.
- 2. Using a hoist and chain or rope sling, place the tire on the rim. Tires having a directional tread, such as traction type, must be installed with the arrow on the tire pointing in the direction of forward rotation of the wheel.
- 3. Place the outer flange and the bead seat band on the tire and rim, making sure that the notch (4) in the bead seat band is aligned with the lug (5) on the flange as shown.
1-Notch. 2-Inner flange.
3-Notch. 4-Notch. 5-Lug.
- 4. Install the O-ring seal, lock ring, and driver on the rim with the ends of the lock ring positioned behind the driver which engages with notch (3) in the bead seat band.
- 5. Lubricate the O-ring seal with a thin solution of high grade soap flakes and water or equivalent (do not use a soap with mineral or chemical base).
- 6. Inflate the tire to 75 PSI pressure to assure proper seating of the tire beads, then adjust to the correct pressure. See the WARNING in the topic, TIRE INFLATION.
When inflating a tire in the horizontal position it may be necessary to lift the tire upward to effect a seal between the bead seat band and the O-ring in the rim base.