These maintenance instructions contain essential information regarding inflation pressure and other preventive maintenance inspection procedures. Careful attention to these instructions by the operator and maintenance personnel, will add much to safety, economy and life of the tire.
The AVSpare Beadless Tire has five major components: Carcass, mounting belt, two piece rim, steel shoes and adapter.
The carcass is the air chamber which mounts on the rim and supports the mounting belt.
The mounting belt is a rubber belt, with steel cable molded in the rubber. The belt also contains molded-in anchor plates to which the steel shoes are bolted. The mounting belt is removable for replacement. Your AVSpare dealer is equipped with the necessary tools and personnel familiar with disassembly and assembly procedures to replace the belt.
The rim is a two piece design with the two sections identical and bolted together to form the complete rim.
The steel shoes bolt directly to the anchor plates molded into the mounting belt. Individual shoes can be replaced separately.
The adapter allows the machine to be equipped with either the conventional tire or the AVSpare Beadless Tire. It enables users to convert existing machines (Serial No. 25K699 and Up) to the AVSpare Beadless Tire.
AVSpare BEADLESS TIRE WITH STEEL SHOES
Check tire pressure weekly. The recommended inflation pressure is 120 PSI, (8.5 kg/cm2) (827.4 kPa) cold. Use this pressure for all working conditions. The pressure reading should be taken only when the machine has been setting long enough for the temperature of the tire to equal ambient temperature. Keep valve caps on to prevent dirt getting into the valve.
Do not inflate the tire carcass above 2 PSI (0.4 kg/cm2) (14 kPa) without approved rims and belts in place, or internal damage or carcass rupture may occur.
Do not remove the valve core from an inflated tire except with the special valve core tool (5P161). Do not remove the strainer assembly or the plug while there is air in the carcass.
Shoe and Mounting Bolt Maintenance Inspection
It is very important that the bolts which hold the shoes to the anchor plates on the mounting belt are kept tight. Loose or missing shoes can cause damage beyond repair to the mounting belt. Inspect weekly for loose or missing bolts. Replace loose, broken or missing bolts and tapping blocks immediately. Keep shoe bolts tightened to 350 ± 50 lb. ft. (48.4 ± 6.9 mkg.) plus 1/3 turn.
If a bolt is loose or missing, the shoe must be removed. Inspect tapping blocks and mounting bolts and replace with new ones if they are damaged.
When installing the shoe, make sure all mating surfaces are clean so correct torque on mounting bolts can be maintained. Oil mounting bolts and tapping blocks before installing.
Check track shoe grouser height monthly. New grouser height is 1.75" (44,5 mm). Grousers tend to wear more at the ends than in the center of the shoe. When grousers measure 1.00" (25,5 mm) at the center of the shoes, either rebuild or replace. Allowing grousers to wear beyond this limit can cause track shoe and/or bolt breakage. Shoe must be flat within .088" (2,2 mm) after rebuild (parallel lengthwise to grouser).
Remove shoes before rebuilding to prevent damage to the rubber belt from welding (heat and weld splatter).
Tighten the shoe bolts in a diagonal sequence pattern using the following procedure.
- 1. Tighten the bolts in diagonal sequence until all mating surfaces are pulled together.
- 2. Tighten the bolts in diagonal sequence to 350 ± 50 lb. ft. (476. ± 68. N·m).
- 3. Tighten the bolts in diagonal sequence another 1/3 turn.
SHOE BOLT TIGHTENING SEQUENCE
Check the rims weekly for cracks, especially around the bolt holes. If cracks are present have rim inspected by a AVSpare dealer.
Do not weld on rim or adapter with carcass installed. Extensive damage or personal injury could result.
In severe applications, rims may become dented. Dents are normally of little consequence, but should be checked to assure that they have not caused the rim to crack.
The following procedure is used to install the adapter to the rim and the adapter to the wheel hub.
NOTE: Adapter to wheel hub and adapter to the wheel hub is 600 ± 60 lb. ft. (816. ± 81.6 N·m).
Adapter to Wheel Hub and Rim to Adapter Installation
- 1. Tighten two opposite nuts until the adapter is completely against the wheel.
- 2. Tighten all nuts to 100 ± 15 lb. ft. (136. ± 20.4 N·m).
- 3. Tighten all nuts to 600 ± 60 lb. ft. (816. ± 81.6 N·m).
- 4. Check the torque on any six nuts. If any of these six nuts are less than 540 lb. ft. (734.4 N·m), tighten all the nuts again to 600 ± 60 lb. ft. (816. ± 81.6 N·m).
Check the tires weekly for cuts, gouges and breaks. Immediate repair of a damaged carcass can prevent total tire failure. Any cut over 3/8 inch (9.5 mm) deep should be repaired by a AVSpare dealer. If a water spray shows a cut to be leaking, the carcass must be removed from the vehicle for repair.
Total belt failure can cause extensive damage to vehicle.
In severe working conditions the reinforcing steel cables molded within the rubber belt body can become damaged. Daily inspection of the belt and carcass is strongly recommended to minimize the possibilities of total failure, which can cause extensive damage. This inspection should be on a continuous basis throughout the life of the tire. The following items are important points to look for during belt inspection.
- 1. Check for deformation of the molded rubber ribs on the outer circumference of the mounting belt. These ribs can be inspected at the joints between each steel shoe. The ribs are molded straight across the belt, but become deformed when steel reinforcing cables fail within the mounting belt.
This deformation usually occures at the ends of the molded rib near the belt edges and appears as a slight "S" bend in adjacent ribs. Change in direction of deformation of two adjacent ribs identifies the location of a possible failure. Mark the location and inspect frequently. If the length of the deformation in the molded rib exceeds 4 inches (101.6 mm), the belt should be removed and a new one installed.