During normal operation, the track pin slowly rotates backwards in the pin hole, the two wear evenly, the pin hole gradually becomes larger, and the pin gradually becomes thinner. If the operation is improper, such as high-speed turning of the track shoe wear and repairing bends, starting abruptly, or entering muddy water, weeds, etc. to block the pins, it will cause the left and right sides of the track shoe to bend and sag due to excessive pressure. Deformation and bending, the pin track shoe cannot be rotated in the wear pattern and repair hole, the pin and the pin hole become sliding friction, and the friction part is limited to a small part of the contact surface, the pin is gradually ground into a bent shape, and the pin hole also becomes Wear regularity and repair of oval track shoes. The enlarged pin hole causes the track pitch to be longer (the pitch is the center distance between the holes at both ends of the track shoe), so the track shoe and the drive wheel gnaw each other, the track shoe is worn through, and the drive wheel teeth are knife-edged. According to measurements, when the pitch changes from 174 mm to 184 mm, the opening width of the drive wheel teeth changes from 87 millimeters of track shoe wear and repair to 97 millimeters. At this time, the normal rolling engagement is completely destroyed.
Treatment of old track shoes-specific treatment method: After degumming, the joint surface of the workpiece and the rubber is chemically treated, that is, soaked in formic acid to remove rust, and then polished with a grinding wheel (if possible, the grinding machine can be used for grinding operations). When polishing, pay attention to ensure the smoothness of the joint surface as much as possible and the amount of grinding should be as small as possible. After the wear law of the track shoe is treated and the joint surface must not have any rust after repair. Then clean the work piece with gasoline, dry it and apply the wear pattern and repair agent of the bonded track shoe.