bulldozers work under harsh environmental conditions all year round, the most worn is the four-wheel belt, if everyone can use the operation correctly, strict maintenance, a pair of bulldozer crawlers can exceed 3 times the original service life, greatly saving costs According to the experience of using maintenance technology summarized by the veterans, there are three main items: turning the track pin, correcting the track shoe and repairing in time. Now share with everyone!

　　1: Wear rule of track shoes

　　During normal operation, the track pin slowly rotates backwards in the pin hole, the two are evenly worn, the pin hole gradually becomes larger, and the pin gradually becomes thinner. If the operation is improper, such as turning at a high speed, violently starting, or entering muddy water, weeds, etc., the plug will be blocked. It will cause the left and right sides of the track shoe to sag downward due to excessive pressure, and the pin deforms and bends, and cannot rotate in the pin hole. The pin and pin hole become sliding friction, and the friction part is limited to a small part of the contact surface, the pin is gradually grinded into a zigzag shape, and the pin hole also becomes elliptical. The enlarged pin hole also causes the track pitch to be lengthened, that is, the center distance of the holes at both ends of the track shoe, so the track shoe and the drive wheel nibble each other, the track shoe is worn through, and the tooth of the drive wheel is in the shape of a blade. According to the measurement, when the pitch is changed from 174 mm to 184 mm, the opening width of the driving wheel gear teeth is changed from 87 mm to 97 mm. At this time, the normal rolling engagement is completely destroyed. As the track shoe pitch is elongated, it also causes the rollers to jump while walking, which accelerates the wear of the track shoe track part. When the runway is depressed more than 4 mm. It should be repaired.

　　Worn track shoe guide. The main reason is that the track is misaligned, the track shoes are seriously deformed, and the axial sway of the rollers and guide wheels is too large, which is a common cause of scrapped track shoes. The parts that are in mesh with the drive wheel are severely worn or worn through.

　　2: Correct use and maintenance of track shoes

　　The most important thing in use and maintenance is to ensure that the pin rotates frequently in the pin hole. During each maintenance, the stuck pin should be restored to rotate. The method is to use a special wrench to snap the S-shaped pin and rotate the pin backward. If you do this strictly when you use the new track. The workload of each shift is not large. Generally, we only have 2-5 pins in a shift here. The second is to regularly check and correct the deformation of the track shoe to ensure that the pin holes are concentric and prevent the pin from being worn. If a pin feels too hard when it is pulled with a wrench, the two front and rear track shoes connected by this pin are very It may be deformed, and a special model ruler can also be used to check whether the track shoe is deformed. Those that have been deformed should be corrected in time. The correction method is to support the deformed track shoe sag portion without heating, and directly use a sledge hammer to guide the hammer a few times to correct it. In addition, it is also important to adjust the various parts of the walking device correctly. Attention should be paid to the regular displacement of track rollers, track rollers, track rollers, track rollers, track rollers, guide wheels and drive wheels. When the wall thickness of the track pin hole is only 2-3 mm, the outer diameter of the meshing part with the drive wheel reaches 33-34 mm, and the runway is sunken by 4--5 mm, it should be repaired before use. The ones that can be repaired should be repaired as much as possible, and there is no need to replace the whole set with new ones. Old and new track shoes should be used together at intervals to make the pitch as uniform as possible. When the track pin diameter is 18 mm, the new pin should be replaced to shorten the pitch by 4 mm, which is beneficial to extend the service life of the track.

　　3: Repair of track shoes

　　The pin hole of the track shoe is slightly worn. When the gap between the standard pin is only 2-3 mm, the track shoe can be heated to 800-850 ℃, it is cherry red, and then the standard pin is drawn and pressed with a special die. Outside the pin hole, hammer the die to retract the pin hole and clear the gap. When the pin holes of the track shoe are badly worn, they should be embedded into semi-circular pieces or into a whole set according to the situation, and then welded at both ends. The insert should be made of wear-resistant steel, and its thickness should be measured one by one after the standard pin is inserted into the quiet hole. Before the insert is burnt into the hole, the head should be quenched to prevent deformation of the head when inserting. The track shoe has been worn through the pin hole. The repair method is to insert the pin hole part into the standard pin after burning red, hammer the broken hole wall, so that the residual wall covers the pin, and then wrap a semi-circular steel sheet to weld it. . Before inserting the sub-insert or hole, wrap the pin hole with a standard pin to remove the burr edge. The insert or package should be as close as possible before welding, otherwise the welding will not be secure. Note that the welding seam should be flat to prevent molten iron from entering the hole. When the part where the track shoe and the driving wheel are engaged is heavily worn or worn out, a semi-circular steel sheet can be wrapped from the outside and welded around. A portion of the runway is sunk by 4--5 mm. A steel plate can be welded. The main problem after the repair of the track shoe is that it is not enough to wear. But overall it can extend the service life of the track by at least a few hundred hours, which is also a good choice!