Correct maintenance of bulldozers Adjustment of track tension---Quanzhou track chassis guide wheels

(1) The track keeps proper tension

    If the tension is excessive, the spring tension of the guide wheel acts on the track pin and the pin sleeve. The outer circle of the pin and the inner circle of the pin sleeve have been subjected to high compression stress. The pin and the pin sleeve will wear prematurely during operation, and the guide wheel will be tensioned. The elastic force of the spring also acts on the guide wheel shaft and the bushing, resulting in a large surface contact stress, which makes the guide wheel bushing easy to grind into a semicircle, the track pitch is easy to elongate, and it will reduce the mechanical transmission efficiency and waste the engine transmission. The power of wheels and tracks. ---Quanzhou track chassis guide wheels

    If the track tension is too loose, the track will easily break away from the guide wheel and the supporting roller, and the track will lose the correct alignment, causing the running track to wave, flap, and impact, causing abnormal wear of the guide wheel and the supporting wheel.

    The adjustment of the track tension is by adding butter to the oil nozzle of the tensioning cylinder or discharging butter from the oil discharge nozzle, and adjust with reference to the standard gap of each model. When the track pitch is stretched to the point where it is necessary to remove a set of track sections, the meshing surface of the drive wheel tooth surface and the pin sleeve will also be abnormally worn. At this time, proper treatment should be carried out before the meshing condition deteriorates, such as connecting the pin and the pin. Turn over the sleeve, replace excessively worn pins and pin sleeves, and replace the track section assembly. ---Quanzhou track chassis guide wheels

    (2) Keep the guide wheel in the center

    The misalignment of the guide wheel has a serious impact on other parts of the traveling mechanism, so adjusting the gap between the guide plate of the guide wheel and the crawler frame (correcting the misalignment) is the key to prolonging the life of the traveling mechanism. When adjusting, use the gasket between the guide plate and the bearing to correct it. If the gap is large, remove the gasket; if the gap is small, add the gasket. The standard gap is 0.5～1.0mm, *allowable gap is 3.0mm.

    (3) Turn over the track pin and pin sleeve at an appropriate time

    During the wear of the track pin and the pin sleeve, the track pitch is gradually elongated, resulting in poor meshing between the drive wheel and the pin sleeve, resulting in damage to the pin sleeve and abnormal wear of the drive wheel tooth surface, which can cause snakes, flaps, and shocks. Greatly shorten the life of the walking mechanism. When the pitch cannot be restored by adjusting the tension, it is necessary to turn the track pin and pin sleeve over to get the correct track pitch. There are two ways to determine when the track pin and the pin sleeve turn over; one method is to check the time when the track pitch is elongated by 3mm; the other method is to check the time when the outer diameter of the pin sleeve wears 3mm. ---Quanzhou track chassis guide wheels

    (4) Tighten bolts and nuts in time

    When the bolts of the walking mechanism are loose, they are easily broken or lost, causing a series of failures. Routine maintenance should check the following bolts: mounting bolts for support wheels and supporting wheels, drive gear tooth block mounting bolts, track shoe mounting bolts, roller guard mounting bolts, and diagonal brace head mounting bolts. Refer to the manual of each model for the tightening torque of the main bolts.

    (5) Lubricate in time

    The lubrication of the walking mechanism is very important. Many roller bearings "burned" and the fees were reported because of oil leakage and were not discovered in time. It is generally believed that the following five places may leak oil: due to defective or damaged O-rings between the retaining ring and the shaft, oil leaks from the outside of the retaining ring and the shaft; due to poor contact of the floating seal ring or defects in the O-ring, from the retaining ring Oil leaks between the outside of the ring and the supporting wheels (supporting wheels, guide wheels, driving wheels); due to poor O-rings between the supporting wheels (supporting wheels, guide wheels, and driving wheels) and the bushings, the Oil leaks between the rollers; oil leaks at the fuel filler plug due to loosening of the filler plug or damage to the seat hole of the tapered plug seal; oil leaks between the stop cover and the rollers due to poor O-rings. Therefore, you should always check the above parts, and add and replace them regularly according to the lubrication cycle of each part. ---Quanzhou track chassis guide wheels

    (6) Check for cracks

    The cracks of the walking mechanism should be checked in time, and welded and repaired and strengthened in time. ---Quanzhou track chassis guide wheels