Solutions To The Daily Maintenance Of Bulldozers

March 03, 2021

(1) Keep track of 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 at the same time. 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, and 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.

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 fluctuate, beat, and impact, causing abnormal wear of the guide wheel and the supporting wheel.

The track tension is adjusted 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, replace the track section assembly, etc.

(2) Keep the guide wheel in the center

The misalignment of the guide wheel has a serious impact on other parts of the running mechanism, so adjusting the gap between the guide plate of the guide wheel and the crawler frame (correcting the misalignment) is the key to extending the life of the running 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, and the maximum allowable gap is 3.0mm.

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

During the wear process 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 the pin sleeve over to obtain the correct track pitch. There are two ways to determine the time 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.

(4) Tighten the bolts and nuts in time

When the bolts of the walking mechanism are loose, they are easy to break or lose, causing a series of failures. Routine maintenance should check the following bolts: mounting bolts for supporting wheels and supporting wheels, mounting bolts for drive wheel tooth blocks, mounting bolts for track shoes, mounting bolts for supporting wheel guards, and mounting bolts for diagonal brace heads. Refer to the manual of each model for the tightening torque of the main bolts.

(5) timely lubrication

The lubrication of the walking mechanism is very important. Many roller bearings "burned out" and the expense was not discovered in time because of oil leakage. It is generally believed that there may be oil leakage in the following five places: due to defective or damaged O-rings between the retaining ring and the shaft, oil leakage 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, from the bushing and 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 a defective O-ring. Therefore, you should always pay attention to check the above parts, and add and replace them regularly according to the lubrication cycle of each part.

(6) Check for cracks

The cracks of the walking mechanism should be checked in time, and welded and repaired and strengthened in time.

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