What is the Correct Way to Repair the Bulldozer?

Jan. 22, 2020

Today Wheel Excavator China Supplier will introduce the method of correct maintenance of the bulldozer.

What is the Correct Way to Repair the Bulldozer?cid=2

Crawler Dozer

(1) Maintain proper tension of the track

For the Crawler Dozer, if the tension is excessive, the spring tension of the guide wheel will act on the track pins and pin sleeves. The elastic force of the wheel tension spring also acts on the guide wheel shaft and the sleeve, which generates a large surface contact stress, which makes the guide wheel shaft sleeve easy to be ground into a semicircle, the track pitch is easily stretched, and the mechanical transmission efficiency is reduced, and the engine is wasted Power transmitted to drive wheels and tracks.

If the track is tightened too loosely, the track is easily detached from the guide wheels and track rollers, and the track loses the correct centering, causing the running track to fluctuate, flap, and impact, causing abnormal wear of the guide wheels and idlers.

The adjustment of the track tension is made by adding grease to the oiling nozzle of the tensioning cylinder or releasing the butter from the oiling nozzle, referring to the standard clearance of each model. When the track pitch is stretched to the point that a group of track links need to be removed, the toothing surface of the drive wheel and the pin sleeve will also be subjected to abnormal wear. At this time, appropriate treatment should be performed before the meshing condition deteriorates, such as pin and pin Overturning of sleeves, replacement of worn pins and pin sleeves, replacement of track joint assemblies, etc.


(2) Keep the centering of the guide wheel

Misalignment of the guide wheel has a serious impact on other parts of the running mechanism, so adjusting the gap between the guide wheel guide plate and the track frame (correcting misalignment) is the main point of extending the life of the running mechanism. When adjusting, use the spacer between the guide plate and the bearing to correct. If the gap is large, remove the spacer; if the gap is small, increase the spacer. The standard clearance is 0.5 ~ 1.0mm, and the maximum allowable clearance is 3.0mm.


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

During the wear of track pins and pin sleeves, the track pitch is gradually lengthened, resulting in poor meshing between the drive wheel and the pin sleeve, resulting in damage to the pin sleeve and abnormal wear of the tooth surfaces of the drive wheels, which can cause hunting, flapping, and impact. Greatly shorten the life of the walking mechanism. When the pitch cannot be restored by adjusting the tension, the track pins and pin sleeves need to be turned over to obtain the correct track pitch. At the scene, there are two kinds of moments for determining the turning of the track pin and the pin sleeve; one method is to check the time when the track pitch is extended by 3mm; the other method is to check the time when the outer diameter of the pin sleeve is worn by 3mm.


(4) Tighten bolts and nuts in a timely manner

When the bolts of the walking mechanism are loose, they are easily broken or lost, causing a series of failures. The daily inspection and maintenance should check the following bolts: mounting bolts for track rollers and idlers, mounting bolts for driving gear teeth, track plate mounting bolts, track roller guard plate mounting bolts, diagonal stay head mounting bolts. Refer to the manual of each model for the tightening torque of the main bolts.


(5) Timely lubrication

The lubrication of the traveling mechanism is very important. Many roller bearings are "burned to death" and the charge is not due to oil leakage. It is generally believed that the following five places are likely to have oil leakage: due to bad 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 ring or O-ring defects, There is oil leakage between the outer side of the ring and the supporting wheels (supporting wheels, guide wheels, driving wheels); due to the bad O-ring between the supporting wheels (supporting wheels, guide wheels, driving wheels) and the bushing, Oil leaks between rollers; oil leaks at the filler plugs due to loose oil filler plugs or damaged seat holes sealed by conical screw plugs; oil leaks between the cover and rollers due to bad O-rings. Therefore, you should pay attention to check the above parts, and regularly add and replace according to the lubrication cycle of each part.


(6) Check for cracks

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


The above is the bulldozer maintenance method introduced by Bulldozer China Supplier. Have you learned it?

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