Excessive wear that occurs when the track links come into contact with the flanges of single- or double-sided track rollers is referred to as track rail galling. The existence of rail galling leads to premature wear of the track links, affects the stability of track transmission, and in turn impacts the straight-line travel of the machine, causing deviation. If rail galling is severe, it will shorten the service life of the undercarriage and reduce the working efficiency of the bulldozer. Therefore, during the manufacturing process, strict control must be implemented to prevent the occurrence of rail galling.
Because the hardness of the track rollers is greater than that of the track links, the track links wear first. When the wear becomes severe, a layer of iron filings will appear on the platform frame. A method to determine whether rail galling is occurring in the undercarriage is to observe the inner and outer wear conditions of the track links after the bulldozer has been operated for several hours. If wear is present and feels smooth to the touch with no steps, it is considered normal wear. If the wear feels rough and steps are present, it indicates rail galling.
There are many causes of rail galling. However, rail galling caused by manufacturing quality issues of the main equipment manufacturers is mainly due to the following reasons:
Rail galling caused by manufacturing defects in the track frame.
Improper adjustment of the idler, resulting in the idler not being aligned on the same centerline as the sprocket and track rollers, thereby causing rail galling.
Differences in track frame stiffness leading to frame deformation and rail galling.
Rail galling caused by deformation of the axle shaft.
The tapered spline of the sprocket is not fully pressed into position, resulting in rail galling.
Rail galling caused by unqualified track rollers, carrier rollers, or idlers.
Excessive deviation in the straightness of the track chain, leading to rail galling.
Rail galling caused by improper operation or use.
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