How to maintain the track idler roller of Komatsu excavator correctly?
(1) Keep track tension properly
If the tension of the idler roller spring acts on the track pin and track bush, the outer circle of the pin and the inner circle of the pin sleeve are always subjected to high extrusion stress. When the pin and pin sleeve are in operation, the pin and pin sleeve are abraded prematurely. At the same time, the elastic force of the guide wheel tension spring also acts on the guide axle and sleeve, resulting in large surface contact stress, which makes the guide wheel sleeve easy to be ground into a half circle and the track pitch is easy to Long, and will reduce the efficiency of mechanical transmission, waste engine power to drive wheels and crawlers.
If the track tension is too loose, the track is easy to break away from the guide wheel and the supporting wheel, and the track loses the correct alignment, which makes the running track fluctuate, beat and impact, resulting in abnormal wear and tear of the idler roller and the track roller.
Track tension is adjusted by adding butter to the nozzle of the tensioning cylinder or releasing butter from the nozzle, referring to the standard clearance of each model. When the track pitch is extended to the point where a group of track pitches need to be removed, the meshing surface between the driving wheel tooth surface and the pin sleeve will also suffer abnormal wear. At this time, proper treatment should be carried out before the meshing condition deteriorates, such as turning the pin and pin sleeve over, replacing the pin and pin sleeve with excessive wear, replacing the assembly of the track joint, etc.
(2) Keep the idler roller aligned
The guide wheel misalignment has a serious impact on other parts of the walking mechanism, so adjusting the gap between the guide plate of the guide wheel and the crawler rack (correcting the misalignment) is the key to prolong the life of the walking mechanism. When adjusting, the gasket between guide plate and bearing is used to correct. If the clearance is large, remove the gasket; if the clearance is small, increase the gasket. The standard clearance is 0.5-1.0 mm and the maximum allowable clearance is 3.0 mm.
(3) Turn over the track pin and pin bush at an appropriate time
During the wear process of track pin and pin sleeve, the pitch of track pitch is gradually elongated, resulting in poor meshing between driving wheel and pin sleeve, leading to pin sleeve damage and abnormal wear of driving wheel tooth surface, which will lead to snaking and slapping.
