It is often happened on machine owners that when replacing track rollers, they prefer to replace the broken one, but if the new roller’s dimension is not fully the same with OEM parts, it is crucial to replace all rollers by the aftermarket rollers. Why is that? Here is a detailed analysis of the specific reasons:
- Maintaining Correct Track Tension
The height of the track roller is a key geometric parameter determining track tension.
A. Undersized Dimensions: If the diameter of the new track roller is smaller than the original specifications, it will cause the overall track to become loose. An overly loose track is prone to derailment during travel, especially when turning or operating on uneven terrain, posing serious safety hazards and risking equipment damage.
B. Oversized Dimensions: Conversely, if the roller body is too large, it will cause the track to become overtightened. An overtightened track places immense extra pressure on the bearings and seals of the idlers, sprockets, and travel motors, accelerating the wear of these components and potentially leading to oil leaks or failure.
- Ensuring Uniform Load Distribution
The core function of the track roller is to support the machine's weight and transfer it evenly to the track shoes, ultimately dispersing it to the ground.
A. Inconsistent Height: If the height varies among rollers on the same side or across the machine, the weight will not be distributed evenly. Some rollers may bear loads far exceeding their design limits, while others might "float" or bear very little force. This not only accelerates the wear of individual rollers but also leads to uneven stress on the track shoes, causing abnormal wear or deformation.
B. Reduced Length: Some inferior products diameter may be smaller, this not only alters the track's running trajectory but also reduces the contact area with the track, increasing the pressure per unit area and accelerating wear.
- Ensuring Proper Engagement with Track Shoes
The flanges of the track roller serve to guide the track and prevent lateral slippage.
A. Inconsistent Length: Variations in the roller body length affect the relative position between the flange and the inner side of the track shoe. If the length does not match, the flange may fail to effectively constrain the track, increasing the risk of the track running off or derailing.
B. Impact on Transmission: Although the track roller itself is not a drive component, it supports the engagement between the track and the sprocket. Changes in its dimensions can indirectly affect the track pitch and the engagement state with the sprocket, potentially leading to unstable travel, abnormal noise, and accelerated wear on the sprockets and track bushings.
In summary, the track roller is a precision link in the undercarriage's "four-wheel-and-one-track" system. During replacement, it is essential to ensure that all critical dimensions—particularly the rim height and length, are perfectly consistent with the original factory specifications, option2 is to replace all rollers and track chains from the same undercarriage brand, this is the right way to guarantee smooth, efficient travel and to maximize the service life of the entire undercarriage system.
