The excavator bottom roller, also known as the track roller or lower roller, is a component of the undercarriage system of an excavator. It is responsible for supporting the weight of the excavator and providing stability and smooth movement on the tracks.
The excavator bottom roller is typically cylindrical in shape and is mounted on a shaft or axle. It is positioned at the bottom of the track frame, and the excavator's track chain runs over it. The bottom roller rotates as the track chain moves, allowing the excavator to traverse over various terrains.
The primary function of the bottom roller is to distribute the weight of the excavator evenly across the track chain. It helps to reduce wear and stress on the track components by preventing excessive contact and friction between the track chain and the ground. The bottom roller also assists in maintaining proper tension on the track chain, ensuring optimal track alignment and minimizing track derailment risks.
In terms of construction, the bottom roller consists of a metal outer shell or casing that houses internal bearings, seals, and lubrication mechanisms. These internal components allow for smooth rotation and provide protection against dirt, debris, and moisture from entering the roller.
The price range for excavator bottom rollers can vary depending on factors such as the excavator model, brand, size, quality, and supplier. Generally, a single bottom roller can cost anywhere from $100 to $500, but the exact price will depend on the specific excavator model and other factors mentioned above.
There are generally two types of excavator bottom rollers based on their design and construction:
1. Single Flange Bottom Roller: Single flange bottom rollers have a single flange or rim on one side of the roller. This flange is designed to guide and support the excavator's track chain. The opposite side of the roller is usually flat and rests directly on the ground or track pad. Single flange bottom rollers are commonly used in excavators with rubber or steel tracks.
2. Double Flange Bottom Roller: Double flange bottom rollers have flanges or rims on both sides of the roller. These flanges provide additional support and guidance to the track chain from both sides. Double flange bottom rollers are typically used in excavators with steel tracks, as the flanges help prevent lateral movement of the track chain. They offer increased stability and resistance against track derailment.
Both single flange and double flange bottom rollers serve the same basic purpose of supporting the excavator's weight, providing stability, and facilitating smooth movement on the tracks. The specific type of bottom roller used in an excavator depends on factors such as the excavator model, track type, and operating conditions.
It's important to choose the correct type of bottom roller that matches the excavator's specifications and track system. Using the wrong type of bottom roller can lead to inefficient operation, increased wear on the undercarriage components, and potential damage to the track system.
When replacing bottom rollers, it's advisable to consult the excavator's manufacturer or a reputable excavator parts suppliers to ensure compatibility and proper fitment for your specific machine.
