Bobcat Triple Flange Bottom Roller (6689371) This aftermarket replacement bottom center track roller is designed for specific Bobcat compact track loaders (CTLs). Detailed information is as follows: I. Core Compatible Models Suitable for the following Bobcat models (note chassis type restrictions): T140, T180, T190, T200, T250, T300, T320, 864 T630 (serial numbers AJDT11001 - AJDT12076, solid mount undercarriage only) T550 (serial numbers A7UJ11001 & above, AJZV11001 - AJZV13999) T650 (solid mount undercarriage only; not compatible with suspension mount systems) T750 (solid mount undercarriage only; not compatible with suspension mount systems; serial numbers ANKA11001 & above, ATF611001 & above) T770 (machine-specific serial number and solid mount suspension type must be verified) II. Special Compatibility Notes for T590 Series This roller is compatible with the T590 series (solid mount undercarriage only; not compatible with suspension mount systems). Confirm the following serial number ranges before ordering: A3NR11001 - A3NR15598 (solid mount) A3NS11001 - A3NS11999 (solid mount) ALJU11001 - ALJU16824 (solid mount) B37811001 - B37811103 III. Part Numbers and Version Information Corresponding Bobcat dealer part numbers: 6689371, 6686632 Version differences: This model: New bolt-on style, requires bolts (model 31C1224, sold separately) Older model: Threaded post and nut style, part number 6732901, compatible with older Bobcat models, interchangeable with this model Additional note: We also stock the older threaded post-and-nut style roller, available for purchase on our website IV. Installation Quantity and Maintenance Recommendations Quantity verification: Older T190 models: 3 per side Newer T190 models: 4 per side Larger models: 5 per side Always confirm the number of bottom rollers per side on your equipment before ordering Maintenance advice: It is recommended to replace the rear idler and the bottom rollers at the rear of the machine simultaneously. When Bobcat track loaders are unloaded, weight is concentrated on the rear idler and rear bottom rollers, causing faster wear on the rear components. Replacing them together ensures even wear and extends overall service life V. Product Quality Features Manufactured to strict original specifications with a triple flange design for precise fit Equipped with high-quality double lip seals: Effectively blocks dust and debris, retains lubrication, and extends service life Includes installation hardware for ready-to-install use upon delivery VI. Related Undercarriage Parts We also supply a full range of undercarriage components for Bobcat compact track loaders, including: T300 Series CTL deep sprockets Bolt-style bottom rollers Front idlers (6732902, 6693237) Solid mount rear idlers (6732903)