The 107891 idler is a critical undercarriage component designed for various mini excavators and compact track loaders. This idler ensures proper track tension and smooth operation for models including Bobcat 325, 328, 329, 331, 334, 335, 337, 341, 430, 435, E32, E35, E42, E45, E50, E55; Gehl 353, 373, 383, 393, 453, 463, 483, 503, 523, 553, 563, 603, 653; New Holland E27B, E30B, E35B, E26C, E33C, E37C, E30SR, E35SR, E27SR, E30.2, E35.2, E27.2; Takeuchi TB125, TB135, TB145; and Yanmar VIO30, VIO35, VIO40, VIO45, VIO50, VIO55, B27, B37, B50, B30V, B37V, B50V, C30R, C50R. It is an essential part for maintaining the integrity and performance of the track system. Replaces OEM part numbers such as Bobcat 6814670, Gehl 08200020, New Holland 87405763, Takeuchi 08200020, and Yanmar 17212037100.