The Eaton Fuller mainshaft gear, part number 18520, is the overdrive (OD) mainshaft gear listed in the RTX-12509 and RTXF-12509 transmission parts manuals. In the mainshaft assembly, this gear is used together with parts 18519, 18521, 18522, and 18523 - making it a group-specific component that should be sourced alongside its companion gears when servicing that assembly. A genuine Eaton Fuller part, sold by Pro Gear and Transmission. Call us to confirm proper fit for your application before ordering.
Features
Genuine Eaton Fuller mainshaft gear, part number 18520
OD (overdrive) gear position in the mainshaft assembly
Fits RTX-12509 and RTXF-12509 Eaton Fuller transmissions
Used with companion parts 18519, 18521, 18522, and 18523
Sold by Pro Gear and Transmission
