The Eaton Fuller O-Ring, part number 18109, is a genuine OEM seal used in the auxiliary countershaft pump group of Eaton Fuller heavy-duty transmissions. Listed in the illustrated parts manuals for 30 transmission models, including RTLO-14713A, RTLOF-14713A, RTO and RTOF variants in the 11607L, 11608LL, and 14608LL families, and RTX and RTXF models spanning the 12509, 12510, 12515, 14608LL, 14609A/B/P/R, and 15615 series. Call us to confirm proper fit for your specific transmission build.
Interchanges:
- 18109-SP
- 3088-18109
- FUL18109
Features
Genuine Eaton Fuller OEM part number 18109
Auxiliary countershaft pump group seal application
Fits 30 transmission models including RTLO-14713A, RTO-11607L, RTX-12509, RTX-15615, and RTXF variants
Sold individually (each)
Used in 32 Eaton Fuller models
