This is a service manual for Fuller Heavy Duty Transmissions TRSM0507 October 2007 RTX-11509 RTX-12509 RTXF-11509 RTXF-12509, which details the product's specifications, lubrication, disassembly precautions, inspection, reassembly, precautions, shifting controls, air systems, air valves, filters/regulators, gear shift lever housing, shift bar housing, auxiliary sections, removal and installation.