The first Apex service volume, LIT-12618-RX-01, was written to cover the 2006 and 2007 sleds together. Your 2006 Apex carries model code RX10GTL, and the Apex RTX with reverse and the Attak share the same pages.
Snowmobiles of this generation are now long out of dealer support, so the factory book tends to be the only source with real numbers in it. Clutch and drive system specifications, track tension and alignment figures, suspension settings, engine clearances and torque values are all stated rather than described.
Chapters follow the factory layout: periodic maintenance, engine, fuel and cooling, power train, chassis, electrical and troubleshooting. Wiring diagrams are included for the machines covered, which matters on a sled where a charging or ignition fault can otherwise take a whole weekend to find.
