This comprehensive service repair manual provides detailed instructions for maintaining and repairing your Stihl 070 and 090 series saw chains. It covers all aspects of these machines, including the engine, fuel system, saw chain drive with clutch, ignition system, driving parts, oil pump, rewind starter, AV-handle, and special tools. With clear, step-by-step instructions, you'll learn how to perform critical tasks like troubleshooting, disassembling, and reassembling your saw chain, ensuring it runs smoothly and efficiently. Whether you're a seasoned mechanic or a DIY enthusiast, this manual will equip you with the knowledge and confidence to handle any repair or maintenance need. Save money and extend the life of your saw chain by mastering its inner workings with this indispensable guide.

The Stihl 070 and 090 series chainsaws are legendary in the world of forestry and logging. These powerful machines, renowned for their robust construction and brute strength, were developed in the late 1960s and early 1970s, primarily targeted at professional lumberjacks and large-scale timber operations. The 070, released in 1968, was the first chainsaw to feature a displacement exceeding 100 cubic centimeters, boasting an impressive 72 cc engine. Its successor, the 090, introduced in 1973, upped the ante with a massive 94 cc displacement, making it the most powerful production chainsaw ever built. Both models were designed for tackling the most demanding tasks, from felling massive trees to clearing dense undergrowth, and quickly became industry standards for their reliability and raw power. The Stihl 070 and 090 are distinguished by their distinctive design. They feature a sturdy, cast-aluminum crankcase, a robust piston-port engine, and a large, heavy-duty clutch system. The saws are fitted with a distinctive, large chainsaw bar and chain, capable of handling logs of considerable size. The design also incorporates a powerful, direct-drive magneto ignition system, along with a robust carburetor for reliable fuel delivery. These machines were built to withstand the harshest conditions, utilizing high-quality materials and meticulous manufacturing processes, ensuring longevity and durability in the face of intense usage. While they are no longer in production, the 070 and 090 series remain highly sought-after by collectors and enthusiasts due to their historical significance and impressive engineering.