Husqvarna chainsaws This workshop manual provides a detailed description of procedures for trouble shooting, repair and testing of these chain saws. Husqvarna chainsaws This workshop manual provides a detailed description of procedures for trouble shooting, repair and testing of the chain saws. Safety precautionsthat should be taken during repair are also described. This workshop manual applies to the engine assembly in the following chain saws: Model 181 1. Technical Data 3 2. Service Data 5 3. Special Tools 7 4. Fuel System 11 5. Electric System 17 6. Lubricating System 19 7. Cylinder, Piston 23 8. Crankcase, Crankshift 27 9. Starter 33 10. Centrifugal Clutch 35 11. Safety Equipment 37