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Preparing To Use A Stihl Chainsaw
Definitions
1. Fuel Pump: Fills carburetor with fuel to simplify starting.
2. Twist Lock: Lock for carburetor box cover.
3. Chain Brake: A device to stop the rotation of the chain if activated in a kickback situation by the operator's hand or by inertia.
4. Oilomatic Saw Chain: A loop consisting of cutters, tie straps and drive links.
5. Guide Bar: Supports and guides the saw chain.
6. Front Chain Tensioner: Permits precise adjustment of chain tension.
7. Side Chain Tensioner: Permits precise adjustment of chain tension.
8. Adjusting Wheel: Permits precise adjustment of chain tension.
9. Chain Sprocket: The toothed wheel that drives the saw chain.
10. Chain Sprocket Cover: Covers the clutch and the sprocket.
11. Bumper Spike: Toothed stop for holding saw steady against wood.
12. Chain Catcher: Helps to reduce the risk of operator contact by a chain when it breaks or comes off the bar.
13. Decompression Valve: Releases compression pressure to make starting easier.
20. Muffler: Reduces engine exhaust noise and directs the exhaust gases.
21. Starter Grip: The grip of the starter, for starting the engine.
22. Spark Plug Boot: Connects the spark plug with the ignition wire.
23. Oil Filler Cap: For closing the oil tank.
24. Fuel Filler Cap: For closing the fuel tank.
25. Master Control Lever: Lever for choke control, starting throttle, run and stop switch positions.
26. Throttle Trigger Interlock: Must be depressed before the throttle trigger can be activated.
27. Throttle Trigger: Controls the speed of the engine.
28. Front Handle: Handle bar for the left hand at front of saw.
29. Front Hand Guard: Provides protection against projecting branches and helps prevent the left hand from touching the chain if it slips off the handle bar.
30. Rear Handle: The support handle for the right hand located at or toward the rear of the saw.
31. Rear Hand Guard: Gives added protection to operator's right hand.
Guide Bar Nose: The exposed end of the guide bar. (not illustrated, see chapter "Tensioning the Saw Chain".)
Clutch: Couples engine to chain sprocket when engine is accelerated beyond idle speed. (not illustrated).
Anti-Vibration System: The anti-vibration system includes a number of buffers designed to reduce the transmission of engine and cutting attachment vibrations to the operator's hands. (not illustrated).
SAFE HANDLING & OPERATIONS CHECKLIST
Before operation, perform an equipment inspection of the following:
- Handles and guards, to assure that they are sound, tight-fitting, properly shaped, free of sharp edges, and in place.
- Controls, to assure proper function.
- Chain-saw chains, to assure proper adjustment.
- Chain-saw mufflers, to assure that they are operational and in place
- Always wear protective clothing; work gloves, eye and ear protection and chain saw protective pants or chaps.
- All other safety devices, to assure that they are in place and functioning properly.
OTHER TIPS
- Make sure each tool is used only for purposes for which they are designed.
- The cutting chain should be sharpened in accordance with manufacturer?s specifications whenever it becomes dull during the workshift.
- Each tool should be stored in the proper location when not being used at a work site.
1) Always wear protective clothing:work gloves, eye and ear protection, and chain saw protective
pants or chaps.
2) When cutting, stand on firm ground to one side of the cut.Keep an escape route open, should a log start to roll. Never stand on a log pile.
3) When cutting a pile of wood, make sure the chain saw tip does not come in contact with any logs behind the one you are cutting. Such contact may cause the saw to kickback.
KICKBACK
Kickback occurs when the upper tip of the guide bar touches an object or when the wood closes in and pinches the saw chain in the cut (see Figure 1). This contact may cause a lightning-fast reverse action of the guide bar back toward the operator. Results of kickback include severe upper body, neck, and facial lacerations or death. Safety chain (and other features) minimize the dangers of kickback but do not eliminate the hazard.
CLOTHING
Always wear proper clothing when using a chain saw
- Chaps or leggings
- Safety glasses/goggles.
- A properly fitted hard hat protects your head from serious head injury from falling limbs or other debris.
- A good pair of ear plugs or ear muffs.
- Work gleoves.
- High-top, steel-toed boots.
CORRECT CHAIN TENSION
To ensure good cutting action and a long chain life, check chain tension frequently. If the chain is too loose, it will come off; if too tight, the chain will bind and overheat. All chains stretch with use. Most of the stretch occurs during the first half hour of operation.
Tip: A good way to ensure proper tension for the chain is to place a dime between the chain and the bar. Tighten the chain until it is snug against the dime. Remove the dime and your chain saw is ready to cut at the proper tension.