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hopefully your turning the bolt the right way. if so what i have done in the past is to use a air chisel with a pointed attachment on it and cover your ears and vibrate the heck out of them. all your using the chisel for is the vibration. it will loosen the rust you evidently have around the blade bolts. i am not kidding about the ear protection i know mine is very loud. try that and see it that does it for you.hope this helps
Maybe the drain on the battery is causing the engine to slow during idle This might cause the engine to run roughly and induce vibration. Why change motor mounts. Have a service and refit the original mounts if they are not an issue
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You have the information you need. The chain you need should have 56 cutting teeth and be 3/8ths pitch to ensure it fits the drive on the chainsaw and the wheel at the end of the bar. All you have to choose is the type of profile on the cutting teeth. In the UK we have a choice of Chisel or semi Chisel which mean the following. The Chisel has a flat top and sharp angle down to the chain link and although very efficient at cutting only tends to be used by professionals. The semi Chisel has the corner of the tooth rounded between the flat top and the link. This reduces the amount of kick back (but does not eliminate it). It also reduces the vibration a little when cutting. From the number of teeth it sounds like you probably have a 14 or 15 inch bar. If in doubt measure the length from the body of the saw to the end of the bar. Many on line suppliers will be able to sell you a chain but I would recommend you go to a chainsaw supplier the first time to ensure you get exactly what you need then you can order online for your second and subsequent chains.
If it ismaking a steady noise, the motor that runs the defrost timer may be making noise. I f the timer motor is making a loud noise, then you should replace the timer.Vibration noises are often caused by dishes or containers vibrate on a shelf inside.
Could be a stuck impact bolt, try banging the chisel hard against the concrete and see if it makes a difference. If not it is probably an internal piston/cylinder fault. Take it to a repair centre. You can get a drawing from Hitachi's web site if you wish to do it yourself.
you need to get that chisel out. If it was hammering with it before the end of the chisel might have broken and not coming into contact with the striker, if it did not then the end of the chisel might be damaged not allowing it to seat fully, either way get the chisel out and put in a regular bit and it will probably work.
Sounds like lubrication. Used special grease only. May have broken cam. Hammer will run like you say if no load is placed on drill tip. Test it on a rock. Probable rebuild adviseable.
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