Blade won't go up and down - Bosch Electric Table Saws

Make sure the blade is the correct size. Check to see if the blade is on correctly and tight.

Most have lugs the blade fit in and washer on bolt.

hey john bruce . what type of mower . there could be many reason . there blade clutch there a cable you have to hold down to start the mower could be causing it not to turn or the engine could be seized if so remove the oil ffrom the mower remove the spark plug tie spark plug wire away from any metal . get some :PBblast or trans fliud pour a cap ful down the spark plug hole leave the mower ( if small one vertical for1-2 days if there a blade clutch tie up with shoe lace to handle remove blade or use chnk of wood and big hammer hit the wood to see it blade will move if does try again the allow fliud in spark pug hole to loosen the blind ( understand when that blde may loosen and the mower may run it will smoke badly do not run on fast and after it run and hopefully loosen up change oil and good luck . i been in the lawn maintenance and repair for 43 yrs . if it work you may get a shorter life out of the mower of maybe not bruce

It sounds like the chain does want sharpening, it depends on what you are cutting ( type of timber, dirty timber,burnt timber etc ) as to how long before it needs sharpening, if the chain comes into contact with the ground below the tree it will lose its edge instantly.

if the blade keeps coming loose replace the hub that holds the blade in place

Use a block of wood to hold blade stationary while tightening bolt. Ensure threads are cleaned with a wire brush before tightening. Is there a spacer or washer missing?

your bearings out on spindle housing above the blade.

Did you check under the deck for clogs? If its not clogged, DISCONNECT the spark plug wire, and try to turn the blade by hand... Oh yeah, did I mention DISCONNECT the sparkplug wire FIRST! If the blade won't budge, you might have a seized engine. If the blade does move, the problem is in the starter recoil. Rewind the starter string, and check the spring for damage. Good luck!

Do you mean the chain won't move, or you can't get the blade off? The chain brake must be off to allow the chain to move. The chain brake handle has a housing that engages a gear attached to the chain brake inside the cover where the blade is attached. The brake must be off to remove the cover (usually held on by two nuts). The blade tension screw should be loosened to allow the blade to be removed, then retightened when replacing the blade. Tightening it pushes the blade out from the saw, so if it is tight, you won't be able to remove the blade. Hope this helps.

Unplug the saw. Put the blade on and finger-tighten the nut. Then rest the blade on a piece of scrap wood so that it won't slip. Then tighten down the nut and you should be fine.