I need to find the part # of the part that you bolt the blade to under neath the tractor it is a42 inch 17.5hp please and thank you or if some one can send me acopy of the list of parts # and an exploded diagram of the under carridge

Loosen the bolt in the center of the blade.

Turn counter clockwise hold blade with rag

The H should match up to front and center of tractor.

belt broken or split pulley have look and see under neath lawm mower chassi

It is normally threaded, which is to say it has right hand threads. So you will need to turn left to loosen. You can take a block of wood to brace the blade or use vice grip pliers to block the blade. The blade needs to be immobilized to loosen the bolt.

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Always unscrew the bolt in the same direction of blade travel.If the blade travels clockwise,loosen bolt by going clockwise.

On most riding lawnmowers, you can remove the blades reaching underneath the deck while the deck is set to its highest position. This may not be possible on lawnmowers with three blades; however, most 42 inch mowers have two blades.

The blades are usually held on with either one or two bolts (on each blade). Oftentimes, too, there is a lock washer underneath the bolt.

If you have auto ramps, it might help to push the front end of the mower up on the ramps. This can give you more room to access the blade bolts.

If the blades have not been removed before, those bolts can be on really tight. You might need to use some kind of breaker bar on your wrench to give you more leverage.

Sometimes the blade bolts are tight from the factory.Try and lift the front of the mower to get under the deck if you don't want to take the deck off. If you don't have an impact gun use a small piece of 2x4to wedge between the blade and the edge of the mower housing to stop the blade from turning while you use a 5/8 socket on a 1/2 inch breaker bar or large ratchet, be careful you don't slip and cut yourself on the blades,wear gloves and when reinstalling blades be sure to align the star hole in blade with the star on the blade mandrel

Spray the blade/shaft top and bottom with WD40, etc.,and let soak for awhile. Take a pipe wrench, as large as you can get under the deck, and place on edge of blade about 4 inches from shaft. Use the wrench as a fulcrum to pivot the blade off. If needed do both sides of blade until it lets loose. Hope this helps...

there should be a bolt in the meddle of each
blade 9/16 or 5/8 headed bolt remove the bolt sharpen
blade w/grinder and replace same as removal

Sounds like the bearings are going out in one or both of your blade spindles. With the belt off,(and engine, of course) engage the lever on the dash. That will release the blade brake so the blades will be free to turn. Spin each one by hand. It will be easy to tell if the bearings are bad.