Tip & How-To about Miscellaneous

Riding Lawnmower mandrels.

There is something to be said for being frugal and only replacing a failed part. But when you have 2 or 3 blade mandrels you are replacing a mass produced part with another that looks identical.` Later another identical part fails and you do not know which mandrel was replaced earlier.

You need to mark each replacement mandrel in a way that does not wear off. Painting the new part is not a lasting method. You can place a notch in a cooling fin or drill a small hole in a cooling fin to identify the newer part.

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I think that I over tightened the lock nut on one side (not using a tort wrench) after changing the mowing blades. I don't think it is cutting now. When I take the blades off from cutting, one blade just spends. Is there any to fix this problem?


there is a star shaped, or other, pattern on the bottom of the mandrel which fixes it into the blade. this has stripped so the blade is freewheeling on the mandrel. if you cannot remove the blade bolt, I think you are going to have to remove the deck and take it to a fabrication or machine shop to have them remove the blade from the mandrel. then you buy a new mandrel and a new blade, at a small engine repair shop, put it back together. take a picture of the top of the deck before you remove the deck belt so you know how to put it back on after you have the new mandrel bolted in. if it is old you may just want to replace all the mandrels while you are at it. they are less than 50 bucks each.

Aug 24, 2011 | Toro Garden

1 Answer

I think I hit a hidden tree root and there is nowa terrible noise from the blades. The one blade (RHS) seems loose and I just do not know what to do to tighten it. Can you help please.


The blade attaches to the bottom of the mandrel, which has a pulley on top driven by the deck belt, and there is a part in there which failed when the immoveable object met the irresistable force. So you may well have to take the deck off, remove and replace the mandrel, or a key on the bottom of the mandrel or buy a new blade. In any there is not a quick fix for this situation, some mechanical repair work has to be done.

Aug 09, 2010 | Garden

1 Answer

one blade cuts and one doesn't. Is this a pulley or a belt problem?drive belt sound hasn't changed. can belts be adjusted or only replaced? what tools are needed?


Set the thing up on some blocks and try to remove the blade which does not turn. Since your belt is working, the pulley must be spinning or there would briefly be an awful racket. If the pulley is spinning but the blade is not then there is something wrong with the mandrel/spindle, or the blade has come loose and has somehow not cut off anyone's foot. Sometimes the pulley and top of the mandrel become rounded out but again there would be some metal on metal noise. Often there is a star shaped protrusion on the bottom of the mandrel which locks into the blade and by virtue of hitting some immovable object, that unstoppable keeper has been destroyed.

Jun 25, 2010 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

1 Answer

blades making a bad noise


Well I would say you have a bent blade, a blade has a loose connection to the bottom of the mandrel, or a mandrel bearing is going out. Visual inspection will reveal much, just look under the deck. A bad mandrel may appear to have "runout" when viewed from the top while spinning as contrasted with a good mandrel. Viewing the one in the center while deck is working is going to be a challenge. If you decide to replace a mandrel, do yourself a favor and take a picture of the deck belt before you take it off so you know how it goes back on.

Jun 03, 2010 | Husqvarna Lawn Tractor 48" Deck, 23 Hp,...

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