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Replacing mower teeth?

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Lowell Davis

10-31-2001 16:32:14




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Hello -

How do you replace sickle bar mower teeth? I have a Cub-22 mower with a broken tooth. Could probably stand to replace them all. CT Farm and Country sells packages of several individual teeth with the rivets. What's the technique for removing the old rivets and then attaching the new ones?

Thanks!




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TomH

11-01-2001 16:30:19




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 Re: Replacing mower teeth? in reply to Lowell Davis, 10-31-2001 16:32:14  
The grinder/punch technique works, but its not the best because you can enlarge the hole by driving the punch through it. It's also slower than shearing the rivets off.

I put the knife in a vise with the jaws open just wide enough for the section to slide in, so the knife bar (the piece that the sections are riveted to) sits on the top of the vise jaw. Back of the section should be up (pointed end down). Then take about a 2 lb sledge hammer and whack the back of the section. You'll expect to break the knife every time, but it never happens, the rivets shear right off. Once you get up the nerve to hit it hard enough you'll knock the section off with one hit.

I like bolts better, but rivets work fine if it isn't a hassle to remove the knife from the mower.

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Wayne-MN

11-01-2001 15:19:57




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 Re: Replacing mower teeth? in reply to Lowell Davis, 10-31-2001 16:32:14  
Bolt on knives are the way to go. You can change 'em out in the field with out removing the sickle. Just make sure you have clearance on the knife clip for the bolt heads.

Wayne



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paul

11-01-2001 08:25:36




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 Re: Replacing mower teeth? in reply to Lowell Davis, 10-31-2001 16:32:14  
It may be cheaper to just buy a new sickle, if you need to replace all the sections. Also, look at your guards (ledger plates), they are often wore down as well if the sickle is in bad shape. This is the other 1/2 of the sissors action and is just as important as the sickle sections.

I like the bolts too.

On the combine, I take off a guard, angle grind the rivet heads off, puunch out, bolt a section back in, bolt the guard back on, and back in business in a couple minutes. Darn rocks.

--->Paul

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jim

11-01-2001 06:18:24




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 Re: Replacing mower teeth? in reply to Lowell Davis, 10-31-2001 16:32:14  
Once you have removed the broken sections, don't bother to re-rivet the new ones. When you purchase the replacement sections , pick up a box of the new style bolts which replace rivets. Then when you break a section ,you don't need to remove the bar, just unfasten the nuts and replace with a new section. Much faster and just as dependable as the old rivet method.



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Joe

10-31-2001 17:09:46




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 Re: Replacing mower teeth? in reply to Lowell Davis, 10-31-2001 16:32:14  
On my Allis-Chalmers sickle bar mower I simply remove the upper finger guards and take out the entire bar. When you flip it over the bottoms of the rivets are exposed. Depending on how flattened or worn the bottoms are you can simply pound them out using a punch and a hammer. If they are very flat or worn, you will need to take a chisel and neaten the edges of the rivet up or try to take the flattened areas off so that it can be punched back through. If the teeth were replaced properly with the right rivets etcetera before then you won't have much trouble. If it was a poorly done job with the wrong parts then you may have to pull out the grinder to take them off. Be careful to not damage the edges of the rivet hole itself though if you have to do this. You might have trouble getting the rivets to hold properly if you accidentally do this. To put the new rivets back in, simply have the bar on its back with the head of the rivet on a hard surface. The bottom of the rivet should protrude slightly from the bottom of the bar. Use a ball-pean hammer and easily tap the rivet ends poking through into an even, flattened head enough that the rivets won't work themselves out. Then your done. Good luck.....

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Bigdog

10-31-2001 16:58:04




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 Re: Replacing mower teeth? in reply to Lowell Davis, 10-31-2001 16:32:14  
We used to lay the sickle bar on a vise with the jaws open just enough to clear the heads of the rivets. Then using a hammer & punch, drive the rivets out from the bottom (bar side, not the section side). To replace the sections, just place the 2 rivets through the section and then the bar. Round of the ends of the rivets with a ball peen hammer using the vice as an anvil surface against the head of the rivets. It goes much quicker if you have someone to hold & move the sickle bar across the vise.

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Johnny in E.Tx

10-31-2001 17:13:41




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 Re: Re: Replacing mower teeth? in reply to Bigdog, 10-31-2001 16:58:04  
I just turn the sickle with the points facing down and rest the bar against something solid, like a vice or the edge of the flatbed of my pickup, and hit the backside of the section with a 2 lb. sledge and it usually shears right off. Then install your new section like Bigdog says. I can replace one in under a minute. I don't even use a punch or chisel unless the half rivet left in the bar is a little swedged.

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Murphy

10-31-2001 18:06:35




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 Re: Re: Re: Replacing mower teeth? in reply to Johnny in E.Tx, 10-31-2001 17:13:41  
I have replaced thousands of knives over the years and Johnny is right about how to do it. There is no need to make it any harder than it really is. You can also place the cutter bar knife section down in a loose fitting vise to pound them out. Good luck.



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