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Sickle bar mower refurbish

13436 Views 83 Replies 17 Participants Last post by  CHEVY&SEARS
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So I got these 2 mowers a few weeks ago, my ad on Craigslist really payed off. I got the 2 mowers, The Custom, the ST12, a buncha mule drives and random Sears parts and 3 3 point hitches for $400.

Model # 842.260020
Serial # 86260 and 97522

Neither of them are in working order but both are complete. As you can see in the first 2 pictures, one of them is severely twisted and broken but it's actually in better shape as far as rust goes. So all it's good parts will be switched to the other one.







The shaft and mounting assembly is much better on the twisted one, so it will be switched along with the rest of the pulleys.





Everything is coming apart surprisingly easy. This pulley came off with minimal effort with a pulley puller.



Took the arm off that makes the knives go back and forth off to make sure its crankshaft isn't frozen. It's not.







I assumed the mule drive gearbox's would have oil in them since they have a drain plug, but they don't. The grease? is hardened into a brick. Are they suppose to have gear oil in them?
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Speediet, in your second picture there's a spring to the right of the front tire. What is it for? Can you get a picture of it?
Probably 2-300 pounds. It's heavy!
Thanks, I was think of taking the bar of a horse drawn mower and hanging it underneath a GT.
ill grab a picture tomorrow for you, this weekend is/was the local Tractor Pull weekend.
ok, so that spring attaches to the frame of the mower, and keeps tension on the lifting apparatus.
However, I find my pedal hits my front wheel when the mower is in the upright position. so I have a bungee cord holding it back.

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Thanks. That explains why my lift pedal slaps the fender when I let it down.

I sharpened the knives and was able to really test it out. Works good with sharp knives! I'm not gonna use it anymore til it's on the SS18 though. The 16/6 is BLOWING smoke now. You can see the haze in the last picture.







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Looking Good! wondering how you sharpened your knifes? just a file or did you use a grinder?
Just an angle grinder. From now on i'll probably use a file, but I had to remove a thick layer of rust the first time.
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I used the sickle mower for the first good time today on the SS18! Unfortunately, i'm not too impressed. Maybe i'm asking it to cut thicker/taller grass and weeds than it was designed for but the grass that it seems to be able to handle well could be cut with a rotary mower deck...





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The knifes on that sickle look like they are made for straw. We had knifes like that on our swather and it wouldn't cut grass very well. The 8' sickle mower we used grass had serrated knives and cut way better.


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Neat pics C&S. Your engine appears to be smoking in the distant pic. Does it have a dropped valve in it or does it need rings?

My guess is it has dropped a valve.
I use mine fairly often,, I found that you need a little speed to keep the tall grass falling over kinda like a tree falling down, Too slow and mine clogged up just like you have shown. I cut mostly tall weeds and "field grass" tall wheat like stuff. I love mine though.

Vehicle Tractor Agricultural machinery Automotive wheel system Soil


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I sharpened the knives...
It looks like your knives are still dull, and that you have quite the gap between the knives and the shear fingers. It's my understanding that the sickle bar acts like 25 scissors, so the knives need to be close to the shear fingers to work properly. These are just my thoughts.
Hi C&S, as posted you need enough speed to let the cut grass etc fall back off the sickle bar, and about full throttle so the sickle is moving back and forth at a fast rate, (the IH mower call for 1700 cycles per min.). And the sickle needs more sharpening as do the lower cutter fingers and the sickle knives need to lay right on the fingers there are sickle hold down clamp to adjust it closer some have shims others are bent via a hammer. Generally a sickle will cut course stuff much better than fine grass. Good to see the pics keep working with it you'll gwt it working.
also did you lube it really good? they have to be oiled just about everytime you use them but if its too much of a problem i'll come down and pick that and the 18 up and get rid of your headache ;)
Easy on that lube or oil on the cutter bar. Lube the shoe and under the retainers that keep the section bar in place. Too much lube or oil will let SAND stick to and get in between anything that moves. That will wear the devil out of things, pronto. Keep an eye on and keeps things adjusted and wipe with oily rag at end of using but be aware of sand in between and on moving parts and joints. I grew up in S. Ga. and we had the same problem with sand as I'm sure you do in Fl.
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To be honest I judged the sickle mower before I had enough seat time to really get to know it. I completely take back what I said about it yesterday, it's awesome!! It would be a smoother operation with AGs and wheel weights but it's doing really well as is.

Speed definitely helps to keep it from bunching up. I also found that it works better to work from right to left and run over uncut grass than left to right and run over clumps off cut grass. The largest think I cut down today was a 1.5" diameter oak tree. With proper belt tension, it's unstoppable!

I did not mention the adjustments I made to the knives yesterday so here's that. When I had the mower on the 16/6 to test it out (before the SS18 was running) it bunched up grass between the knives and jammed up. I took the "hold down clips" off and bent them on the vice. This completely fixed the jamming problem.



Crappy picture, but basically the clips weren't anywhere near the knives and now they are.











Cutting the sides of trails.





Of course, since the mower worked great, something else has to break, right? The dash is crumbling even more and the clutch spring broke.



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Neat pics C&S. Your engine appears to be smoking in the distant pic. Does it have a dropped valve in it or does it need rings?

My guess is it has dropped a valve.
I'm not sure. It has 140 PSI in the cylinder which is very surprising for how much it smokes. Probably the valve guides.
The knifes on that sickle look like they are made for straw. We had knifes like that on our swather and it wouldn't cut grass very well. The 8' sickle mower we used grass had serrated knives and cut way better.


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I've heard of serrated knives for these and i'm sure they cut better but this does good enough.If they needed to be replaced i'd find serrated.
Glad to hear your it's working better, One thing to suggest, I run my engine at a fairly low rpm so as to minimize vibration and it still cuts very well,, Plus it just looks darn mean with that blade up in the air....


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