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New Holland sickle mower

grandpa Love

grandpa Love

Well-known Member
I was talking to a couple guys at church about my broken sickle bar and one of em offered to weld the plates back together. He works for a big welding,Fab shop in town. Says anything is fixable. Looks like a good job. Y'all's thoughts? Thanks.
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It will hold for a while. I would think it will crack right along his weld eventually. Those plates take the force of moving the sickle back and fort. So it also depends on how much you use it and how good of condition the sickle is kept. Plus never run a sickle mower at 540 PTO speed. They sound like they will fly apart at that speed. Keep the vibration to a minimum.
 
Lots better than my " welding". Lol! I won't be using it much. An hour or 2 a month. I'm not in the hay business,just think they are cool mowers and have always wanted one.
 
Rebuilt mine last year. NAPA has the replacement bearings. Weld looks good. I had to replace both of those pieces.
 
With out a new one to compare it to ,I guess I will put it back together and see what we have. I think I'm missing a bushing that goes in the knife bar. Maybe messicks is good place to get that ? No New Holland dealer around.
 
When you get it all back together. Out to the field you go and this is the thing I will tell you. SLOW DOWN!!!! Don't go like a bat out of heck. Mowing toooo fast shakes the daylights out of the pitmans. Take your time.
 
Lucky for me ,or unlucky, I don't have big places to work my tractors so I always go slow. Gotta make tractor time last!
 
Jeffcat this NH mower does not use a pitman. The sickle hooks to the lower hole in the brackets he is posting. The other holes are where the wobble mechanism goes that makes it stoke. Each of the pins have a roller bearing set that you adjust the preload on so there is very little free travel.
 
Messicks has almost anything you need for the NH 451, those plates take a lot of stress, having had two of the 451?s in the past I can tell you that those plates are not cheap, probably $150 each now, I have straightened them and welded them up too but those plates won?t hold up long, the constant vibration when using it will stress crack it again sooner than later and the plates will fail, good luck with it and hope it holds up a while for you, I was cutting 18 acres four times a year and around 2 fish pond edges when I had mine, they got worked a lots...
 
For you and what you do it will probably outlast you. Now for someone looking at acres and acres of hay with only a 3-4 day window of good weather, its probably not worth the risk or frustration. Looks like he did you a good job. gobble
 
Hey traditional farmer, I'm guessing I need 1? All the parts came in a bucket so I don't even know what is missing. I think the bushing and bolt that hold knife is missing. Shoot me an email if you have some you want to get rid of. Thanks i use classic view on here.
 
I keep saying pitman from old school. Fourty years ago on the farm. OK Wobble, what ever it is today. I am looking at all of the ware on those plated and have to wonder how high of a pto speed they were run at. Just like my neighbor across the street with his JD garden tractor. Runs the engine full tilt. Just can't stand hearing machines screaming. The first mower my dad had was a tow behing New Idea. Stuck in my head pitman arm. The next mower was a IH balanced head. No pitman. Then a New Holand haybine. Any of them you can pound the gramm crackers out of. Just the way I handle equipment. Now the guy who rents the fields he was showing me his Gehil disk mower. He can go as fast as the tractor has power to run it. Lightnig fast to fourty years ago
 
Not affiliated with this shop - just south of Lancaster, PA - beautiful country! Good experiences dealing with them.

http://www.lancasterfarming.com/joe-s-machinery-llc-parts-catalog/pdf_445fe51c-e7c2-11e5-9484-1b797b300e94.html

Parts catalog online - may take a few minutes to load. Parts for NH mowers and some other equipment.

See page 8 for those parts!
 
I ran those pitmanless NH mowers for years. Best thing I ever did was retire it and buy a good old used NH 479 haybine. Difference of night and day in the cutting capacity. Haybine knife runs way faster and does not rattle and complain like the mower. Not sure, think I might have plugged the knife once in the years I've had the haybine. On the mowers it was a daily occurence. Broken guards from cutting through mole hills. Way less trouble with the haybine as it has floatation and can run the cutterbar above ground level.
 
Back 50-55 years ago mowing hay with Dad's worn-out Oliver sickle mower behind the 1939 H the mower ran at 540+ RPM all the time to get the mph. In '68 with the stage II Super H I ran around 1500 engine rpm, 490-500 pto rpm, which was just shy of 6 mph in 4th.

Some jobs I got hollared at for NOT running wide open, and the jobs I did run wide open I never heard a complaint.
 
The knife bolt needs to be torqued at 90 ft lbs. That hole worn slotted tells me that the knife bolt was not tight and was ran that way for awhile. The repaired hole should be chamfered on the outer edges of each plate so it will mate well with the bevel on the knife bolt and nut. Alignment is critical on that thing - it changes direction several times a second. I hope it works good for you. Those are nice mowers.
 
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