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Sickle mower

S

SVcummins

Well-known Member
What?s a good way to straighten a sickle mower cutter bar?
a249086.jpg
 
Take it to your local blacksmith who has a press and understands metal. Anything else is gonna be a headache.
 
i placed block under the ends and drove over it with my big tractor. dont think it was bent as bad as that one to
 
I had a welding shop and straigtened a lot of them. I would block up the roller chains on a forklift so that I could get down pressure and put wood blocks near each end and a block a bit lower under the bend to insure that it would not bend too fat in the opposite direction. It would take several attempts to get it back to original shape. I do not know if it retained the straightness in use.
 
I've straightened two - 65 years ago.
Took the guards off, and used a shop press.

Rebend it a little beyond straight - maybe an inch - it'll creep back a little
over several days following restraightening.

The knife can tolerate a little bend without too much chatter.
 
good morning sv, I agree with donjr, remove the cutter bar, strip it down, guards knife, put a wood block at each end, measure the height at both ends and find the highest point on the bar, place your hydraulic jack there, under the bar at that point place another block just slightly lower, 1/8 to 1/4", jack up the chain until you've got some pressure on the chain, then start heating the bar working both ways from the jack, (DO'S NOT HAVE TO BE RED HOT) just use a propane tiger torch or cutting torch with a heating torch end, when you've got it getting warm start jacking slowly one stroke at a time and keep heating as your going until you've got it down to the block under the jack. remove the heat and let it sit. watch the ends don't lift off the 2 end blocks, adjust jack to keep the bar on all 3 blocks let it cool to room temp. there is an old saying in the blacksmith world sv that "there is room in hell for a cold iron blacksmith" good luck and let us know how you make out.
 
sv. when your heating the bar work your torch from the jack both ways from the jack to the ends of the bar in an even pace, the key to this is patience sv. take your time.
 
(quoted from post at 18:23:02 12/02/17) DO NOT HEAT IT.
Click to expand...

Why not? Heat should not cause a problem unless you are doing it in the tall grass or you "quench" it which would make it brittle
 
Looks like more of a parts machine, see how tight the flywheel is on the shaft, I didn't care for the model of JD.
 
(quoted from post at 18:23:02 12/02/17) DO NOT HEAT IT.
Click to expand...
brutus, when I talk about heating it I'm saying to gradually heat it up slowly, the molecules in the iron will want to return to their original shape before it was bent, slowly cooling down back to room or ambient temp while monitoring with a straight edge and slowly releasing the jack tension as it cools to keep it level. bending it cold will take a lot more jack pressure with the risk of breaking the bar.
 
I made one run in a lot worse shape than this and it didn?t take a whole lot of work to do it either so I will fix this one two and next summer I?ll post pics of it cutting hay flywheel is tight and the gear box is tight
 
The cutter bar is the same as a number 5 mower. Find a parts unit and grab the bar.
 
Ya it?s got a bend right in the middle looks easy to get and then I?ll put it in my press and press er straight I think I might try the chain and jack trick with a little heat also either way the knife and guards will come off because as rusty as this they will need replaced before it will ever cut anything anyway
 
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