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NH 1431 cutter bar flex
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EarlJay
Posted 9/1/2016 12:49 (#5503350)
Subject: NH 1431 cutter bar flex


Southern Ohio
I bought this mower last year and have only cut maybe 70 or 80 acres total the past two years. It's my first discmower of any sort so I'm pretty ignorant about them. I noticed I've got some flex in the bar about a third of the way in from the right side and some knives want to touch the bar now. Do I have something broke in there causing this flex or do I have junk mower now?
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ntexcotton
Posted 9/1/2016 15:36 (#5503535 - in reply to #5503350)
Subject: RE: NH 1431 cutter bar flex


North Central Texas
Check the bolts (26) at the sag. They need to be really tight. Rock guard comes off to get easier access to the front. May also want to look at the dowel pins (30) and the holes they fit into.

Edited by ntexcotton 9/1/2016 15:37




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RickB
Posted 9/1/2016 16:25 (#5503582 - in reply to #5503535)
Subject: RE: NH 1431 cutter bar flex



Lincoln County. NC
Tie Bolt torque is 150 lb/ft then 1 full turn.
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EarlJay
Posted 9/1/2016 18:05 (#5503701 - in reply to #5503350)
Subject: RE: NH 1431 cutter bar flex


Southern Ohio
I'll give that a try and see what happens
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mike10
Posted 9/1/2016 19:50 (#5503916 - in reply to #5503701)
Subject: RE: NH 1431 cutter bar flex


Originally the spec was 50 ft/lbs torque plus one full turn or 6 flats. The latest spec is oil the threads with 80-90 oil, torque to 50 ft/lbs plus turn the nuts 5 flats. I split the difference and oil the threads and turn the nuts an additional 5 1/2 flats.

With the head latched up, run a string from one side to the other. The max sag should be 3/4" in the middle. With the head on the ground the max sag should be 1/2" in the middle. Cutterbars since 2005 have had stepped spacers to correct the sag. For prior models there was a shim kit available to correct the sag if the sag was out of specs.
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dale8670
Posted 9/1/2016 20:52 (#5504126 - in reply to #5503350)
Subject: RE: NH 1431 cutter bar flex


SE Iowa
If the bolts are loose I would take it apart and check the drive shaft (22) between the two turtles running at an angle like that will wear them out fast. I had the same problem when I dropped the mower off the road getting over for a car, broke one of the bolts and didn't know it till like your started to hear the blades hit. Lucky new shafts and bolts fixed mine. Your going to need the special tool to tighten them. My dealer let me borrow theirs.
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