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Implement Alley Discussion Forum

NH 450 sickle bar mower-lift spring adjustment

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Grass Roots Far

05-22-2009 06:05:12

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I am unclear about the adjustment of the lift spring and the cable. Is the lift spring used to "unweight" the cutter bar, so that there is not so much drag on the outer shoe?

Also, when the sickle bar is in operation, do both shoes skid along the ground with balanced weight on each?

I am trying to figure out if the breaking of the knife head and sickle blade was because this cable was not adjusted properly.


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Dwayne Berry

05-22-2009 07:30:43

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 Re: NH 450 sickle bar mower-lift spring adjustment in reply to thurlow, 05-22-2009 06:05:12  
Yes, both shoes should be riding along the ground. There should be adjustments on both inner and outer shoe to obtain the desired cut height. The top link should be adjusted so the guards have a slight upward tilt in front for rocky uneven soil and more level for nice smooth fields.

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05-22-2009 06:46:59

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 Re: NH 450 sickle bar mower-lift spring adjustment in reply to Grass Roots Farmer, 05-22-2009 06:05:12  
I think you have the spring figured out pretty well.

The breaking of the knife "head" or "back" isn't related to the spring at all.

Are the "wear plates" in good condition and are the hold down clips on good shape and bent down near the knife?

(Even when EVERYTHING is in good condition and set up correctly a knife or knife head will occasionally fatigue and break.)

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