JD 4240 Seat Position Cylinder

FWB in SK · Feb 24, 2020

Cylinder leaking at bottom seam where joins casting. Would JB Weld work or could this be brazed or welded. Cylinder is pressed on where it joins casting. John Deere wants $1000. for this new.

Tony in SD · Feb 25, 2020

Not sure if JBWeld would work but I would be worried about the heat of welding or brazing warping the cylinder. I would Take it to a shop that is a specialist in cylinders and hydraulics

SVcummins · Feb 25, 2020

For a thousand bucks I bet you could put an air seat in it

Tx Jim · Feb 25, 2020

I think 2250 psi is more pressure than J-B will sustain. I think one can weld cylinder by having piston at opposite end of cylinder from welding & having cylinder disconnected from control housing.

Your JD dealer must be greedier than some JD dealers.
AR79172 Cylinder $691.73

72supr · Feb 25, 2020

I replaced one on my 4440 ten years ago and at that time it was $425.00 bucks.I checked in on welding it and was told it couldn t be fixed.Did not help you much but maybe you ll have better luck than I.

Steve@Advance · Feb 25, 2020

Can you determine what the base is made of?

If ductile iron or forged steel, yes it can be welded.

If cast, maybe someone familiar with welding or brazing could fix it.

At this point nothing to loose by trying.

Mike M · Feb 25, 2020

Tig welding mat be a better option. Find a good welder.

tim s · Feb 25, 2020

JB weld is god stuff but not there,, I would weld it,,the seat works off low pressure.

matthies · Feb 25, 2020

$1000 in NE Nebraska.

Tx Jim · Feb 25, 2020

(quoted from post at 07:52:21 02/25/20) the seat works off low pressure.

Tim
Thanks for correction about my mistake stating seat utilized high pressure.
Jim

Bob · Feb 25, 2020

More than likely, there's an O-ring in there that the tube was crimped down on.

If that's the case, you will be dealing with smudged, cooked O-ring goo if you try to weld it.

Blackhole49 · Feb 25, 2020

Google it, All State Ag Parts list them for $237 used with warranty.

FWB in SK · Feb 25, 2020

Thanks for all replies. Cost is $1050. Canadian. Can get s used one for $300. Don't know yet,what I will do. will post final result.

caterpillar guy · Feb 25, 2020

Warm the casting and weld with the wire welder less heat build up from the smaller wire versus the much bigger rod and let cool slowly will work fine. Bot out anything if it doesn't hold or seal.

JD 4240 Seat Position Cylinder

FWB in SK

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Tony in SD

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SVcummins

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Tx Jim

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72supr

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Steve@Advance

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Mike M

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tim s

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matthies

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Tx Jim

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Bob

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Blackhole49

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FWB in SK

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caterpillar guy

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