Jumpy clutch

DanH · Aug 24, 2015

Having some problems with a jumpy clutch . I have a JD 620 I replaced the clutch and disks last year. I have adjusted it since then but in the hire gears 4,5and 6 gear are really jumpy. What should I do to help this issue ?

Thanks Dan

RLA · Aug 24, 2015

2 items are my list I have always checked first for jumpy clutch's.

Pulley support bearing, make sure it's in good shape. No up & down movement on pulley.

Drive pin on operating collar, make sure the hole isn't egg shaped.

Other than that , glazed linings. or worn/ seized up adjusting bolts.
I own about 10 of these & no 2 are identical in operation.

Jumpy is not good.....

Larry Davis · Aug 24, 2015

It is possible that the spring steel washers R21647 that go under the slotted nuts of the
clutch operating bolts could smooth your clutch if everything else checks out.
I hope these washers are still available from Deere as I have had good luck
using them on my 520.
Good luck.
Larry D

Sberry · Aug 24, 2015

Did you use a reman pressure plate? I did one for a neighbor I regret using the stuff he brought, should have used the old one and just changed the disk. Many auto parts stores have a line on new at a great price.

Pete in MD · Aug 24, 2015

Pressure plate on a 2 cylinder??

jeo46 · Aug 24, 2015

Use R21647 washers under slotted adjustment nuts (3).It worked for me-clutch on my 620 works smoothly.

buickanddeere · Aug 24, 2015

(quoted from post at 18:57:41 08/24/15) Pressure plate on a 2 cylinder??

Thinking that too.

buickanddeere · Aug 24, 2015

What is the crank endplay set at ?

BushogPapa · Aug 24, 2015

Take the Cover off the clutch and give it a really GOOD Dusting of Dry Graphite...

My 520 needs a dose twice a Year.. (I drilled a small hole in the Cover, to make it easy..)

Do not worry, the Clutch will NOT slip...

Ron..

Sberry · Aug 25, 2015

Yes, after the fact I see its a different tractor. We are so used to hearing about this that its a reaction.

Mike M · Aug 25, 2015

Getting the slop out of the linkage will help. I also take all the metal clutch plates I can remove and hit them with a sandblaster to deglaze them.

IaLeo · Aug 25, 2015

Trade it for a Case hand clutch!

Run both back in the day. Don't try standing on the ground behind the thing backing it up to hook up a wagon. And with the Case you won't have to put the tractor in neutral and engaging the clutch just to keep the first reduction gears lubricating the pulley/crankshaft bearings. Our new '51 B had no better handling of 2-16's in sod than the worn '40 SC case had been doing for years. Of, course the B creeper 1st gear gave it a bit of an edge if you could get traction and a lot more "fuss". Never forgave dad for not getting a new SC. IaLeo

Jumpy clutch

DanH

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RLA

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Larry Davis

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Sberry

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Pete in MD

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jeo46

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buickanddeere

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buickanddeere

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BushogPapa

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Sberry

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Mike M

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IaLeo

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