Go BottomNon-release clutch on JD 970 after two weeks of non-use
 | george, keoke
Join Date: Posts: 1 
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2000-08-21 19025
Unless I block my clutch pedal down the clutch plates will rust up and lock on to the pressure plates when tractor sits for two weeks or more. Does anyone else out there with JD 70 series tractors have the same problem?????This is not a humidity problem (20%)with clutch linnings swelling up and rusting. Could it be that JD used a heavy metallic type of linning and the wire strands are rusting up very quickly????Ironically the JD owners manual says nothing about blocking down the clutch pedal during long periods of non-use. I had a Ford 1920 before the JD and they even had a pic in the manual on how to block the clutch. I am just trying to get a fix on whether this porblem is unique to my tractor or if it is a common one with the 70 series tractors.Regards,george, keoke
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| Halsey Green
Join Date: Posts: 1
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2000-08-21 19030
In the operators manual for my John Deere 790 they reference blocking down the clutch petal for extended storage (like months, they even have a kit with rust preventative to be used for prep for storage). They even have a metal oblong ring that slips over a protrusion on the clutch petal and foot board for the sole purpose of locking the clutch petal down. I guess you could block the clutch anytime you parked. Hope this helps.
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2000-08-21 19033
As Halsey says, it is a known problem and not restricted to JDs - or for that matter to compacts. And again as he says, some tractors provide a latch ring for the clutch pedal. Talk about locking the barn after the horse is out! On the other hand, I've seen and heard about this happening in other parts of the country, but it is very rare to have it happen in the arid West. so maybe moisture is the cause. I wonder if cars have this problem, too? ....
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| Bird Senter
Join Date: Jun 1999 Posts: 962 
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2000-08-21 19048
This is interesting because I hadn't heard of it happening since the early '50s when our 1938-40 John Deere did it. ....
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| bud in oh.
Join Date: Posts: 1
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2000-08-21 19051
George, I owned a 970 before I bought my 4600 and at 1000 hrs I never had a problem. But the new owner only uses it once in a while and he left it parked out side after he received it and the clutch stuck. I and my brother went to his place to try and get it to release with no luck. My brother being a Deere mechanic was gonna split the tractor until he remembered the little screen on the right side of the tranny. He stuck a long screw driver in and just applied a little leverage and it popped right loose. I don't know if you are having a problem getting yours broke loose but if you do this might save alot of work. My bother said the 50 series used to be shipped with a block of wood to hold the clutch in since they had alot of problems with sticking clutches, but he never had a problem with the 70 series until my old 970 did it. budinohio ....
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| george, keoke
Join Date: Posts: 1
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2000-08-21 19053
Hey guys, here is an interesting question. Will blocking the clutch pedal down while tractor is stored weaken the pressure plate springs? As you know, these springs will remain fully compressed while clutch pedal is depressed. Question is, will they return to full strength after being held in this position for a extended periods of time??
Regards,
george, keoke ....
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2000-08-22 19055
The answer is that they will loose a little strength...but not much. In order for them to loose any rebound when compressed they have to stay that way long enough for the inter-metallic bonds to re-order themselves. They need time to "flow". Without any outside energy like vibration or heat cycling this is flowing is a very slow process. As an example, an overloaded truck with the springs compressed will loose spring strength pretty rapidly if you drive it over lots of bumpy roads, but park it instead of driving it and the process takes years. Or consider the valve springs in your engine. Everytime that you stop the engine, several of those springs sit compressed - sometimes for long periods of time. But "flat" valve springs are something that you rarely see.
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