1957 jd 420c

Tim Snow · Post by **Tim Snow** » Thu Aug 25, 2005 9:39 am

just replaced throwout bearing and sleeve for my crawler this 420c was a gift from a dead friends family i never saw it run however shes a fine runner she shifts great problem is under a good size load pushing she will stop the motor stays running, still in gear, but the tracks stop is the problem with the sterring clutches when i get her all cleaned up lots of surface rust ill forward pics. thanks Tim

Post by **Lavoy** » Thu Aug 25, 2005 3:08 pm

No way to diagnose without more info. It could be either one or both of the scenarios you listed.
Are all of the clutches adjusted correctly?
When you had it split, did you check the engine clutch?
Lavoy

Tim Snow · Post by **Tim Snow** » Mon Aug 29, 2005 5:36 am

Lavoy, over the weekend i split the tractor again, this time paying more attention to the clutch and plate. the disk looks great but the pressure plate springs seem a little loose there is play on all the springs, could this be the reason the machines track stop under a decent size load thanks Tim

Post by **Lavoy** » Mon Aug 29, 2005 8:49 am

That sounds very suspicious. Once the pressure plate is bolted down, the springs should be so tight that there is no way you could wiggle them at all. Look closely, sometimes the springs will be broken.
Lavoy

Tim Snow · Post by **Tim Snow** » Wed Aug 31, 2005 6:19 am

thankyou lavoy, after checking the pressure plate i found that all three of the finger springs had lost tention one more than the other two i am able to push them in with using my fingers. next question can the springs be replaced or do i need a complete pressure plate whatever the case im sure you have the pieces thanks again Tim

Jimmy in NC · Post by **Jimmy in NC** » Wed Aug 31, 2005 6:51 am

Tim-

Personally I'd replace it. Do you really want to go back through the whole pulling the motor again. What's a little bit more money and the same labor. I'm not 100% sure but I don't think they are that much and I'm pretty sure Lavoy can set you up. I'd probably do a disk and the whole works actually. Been my experience with my 420, anything I don't pay real good attention to, will come back to haunt me.

Just my humble $.02

Jimmy in NC

Post by **Lavoy** » Wed Aug 31, 2005 9:01 am

Tim,
Springs themselves are no longer available.
I have rebuilt pressure plates on hand, as well as clutch disc and throwout bearing.
Lavoy

Tim Snow · Post by **Tim Snow** » Wed Oct 12, 2005 7:45 am

Lavoy, as promised the pressure plate arrived yesterday Oct. 11, Again thankyou for all you help. The guage you sent will help me, when one doesnt do this stuff everyday its a great feeling that you offer your expertise. thanks for being there...once this is together and painted i'll send pics Tim

Tim Snow · Post by **Tim Snow** » Mon Oct 24, 2005 5:05 am

Lavoy, finally this weekend i got around to installing the pressure plate you sent. and im happy to confirm that the 420 is working as designed.
She pushes nicely, only problem now is getting to all the jobs around the farm that needs to be done. thanks again for all your support and all the 420 guys out there that render assistance Tim

Tim Snow · Post by **Tim Snow** » Mon Oct 31, 2005 7:19 am

Lavoy, well.. this weekend i was able to put the 420 through the paces around the farm. she performed well for the first couple of hours. as i was working i noticed that she would push but she started to slip again. I am a little concerned with the clutch disk now its fibre and looked great when i split her. i dont mind breaking her down i getting real good and fast at it. now am certain i should have got the whole clutch kit from you let there be a lasson here. I was able to find that the steering clutches would not turn when she slipped thus making me believe its the engine clutch. Like i said i dont mind splitting her again i learning all kinds of things and besides this keeps me from the HONEY DO list. So i think im in the market for a new disk. Ill call this morning. Thanks Tim

Post by **Lavoy** » Mon Oct 31, 2005 8:26 am

Did you set the fingers on the pressure plate with the gauge I sent you? If so, I think it is not the engine clutch.
Do you have enough free play in the clutch pedal?
Double check and make sure that it is not the steering clutches slipping instead.
Lavoy

Tim Snow · Post by **Tim Snow** » Thu Nov 10, 2005 6:21 am

Lavoy.. just to update you on my issue. After splitting the 420 muliple times over the weekend i was determined to find the slip. Wife was away so i had no distractions. I installed a new clutch disk, along with the new pressure plate i got from you. Did you know that a 1949 ford disk is exactly the same. I can now split this thing with my eyes closed. however I took special care on alignment and adjustment. moreso than the backyard farmer way. i removed all the bailing wire used as cotter pins and on my last try i was very impressed that the trial run proved satifactory. I am pleased to announce that the 420 is delivering performance just fine. Your help has been greatly apprechiated and look forward to your advice on OTHER issues. Thanks again Tim

Tim Snow · Post by **Tim Snow** » Tue Jan 10, 2006 6:09 am

May i start by wishing everyone a proserous and happy new year. Let me tell you all im having so much fun with my 420. my son in law is rebuilding a 79cj7 we bought a 360cu in wagoneer the best way to pull the sheetmetal and motor yep the 420 saves loads of time and gets everything out of the way fast. loading the trailer with cars for recycle is also a pleasure. when the warm weather breaks i need to spend some time on making her pretty. i will forward pics when done Tim

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