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Discussion Forum

JD 4520 Clutch

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Matt

06-25-2003 20:48:18




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Hello. I'm having a serious problem with a clutch off a John Deere 4520 with a Syncro Range transmission. Recently one of the "straps" broke that pulls the pressure plate off the clutch, so we split the tractor (kinda big undertaking!) and pulled the clutch off. We replaced the clutch (even though it was only worn a few thousanths) and replaced all the springs and straps. We also installed a new throwout bearing that is identical to the old one in everyway. Put the clutch back on, made all the proper adjustments so that everything will work smoothly...slid the tractor back together, started it and went to move it and the gears ground. So we got to looking and discovered the bearing doesn't even touch the clutch when the pedal is depressed. So we adjusted the pedal...now the bearing travels as far as john deere made it, but its still barely touching the release fingers. I've also noticed they're out of adjustment again. What happened here, and what can I do to fix it? I really wanna get this thing out and about. Thanks for your time!

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Jim

06-26-2003 07:00:53




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 Re: JD 4520 Clutch in reply to Matt, 06-25-2003 20:48:18  
I rebuilt a 4520 clutch and it didn't work. What we found was we had put in the wrong straps. There are several straps to allow for machining of the plates.



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Jon Hagen

06-25-2003 21:52:25




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 Re: JD 4520 Clutch in reply to Matt, 06-25-2003 20:48:18  
Have worked on my 4020 clutch that is very similar to yours. To get a good working,properly adjusted clutch you need to assemble the whole clutch assy in the flywheel and adjust the clutch fingers with the JD guage tool. Any wear on pins or fingers will cause the finger adjustment to change as the pins rotate. I ended up removing the flywheel from the engine and hauled the whole flywheel/discs/clutch assy to the local JD dealer where a mechanic with a lot of experience on this job did the final clutch finger adjustment on the tailgate of my pickup. Punch marked flywheel and clutch cover so everything went back on the engine in the exact same position and had a good working clutch.

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