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JD 7520 clutch

7

7520619

Member
Our old 1974 7520 clutch starting acting up yesterday. It's not engaging when you step on it. I'm guessing it's either pressure plate or throw out bearing. There is a spot where the clutch pedal vibrates slightly and then past that nothing. How hard is it to spilt one of these? Could a guy use a bobcat under the front and roll it ahead and just put railroad ties under the back section? It's setting in a fairly soft pasture and stands won't work. I've read where guys have used a forklift but was wondering if a skidsteer with forks would do the same.
 
Before you do anything get it to someplace hard and level.you need a lot of cribbing,several jacks and something bigger than a skid steer. Skid steer may bring the front off but I doubt it will safely and accurately hold the engine to remove it or reinstall it.Fuel tanks need to be drained and removed along with all the sheet metal. Beg or borrow a manual, it is not an easy job and can be dangerous without the proper tools blocks and experience.It it took 2 of us almost 30 hours which included changing fluids drying up some leaks,and changing out the camshaft and oilpump drive which were severely worn(I would suggest looking at yours while apart)We used a telehandler to remove and install the engine as it can be tilted,turned and minutely adjusted to realign the engine going back in.
 
Does the engine have to come completely out? I thought a guy could just unbolt the engine and roll the whole assembly forward.
 
Stepping on it should disengage it ? Put the tranny in TOW position and tow it to somewhere that has a concrete floor to work on. You will be a lot happier. Also borrow or build some stands to support the front half. Then you can roll the back half away on a heavy floor jack.
 
My bad. I thought I saw 4520 not a 7520. I never did one of those. So I don't know how those come apart ? But getting it to a nice place to work certainly applies.
 
Wonder if the clutch disk just is stuck to the flywheel ? If you are like we are it is VERY wet and that might of rusted it fast.
 
Good point! I never thought of that. It always sits outside and this was the first we started it this spring. It was fine when we parked it last fall. There is one spot (about half clutch) that it vibrated just a little but after that nothing.
 
No way I would attempt that in the field.

Getting it apart would not be too hard.

It's getting the transmission splined back in that would be a real challenge.

Poor alignment results in having to use force and/or the weight of the front assembly hanging on the clutch disc. This can easily damage the new clutch or other components, resulting in a new clutch ruined or not working once it is back together.

At least drag it to a paved surface or preferably a slab so you will have safe control of the weight.
 
I have changed them here in the shop,,roll the engine in the front half together, yes it is an ornery job,,it has 2 clutch disc in it,,and it does sound like one is hung up,, I would put it in gear with the engine off, depress the clutch pedal and drag it around a bit with another tractor to try freeing it up.
 
I have freed up stuck ones on small tractors by getting them running in gear and while pedal is held down alternate pushing on one brake at a time.
If there is any access point to see clutch while it is shut off and pedal held down or blocked down try and wiggle on the disc with a pry bar or screwdriver.
Block clutch down and maybe with weather changes come back later and see if it freed up ?
 
Update: Took the inspection cover off...about a quart of water ran out. Everything appeared to be working normally. Tried starting it in gear and applying brakes. Didn't break loose. Hooked up to our 28' disc and socked it in the ground while simultaneously applying brake as hard as possible. Had the engine wide open when we started. After maxing out the disc and with brakes fully applied, the clutch finally broke loose just before the engine died. Man it's hard to believe that a little rust can be that tough. The tractor has a very healthy 619 out of an 8640 and it took every bit of the 280 hp it makes to break it loose. Thanks for the helpful suggestions.
 
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JoeM(GA)
JoeM(GA)
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