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JD 4420 Combine Brakes

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Paul swpa

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Had a little issue with someone(me) forgetting to take the park brake off last day harvesting last fall till too late and didn't have brakes coming back in to the shed. Well, maybe had a little but couldn't really trust them. Just getting around to working on them now. Checked the movement of the plate the slave cylinders push and is within the spec called for in the manual, however the pedals are pretty soft and go almost to floor. Park brake measures good too, but is at the end of adjustment on the lever knob. Does this all mean it's time for new brake discs? Priced the JD discs around $122 each (x4), but saw the A&I discs are around $20 each, is there a big difference in them? Anyone have experience with the A&I Parts or All Parts products?
Ran the combine back and forth in the big shed today (was raining), and seemed to have some brake, but it's not like getting out in the field on a grade and needing to stop.
 
Are the disc wore out or just glazed over? I have ruffed up many of those and put back on. I will say that's the one flaw in those machines.
 
4520bw, I guess you could say that is the base part of my question. Is there a way to tell if the discs are wore out without getting them apart? Just going by the movement measured of the plate? I think tomorrow I will try the adjusting nut on top of the plate, just hope I don't get them to the point they drag and heat up again. See what that does to the spec measurement. I have ruffed up many similar discs for the Farmalls we run in the past so not all that unfamiliar with them. Just looks like a real pain to get in the drums on this one. Shafts look like they have never been off since it was new, pins look pretty tight.
 
I have been spraying stuff with some PB Blaster intermittently all spring anticipating having to get the drums off. Worked at the adjustment nuts on top of the actuating plate today. Down to the minimum movement according to the manual, didn't improve things much. Monday looks like tear down day, see what the discs look like. Don't want to have to do it in the middle of harvest if they go out totally.
 
Let us know what you find. Now that I think about it I tore one apart and the balls that spread the pads were rusted and stuck not allowing anything to move. If you're got hot they may have gualed.
 
I wouldn't buy anything from a&i unless it wasn't available anywhere else. Pretty much everything they sell is complete crap.
 
The right side got hot enough the dust was glowing, had to douse with water to keep from starting a fire. Good thing I was close home and the pond to get water. We had been having some trouble with the idlers on the rotary screen fan locking up and I thought the smell was coming from the belt, never thought to look at the park brake, only had couple rounds left to do and was pushing to get done before weather moved in. Luckily it was all flat running to get back to the shed. Bet I won't do that again!
 
I always keep one of those big fire extinguisher that you fill with water and pressurize with air on the combine. I also keep an 18v leaf blower with me and clean of the machine at end of day. I am guessing you will need new pads and other things if it got that hot.been along time since I worked on them. Texas Jim may post a parts breakdown so you know what your looking for.
 
Have been thinking of one of those extinguishers for awhile now, after some of the stories that have been on here over the last couple years. Usually have the truck in the field with me, fields are all pretty small by most accounts, with an extinguisher in it. I Have been on the JD Parts website so have a good idea of what's in there.
 
How much difference is there in the quality of the OEM and A&I parts? There is a $100 difference each disc, price wise. Makes it $400 if I do both brakes. Any opinions?
 
Worked at the combine today (finally dry enough to get it out of the shed). Tested the brakes in the barnyard, seemed good enough just not much pedal left. Then took it out on the road, we have a decent grade to go up/down going and coming from the fields. Could stop and hold it on the grade pretty good (had the 4 row corn head on for all this). Not quite as good as it used to but was acceptable. The only thing we hadn't done to that point was bleed the wheel cylinders. Took the corn head off to get ready for wheat and thought why not bleed the brakes see if we get more pedal so did so but didn't improve anything. The boss (dad) thinks we should see how it goes cutting the wheat(only about 25-30 acres mostly flat fields) then we should have time to do a rebuild if needed before beans and corn in the fall. That is if I can ever get dry enough to get the beans in to start with (only a month or so behind).
 
Intend to. Checked over wheel cylinders good a couple times now and so far so good. Had to rebuild both wheel cylinders in the last two years (one two years ago, other last year).
 
I have been a A&I dealer for well over 25 years I have never had anything I would call junk from them,, I buy more from Hy-Capacity but still sold 15-20 K worth of parts a year from them when I ran the repair shop full time
cnt
 
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