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Tractor Talk Discussion Forum

john deere 4440 backend

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mark d brown

10-18-2007 06:12:29




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i am just wondering wether any one has had simialar problems to me or not? i have a 4440, had it since new, 12700 hours on it, motor still untouched, original paint & cab liner. (still my pride and joy) but it has a habit of chewing out the 2 short shafts that come out of the differential into the bull gears in the final drives, does a set every 3500/4000 hrs. doesnt seem to be a big problem in other jds over here. have a 4430 with 7600 hrs stll on original shafts but been reraced. a 4450 that done 8200 hrs, no metal in filters or anything and it broke a tooth clean off one shaft, the tooth fell down in the planetry/bull gears, locked the wheel up and split the trumpet housing. the 4450 is on duel 18.4x38s the 44440 and 4430 on single 23.1x34s, the 3 of them pulling the same gear, yet the 4440 chews shafts, am wondering if any over in he us do it? or have been thinking theres something just a bit out in the castings/housing on my particular tractor from new? planetries have been turned 2 time and new ring gears put in once, so its not in the outside housings, theres been no wear on one side of the shafts etc to suggest serous misalignments, it just takes the hard surfacing off and chews the shafts up. any thoughts or suggestions? thanks

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sd pete

10-18-2007 14:04:53




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 Re: john deere 4440 backend in reply to mark d brown, 10-18-2007 06:12:29  
One of my neighbors dropped 10 grand in the rear end of a 4430 a few years ago. Then the next year spent that much again on a 4440. Sure is a pretty green tho.



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mark d brown

10-19-2007 08:27:29




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 Re: john deere 4440 backend in reply to sd pete, 10-18-2007 14:04:53  
i can relate to your neighbour, it cost a bi over $9000 last time around. the shafts about $1260 a side. the preloads should be right i think. (have been on the tighter side when i was doing it) jd dealership did it the 1st time (actually jd come to the party on it by replacing parts) the 2nd time it was done here with help of a jd mechanic from dealership, same again 3rd time and the last time it went back in to the dealership. i will try the jd forum too thanks

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mark d brown

10-18-2007 07:49:08




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 Re: john deere 4440 backend in reply to mark d brown, 10-18-2007 06:12:29  
yes, they have all been pulling the same implenents (although th 4430 has been put to the spray rig now in later years) i have been using castrol as special (used to be called jd trans fluid years ago) since new in 4440/4430 bought the 4450 2nd hand with 815 hrs on the clock, but beleive it has been on castrol oil since new (run castrol crf 30 in the crankcase by the way) same weight set up on 4430/4440 (cast 34"centres steel rims and about a 4" jd weight)the 4450 would be fairly close (havnt weighed them but it has duals, steel outer rims cast centres inside with one weight. all quad boxs done most of their heavy work in c1, occasionally b2 in 4450, planting in c2, odd occasion b3. never been worked at full throttle mostly about 1700/1900 rpm oil changes at 1000hrs or two years filters at 300. engine oil changes 150 hrs filters 300hrs. the 4440 does do more 3pl work (but the 4430 had the same planter on it for 4 seasons before we got the 4440) and the last 6/7 years the tyynes have been removed and converted to zero till so its not as heavy as it was. i cant work it out, it just does it, seems to be the nature of it. its been reraced each time it been pulled down. shows up in the filters every time, drop the oil and take the sensorod seals etc out, drag a magnet across under the crown wheel and you get metal, pull it down and its been the shafts everytime. no one over here can come up with a reason as to why it does it. beatuiful tractor apart from this, i have forced myself to sort of accept it a bit. the only thing i thought odd was when we did the 4450 the cluster gears in the diff were worn too, 4440 has never done it. we were going to just rerace the 4450 just because off the hours, although the drop tests on the axle bearings were still fair. probably just as well we didnt because you would nt have picked the shafts anyway they still had the machine marks across the face of the teeth (even the tooth that came off) so i dont know.

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old art

10-18-2007 20:45:31




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 Re: john deere 4440 backend in reply to mark d brown, 10-18-2007 07:49:08  
are the bearings on the ring gear assy. tight and preloaded to specks.may climb up unper load when warm and under load . when you pull a load the pinion crouds the ring gear over one way and the bearing onthe outherside gets loser .makeing the shaft get out of line , only my .02 cents
my self i like to load them bearings on the high side



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R. John Johnson

10-18-2007 11:42:58




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 Re: john deere 4440 backend in reply to mark d brown, 10-18-2007 07:49:08  
Mark

Try posting over on the John Deere forum. Might get more responses there

John



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Mike M

10-18-2007 06:28:26




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 Re: john deere 4440 backend in reply to mark d brown, 10-18-2007 06:12:29  
Same loads ? same amount of weight added ? all had regular hyd. oil changes with JD Hy-Gard ????



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