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John Deere Tractors Discussion Forum
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Help with sprockets on a 48 D

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430WLPG

11-20-2005 12:19:31




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We have a bad drive sprocket and was wondering if you could push the diff. shaft over to one side through the diff. carrier and get the sprocket out? But,We are having trouble getting the bearing race off. Has anyone tried this?




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Glen in TX

11-20-2005 13:05:57




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 Re: Help with sprockets on a 48 D in reply to 430WLPG, 11-20-2005 12:19:31  
Are you talking about the differential slide gear sprocket or the sprocket on axle? For the differential you will have to support it with a chain hoist and remove both bearing quills and if the gear is that bad chances are other parts are worn too and best to just remove the complete differential for a proper rebuilding or switch from another parts tractor. Not sure if enough room to just slide out to side and out top. It's too big to go out quill hole. You'll need the rear axles and sprockets out to have enough room to get differential out. Usually lots more worn parts if one is that bad anyway. Then you can get the leaky rear axles done too. The quills are usually tight and can be carefully pryed and pushed more from the inside and careful to not break off any of the cast flange on outside when prying. More penetrating oil on the inside bearing to get it loose. Fun, fun but it can be done by properly supporting it all and with help of a chain hoist or picker hoist. I&T shop manual JD-4 will guide you through all this. YT and many other vendors have it.

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430WLPG

11-20-2005 16:20:18




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 Re: Help with sprockets on a 48 D in reply to Glen in TX, 11-20-2005 13:05:57  
We have the I&T but all it covers is removing the diff. as you said. What happened was the drive chain broke and knocked off 2 teeth from the side gear sprocket and poked a hole in the bottom of the case,everything else is great ,but we tried to push the diff. shaft over,but it must be a press fit in the carrier ,cause it won't move. It wouldn't be worth fixing ,but it has a rebuilt engine with H&S Lpgas pistons and manifold,it's about 6 of one and a half a dozen of another in fixing the rearend and swapping out a engine crank foward. This tractor was used in western Colo.in tandem and this one was the rear tractor so when the chain broke they didn't know it,other wise I think it would have just stopped and maybe not tore anything up.

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Glen in TX

11-20-2005 19:20:36




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 Re: Help with sprockets on a 48 D in reply to 430WLPG, 11-20-2005 16:20:18  
I believe it describes how to get the axles loose and make room for getting the differential out in the I&T manual in paragraphs 238, 262 & 268. You'll have to block it up good and get the inner axle nut loose, rear wheels off and take out outer axle retainer and bearing off to get axle to slide out of rear sprocket and quills to remove sprockets and axle to have room to move differential to the rear more to get it out. Might as well change the axle inner seals and outer felts while you're at it. Some more service and maintainance is also covered in the JD Dir. 225 Instructions and Operations manual for the 31-38 unstyled Ds. It will also apply somewhat to the styled D as the engine and trans are same. Dir. 225 is available from JD yet. 800-522-7448. Don't usually see that sprocket on differential that worn but can understand why if it did what you are saying. We had a differential in a 28 D that was just plumb worn out and seized up and had to cut the shaft loose with a torch to get it out. These Ds were the big work horse on the farm so some got really abused and ran hard.

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