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John Deere Tractors Discussion Forum

730D Transmission Repair

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Kamal Shouman

05-09-2006 11:07:35

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I have a 730D. I have removed the clutch and first reduction gear cover. The bearings on the transmission drive shaft and PTO drive shaft are very loose, so I removed the flywheel to get ready to start disassembly of the transmission. I have an I&T shop manual and it doesn't seem to be too difficult, but I thought I would post here and ask if any of you guys have any words of advice before I start. Are there any special tools required? Dose the hydraulic fluid need to be drained before the timing cover is removed?Is there anything that is really difficult to get apart or back together? Any areas to pay special attention to? Also I don�t see any reference to a reverse shaft in the manual I have, and I would think one is required. Anyway any advice will be appreciated.

Thanks,
Kamal

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2cylinderlp

05-09-2006 20:23:08

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Re: 730D Transmission Repair in reply to Kamal Shouman, 05-09-2006 11:07:35

I don't think you have to drain the hydraulic fluid, although it would be good to take the whole rear assembly off and replace the seals that keep the tranny fluid out of the pto clutches. In that case of course you would have to drain at least some of the hydraulic fluid. I haven't put mine all back together yet and I don't remember if those hydraulic lines get in the way or not. I don't think they do. It should be self evident though. I wasn't sure what you meant by a timing cover. There is the top cover. Also the left side cover which hides 4th and 6th gear. That's the area where I had all my fun. The right side reduction gear cover you already have off. There isn't a special shaft for reverse. The 2nd/5th gear just slides the other way to engage the differential directly and that gives reverse. That gear must be that one that gets replaced most often. It gets hit from both sides. They are available new. You will want to set the clearance on the lower right bearing using shims and gaskets. Your manual will cover that.

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2cylinderlp

05-09-2006 19:46:03

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Re: 730D Transmission Repair in reply to Kamal Shouman, 05-09-2006 11:07:35

I have listed a link to a discussion I had with others concerning trouble I had getting my 730 transmission apart. The nut that holds the lower shaft in there was on very tight. It takes a spanner type wrench/tool to really get a hold of it. I couldn't find a tool that I could buy which would fit so I made one. I put a 24 inch pipe wrench on that tool. Then I extended that pipe wrench another foot with a short piece of pipe. Then I stood on the pipe wrench to get that nut loose. Actually I jumped on it. 600+ foot pounds I am sure. I haven't worked on that many of these, but this was the hardest. Others I have been able to loosen with just a hammer, chisel, and/or large channel lock pliers. This one on the 730 is recessed in more and a little harder to get at. Hopefully yours will be easier.

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2cylinderlp

05-09-2006 19:49:20

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Re: 730D Transmission Repair in reply to 2cylinderlp, 05-09-2006 19:46:03

Well that link didn't show up in my first post so I'll try it this way:
http://www.ytmag.com/cgi-bin/viewit.cgi?bd=jd&th=197880

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Kamal Shouman

05-10-2006 05:35:19

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Re: 730D Transmission Repair in reply to 2cylinderlp, 05-09-2006 19:49:20

Hey, thanks for the help.

I got the top cover off last night. A few of the gears have a little bit of chipping towards the outside edge of the teeth. I don�t think it would be bad enough to lower the amount of power they could transfer, but don�t know if the chipped teeth will cause any other problems. The overdrive shift fork has been welded on, look like it was to tighten up the space where the shifter goes. When I get it out I can decide if it need further repair or replacement. The transmission seemed to shift fine. Looks like I can remove the PTO drive without splitting off the differential, but may need to do that to replace seals anyway. Will let you know how it is going.

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