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7000 powershift/pto clutches rebuild

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Hurst View Drop Down
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Joined: 11 Sep 2009
Location: Midway, Ky
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    Posted: 29 Jun 2011 at 5:20pm
My 7000 black belly decided to let loose of 6 gallons of hydraulic oil while I was round baling today out the Powershift plate somewhere (still have to go look when it cools down), and since I was just going to wait until the last field was baled to tear down the powershift and pto, I figured I'll just finish up the last one with the Ford and go on and start working on this tractor.

I read the manual and it says to work on the PTO clutch, you need to remove the torque tube.  I am just wondering what the best way is to go about this?  I plan on resealing all the clutch packs in the tractor and checking the discs for wear that calls for replacing.  I seem to also remember there was something you could do to one of the clutch housings, like machine in another grove or something for a seal.  Is this right or am I thinking of something else?  Additionally, it slowly transfers fluid from the rear end to the transmission/hydraulic/powershift sump, which I believe is the PTO seal from when I removed the 3pt housing a few years ago.

When I took the powershift valve off last year, I pressurized the different clutch packs with air, and 1st and 3rd range packs were both bypassing a lot of air where the 2nd range held nearly all of the air pressure, so I am thinking I have bad seals in there causing rough shifts, rare occurences where the tractor will not engage in 1st range, and the PTO to kick out of gear. 

If anyone has any tips for this job, like how to best work around the cab, how to remove the torque tube without the fancy splitting stands, etc, please post them, because I'm looking for any help I can get on tackling this job.  Also, do you think it would be worthwhile to go on and just tear the entire transmission down to reseal it and replace the reverse idler where it has some teeth pretty badly worn down?  I just want to get it done correctly while I am inside.

Thanks,

Hurst
1979 Allis Chalmers 7000
5800 Hours
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MACK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 2011 at 10:05pm
The PTO clutch is in front of torque tube and PD is in rear of torque tube. I would split ar engine for PTO and put back togather than split at back of torque tube for PD and oil transfer. Much easer than removing torque tube.  MACK
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hurst Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2011 at 11:39am

I was thinking that and then I read the manual for the PTO clutch, and it says double split and remove the torque tube?  It says something about removing a snap ring from the back and then pulling the rest from the front?  I hope there's a way to do the PTO clutch just from the front. 

Hurst
1979 Allis Chalmers 7000
5800 Hours
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2011 at 4:59pm
If it was mine, I doubt if I'd do anything with the PTO clutch unless you are having slipping/engagement issues. I would consider splitting and resealing and rebuilding the Power Shift clutch pack. All new seals on the pistons and be sure to replace both discs and both plates in the "overdrive" clutch pack as they usually cause a slow/slippery kind of upshift when they get some hrs on them. Also, never replace any wave springs in a given clutch pack unless you replace them all,,,,not written in the service book. Clean all flyballs in each clutch pack too. The reverse idler I think maybe could be changed out while you got it split by removing the shift cover and lift arm hsg.  Oil transferring might be the lower PTO seal in the rearend if it is going from the diff area to the hydraulic area and can also be done while split.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hurst Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2011 at 7:18pm
I was thinking of resealing the PTO clutch for a couple reasons.  One is that I can't get input shaft seals to hold on this tractor.  I've put in 3 and all 3 have started to leak pretty soon afterwards.  Would the PTO clutch be able to spray oil on the input shaft or do something else that would cause seals to not hold, or do I just need to replace the needle bearing, seal, and sleeve the shaft (figured I could heat up a speedisleeve and it should expand enough to slide over the shaft).
Secondly, the tractor's PTO will kick out when I shift the powershift when warmed up.  This may be the powershift seals, since I know I have 2 packs that are not sealing with air very well.  If it's not much more work to redo the PTO clutch when I redo the input shaft seal and needle bearing, I would probably go ahead and do it while I have it apart so I know everything is new in it, but if it's a lot more to do that, I may wait.  I guess the best thing to do would be to do the powershift clutch pack, then run it a while with the leaking input shaft seal just to see if that solves the PTO disengagement problem when shift, and if it doesn't, then do the PTO clutch?

Hurst
1979 Allis Chalmers 7000
5800 Hours
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Location: STAYNER,ONTARIO
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WD45 Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2011 at 9:47pm

Good luck with your repairs Hurst.

Fred Dunlop, G,B,CA, WC,WF, 3 WD45`s,gas, diesel and LP,U,D10 series III, D12,D14,D15 SERIES II,D17 Series IV in Gas and Diesel ,D19 GAS and D21,170 185,210 ,220 an I-600 8070 fwd, 716H and 1920H
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hurst Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jul 2011 at 12:23am
Thanks, Fred!  I don't think I'd be able to do 90% of the repairs without the help of the people on this forum!  100 times better than any service manual. 

Hurst
1979 Allis Chalmers 7000
5800 Hours
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