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D4 7J stuck main clutch

D4 7J stuck main clutch

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catd69u
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I recently traded for this old D4, which I owned several years ago. The fellow I sold it to let it sit and didn't use it. It's been around 15 years since it last ran. Both engines are loose, and the steering clutches seem to be loose, but the main clutch is stuck. What would be the best way to get it loose? I appreciate any replies.

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Thu, Oct 31, 2019 9:45 PM
bursitis
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when you say the clutch is stuck do you mean the lever is frozen and the clutch is stuck as engaged? or the lever and clutch will disengage but the lining is stuck to the plate?

D46U straight blade,D46U cat angle blade,allis chalmers AD4 grader and Khoering 404 dragline. D4C 40A,D4 2T and scraper.

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Fri, Nov 1, 2019 1:05 AM
ccjersey
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Maximum strain on the transmission clutch is when working in high gear.

If it's just the plate that's stuck, and prying with a bar etc won't free it up, you might be able to push the tractor off in high gear and have it chained securely to the pushing machine so it can act as a load. It takes some doing, to make all the arrangements and plenty of room to run, but I've done it a couple times on other vehicles.
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄
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Fri, Nov 1, 2019 4:31 AM
catd69u
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Reply to bursitis:
when you say the clutch is stuck do you mean the lever is frozen and the clutch is stuck as engaged? or the lever and clutch will disengage but the lining is stuck to the plate?


The lever is froze in the disengaged position and won't move. If I put the transmission in neutral the machine will roll free, but if I put it in any gear it turns the engine when I push it with another dozer. I haven't tried to start it yet, as the fuel tank is off and I can get at the clutch better. I've pried on it with bars and banged on it with a hammer, but something is stuck tight. I have backed the clutch adjustment off a long way, but I haven't tried to push it to see if it will come loose. I may try that again, but I don't want to tear up anything if I can keep from it. Everything else seems to be free.............
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Fri, Nov 1, 2019 6:58 AM
catd69u
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Reply to ccjersey:
Maximum strain on the transmission clutch is when working in high gear.

If it's just the plate that's stuck, and prying with a bar etc won't free it up, you might be able to push the tractor off in high gear and have it chained securely to the pushing machine so it can act as a load. It takes some doing, to make all the arrangements and plenty of room to run, but I've done it a couple times on other vehicles.
[quote="ccjersey"]Maximum strain on the transmission clutch is when working in high gear.

If it's just the plate that's stuck, and prying with a bar etc won't free it up, you might be able to push the tractor off in high gear and have it chained securely to the pushing machine so it can act as a load. It takes some doing, to make all the arrangements and plenty of room to run, but I've done it a couple times on other vehicles.[/quote]

I might try this...........
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Fri, Nov 1, 2019 6:59 AM
neil
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Reply to catd69u:
[quote="ccjersey"]Maximum strain on the transmission clutch is when working in high gear.

If it's just the plate that's stuck, and prying with a bar etc won't free it up, you might be able to push the tractor off in high gear and have it chained securely to the pushing machine so it can act as a load. It takes some doing, to make all the arrangements and plenty of room to run, but I've done it a couple times on other vehicles.[/quote]

I might try this...........
sounds like the throwout is seized , should be an easy fix. Take the top cover off and work from the lever to see what's stuck
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Fri, Nov 1, 2019 9:34 AM
catd69u
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Reply to neil:
sounds like the throwout is seized , should be an easy fix. Take the top cover off and work from the lever to see what's stuck


Do you mean the small cover where the clutch can be adjusted? I have that off, and when I move the lever back and forth, as it will wiggle a little, nothing on the clutch will move.
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Fri, Nov 1, 2019 6:18 PM
drujinin
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Reply to catd69u:


Do you mean the small cover where the clutch can be adjusted? I have that off, and when I move the lever back and forth, as it will wiggle a little, nothing on the clutch will move.
Yes, Neil is saying to get after the clutch lever with loose juice, then the shaft that goes down into the clutch housing, following all the bits and pieces of linkage till you get to the throw out collar. Something in the linkages is holding it from moving. Last option is to open the little inspection plate on the left side where there should be a Zerk fitting in the side of the flywheel. Someone needs to watch for this as you SLOWLY roll the engine over, when you find it, pump a couple of squirts in it to try to lubricate the pilot bearing. (this is all from memory, so I maybe totally wrong)
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Fri, Nov 1, 2019 7:12 PM
ccjersey
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Just to confirm, the clutch lever is stuck forward in the slot in the floor plates but will wiggle slightly?

Sounds like you have a start on getting all that linkage and the release bearing loosened up with some sort of spray, pry bar etc. I would get it working freely so once you get the clutch unstuck, you can adjust it and slip it a little to polish the rust out of it and drive the tractor back to the shop.
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄
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Fri, Nov 1, 2019 7:37 PM
catd69u
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Reply to ccjersey:
Just to confirm, the clutch lever is stuck forward in the slot in the floor plates but will wiggle slightly?

Sounds like you have a start on getting all that linkage and the release bearing loosened up with some sort of spray, pry bar etc. I would get it working freely so once you get the clutch unstuck, you can adjust it and slip it a little to polish the rust out of it and drive the tractor back to the shop.
[quote="ccjersey"]Just to confirm, the clutch lever is stuck forward in the slot in the floor plates but will wiggle slightly?

Sounds like you have a start on getting all that linkage and the release bearing loosened up with some sort of spray, pry bar etc. I would get it working freely so once you get the clutch unstuck, you can adjust it and slip it a little to polish the rust out of it and drive the tractor back to the shop.[/quote]

Yes , the clutch lever is in the forward position, and it will wiggle a little. The linkage seems to be loose all the way down to the clutch, but the brass collar behind the clutch won't move. The whole assembly seems to be stuck. I ran the adjustment back away from the engine a long way, and I thought I might try push it with another dozer and see what happens. I should be able to use the steering clutches to control it. It may be a few days before I have time to try it.
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Sat, Nov 2, 2019 6:50 AM
neil
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Reply to catd69u:
[quote="ccjersey"]Just to confirm, the clutch lever is stuck forward in the slot in the floor plates but will wiggle slightly?

Sounds like you have a start on getting all that linkage and the release bearing loosened up with some sort of spray, pry bar etc. I would get it working freely so once you get the clutch unstuck, you can adjust it and slip it a little to polish the rust out of it and drive the tractor back to the shop.[/quote]

Yes , the clutch lever is in the forward position, and it will wiggle a little. The linkage seems to be loose all the way down to the clutch, but the brass collar behind the clutch won't move. The whole assembly seems to be stuck. I ran the adjustment back away from the engine a long way, and I thought I might try push it with another dozer and see what happens. I should be able to use the steering clutches to control it. It may be a few days before I have time to try it.
Based on that description, it's likely either the collar that slides on the transmission input shaft is seized (the brass collar pushes the spider collar and the latter could be stuck) or the links from the spider collar is stuck, or third option is the clutch plate is swollen and won't permit engagement but I'm leaning more to the first two. Some video of the (lack of movement) would help the diagnosis.
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Sat, Nov 2, 2019 6:32 PM
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