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Primos75 
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 Topic: Allis chalmers hd6 main wet clutch
Posted: 08 Aug 2022 at 3:16pm |
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Hello everyone, im new here and I've got a question. A while back I got an old hd6 with a stuck motor as a project. I've got it unstuck and am reassembling everything. I figured while I had the motor out id check and replace the main engine clutch plates and friction discs if needed. The metal discs checked out good but the friction disc's were wore. I ordered new ones from General Gear in Idaho. I got them the other day and measured them. Now my manual says new should be .245 to .257 I think(not in front of me) and to replace at .217. The ones I got new are between .204 and .209 so I called them and they said they have selling them like that for 15 years and I'm the first person that ever asked that question. Question is did allis chalmers make some revision or change the specs that my manual doesn't show or am I missing something else? Thanks in advance for any help.
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200Tom1
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Posted: 08 Aug 2022 at 11:39pm |
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They did put 2 different clutches in the 6's. Dry clutches on the first ones. Wet clutches on the last ones. Dang, it's been 10 years since I had 1 apart. Even longer on an early model. Yours must be an earlier unit. If they said it will work, they are probably right. Did they send you an extra disk. I've seen them take up the slack by inserting an extra plate.
Edited by 200Tom1 - 08 Aug 2022 at 11:40pm
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gemdozer
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Posted: 09 Aug 2022 at 1:08pm |
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I am still have 4 used friction discs and just check and they are round .253 to .255
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Primos75
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Posted: 09 Aug 2022 at 1:44pm |
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The engine in mine is a 6000 series. Dont know if they used an older clutch on the newer motor when the put it in or not. It is definitely a wet clutch. Its almost a 3/16th diffrence. How would i go about taking that much up? I dont know if there's that much adjustment.
Gemdozer, thats interesting in deed if I can't make this work.
Edited by Primos75 - 09 Aug 2022 at 1:45pm
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CAL(KS)
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Location: Chapman, KS
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Posted: 09 Aug 2022 at 2:15pm |
did general gear specifically sell you wet clutch discs? I havnt seen them advertise replacements except on dry clutch machines, but i wasnt looking either.
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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Primos75
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Posted: 09 Aug 2022 at 2:20pm |
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They do have them listed but it was hard to find. I emailed them to verify they were for a wet clutch. They said they were so here I am..lol
Does anyone have a manual that they can verify the thickness in to compare to what my manual says?
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CAL(KS)
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Posted: 09 Aug 2022 at 2:40pm |
hmm, well since they arnt originals perhaps a guy just needs to go by total clutch pack thickness. its possible the new ones dont need to be as thick with modern material? sorry no real help here, i dont have a good answer for you.
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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AC Mel
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Posted: 09 Aug 2022 at 3:32pm |
Ok....found a oil clutch service manual....let's see if I can get it uploaded
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Primos75
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Posted: 09 Aug 2022 at 3:33pm |
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I wonder if anyone has the part number for these things? If im not mistaken aren't the friction discs the same in the bigger dozers to? Hd 11 and 16's? Just more of them i think..
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AC Mel
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Posted: 09 Aug 2022 at 3:33pm |
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It's big....you might have to scroll left or right to read all of it.
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Primos75
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Posted: 09 Aug 2022 at 3:35pm |
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Thanks for that. My manual has the same thicknesses as yours.
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AC Mel
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Posted: 09 Aug 2022 at 3:43pm |
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Primos75
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Posted: 09 Aug 2022 at 4:37pm |
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Thanks ac mel, thats what I was looking for. I somehow thought if I had the part number I could look it up online and find one..not so easy I found.
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AC Mel
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Posted: 09 Aug 2022 at 5:09pm |
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Also you might need to ad 70 to the beginning of those part numbers...at the end AC was using 8 digits for part numbers....may or may not help. I also checked part numbers for the HD11s to see if they were the same? there not...we have a couple of complete units on the shelf....would probably part with.
Edited by AC Mel - 09 Aug 2022 at 5:10pm
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gemdozer
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Posted: 09 Aug 2022 at 8:05pm |
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The HD6 and HD11 wet cluch disc are the same 645451
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AC Mel
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Posted: 10 Aug 2022 at 9:59am |
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Yes...Hectors right....I see that now...so we probably have some of those parts.
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Primos75
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Posted: 10 Aug 2022 at 11:18am |
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Well thats good to know. So I guess my problem is I dont know if I want to install the ones I have and hopefully have enough adjustment to make it work. Really don't like that idea. Finding ones within the right dimensions seems like alot better idea to me. Rather only do this once. If you guys think you have 4 fiber discs that are within specs im all ears. Thanks
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Ray54
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Posted: 10 Aug 2022 at 12:26pm |
This talk of adding a plate is common for steering clutches  but thought we where having master clutch problems?
Any main clutch that running is oil that I have had out has very, very little ware on the friction surface. The ware that has made them unusable was the drive teeth where ready to be gone.
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Primos75
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Posted: 10 Aug 2022 at 5:20pm |
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Ray54, I agree with you. I got this dozer in nonrunning condition. Pulled motor to get it free and at that time found the oil pump for the main clutch to be broke. I think the previous owner didn't know it wasn't oiling the clutch and kept adjusting the clutch to get it to work..thats were the ware came in.
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gemdozer
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Posted: 10 Aug 2022 at 7:33pm |
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Your new 4 discs are .217 and the minimum is .215 and the 3 used discs plate maybe you gone missing adjustement.
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Primos75
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Posted: 13 Aug 2022 at 5:22pm |
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New discs are suppose to be .245 to .255. Suppose to replace at .217. The ones I got are .204 to .209.
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Ian Beale
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Posted: 14 Aug 2022 at 12:26am |
Mel
I'm just reading this - your spec sheet says it is for a dry clutch
Cancel that as I read further
Edited by Ian Beale - 14 Aug 2022 at 12:29am
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Primos75
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Posted: 14 Aug 2022 at 10:50am |
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Yup, its a wet clutch.
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doctorcorey
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Posted: 06 Sep 2022 at 1:16pm |
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Commenting just to mark the post so I can find it later
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Semper Fi USMC 1958 HD6G, 1959 MF 203 loader, 1960 Case 420B Backhoe, MF 65 Tractor/Loader Diesel
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DieselBumpkin
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Posted: 29 Nov 2022 at 9:33pm |
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Did you have any success on this? I have a 6000 motor that I am going to swap into an early HD6B (S/N 3XXX) with the HD344 motor. I'm trying to figure out what I need to swap over and what I need to replace when I drop in the 6000.
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