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Braswell 
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Joined: 14 Feb 2024
Location: North Carolina
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 Topic: HD7GB loader rear engine seal #
Posted: 20 May 2025 at 8:48am |
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I have the wet bellhousing and I need seals for the crankshaft . There are 2 separate seals … one facing the engine and the other facing the bellhousing. They are identical National # 77286HC I’ve tried a few places to match them up but I need the Original Allis Chalmers part number for them. All I can find is the seal for a dry bellhousing housing.
Reliance sent a seal they say is a double lip but it sure doesn’t look like one . Any help appreciated or where to find the parts manual
Randy
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Codger
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Joined: 23 Dec 2020
Location: Utopia
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Posted: 20 May 2025 at 10:40am |
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What is the serial number of the tractor and engine? Four, or six cylinder?
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Lazyts
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Joined: 05 Feb 2012
Location: Manitoba
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Posted: 20 May 2025 at 12:45pm |
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74029500 seal from Minnpar is about $50. Pretty sure the 670 had same rear seal as 685/11000 series.
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AC Mel
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Joined: 23 Jan 2010
Location: N.Ca.
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Posted: 20 May 2025 at 3:04pm |
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Yes...I concur with Trevor....that part number should be 74029500...available from Minparr. should be applicable to tractor serial numbers 27201-27950 and 34U27951-up. My parts books do not show any configuration of 2 seals....have no idea of what you might have going on there? Yes that seal is the same for both the 3500 and 11000 engines
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
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Posted: 20 May 2025 at 3:55pm |
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Problem with a Gb is they use a IVECO Engine. Totally Different Animal.
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AC Mel
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Posted: 21 May 2025 at 12:03pm |
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Dave...The original 7GBs had the 3500....we have 2 of them. I think any GB with an IVECO...probably was put in for a replacement. The dealers were pushing that conversion big time after Fiat took over. We have a 645 with that conversion from the 3500 AC. Actually a pretty good running engine...but have trouble finding parts
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DMiller
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Posted: 21 May 2025 at 6:17pm |
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All the Gb's that I perused around here had Iveco on them. Back when was having real concerns with the old 7G
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Codger
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Posted: 21 May 2025 at 6:29pm |
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The ones I seen of course that were new were IVECO powered. Older ones I seen had the 3500 engine, or the 344, (I think) four cylinder Allis engine.
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Braswell
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Posted: Yesterday at 5:22pm |
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Codger, thanks for responding… this is the 6 cylinder turbo 3500 engine with a wet converter housing.
The machine serial # is 34U29793
The picture in the service manual shows back to back seals on the crankshaft.
Thanks for the help!!!
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Codger
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Posted: Yesterday at 7:07pm |
I don't have a manual for that exact model but I've checked by another loader, and farm tractor using the 3500 engine and neither show a back to back seal. All show two "O" ring seals, and a lip seal. The lip seal retains crankcase oil in the engine of course, and the two "O" rings seal the flywheel housing to the rear of the cylinder block.
Looks to be a very common setup. Lip seal part number is: 74027280. Larger "O" ring is: 74025097, and smaller "O" ring is: 74020879. You could always pop the seal from the bore and direct measure also. Easy to match it up when the sizes are known.
Hope that is some type of help.
Edited by Codger - Yesterday at 7:47pm
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Braswell
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Posted: 22 hours 1 minutes ago at 9:09pm |
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Thanks for the effort!!!!
This machine has a wet converter housing so the extra seal is to keep the transmission fluid from running into the engine. I have the national seal number and measurements but no one can come up with a match.
Thanks again
Randy
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Codger
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Posted: 20 hours 4 minutes ago at 11:06pm |
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Both applications I cited are powershift with wet torque converter housings. I've never seen more than a single seal in a lot of machines I've been into over the years myself. An uneducated guess is someone installed a second seal as there is a groove cut into the sealing surface of the crankshaft hub. They make "speedi sleeve" to repair this and the seals used with these are special for those sleeves/rings. It would be very difficult to source just the seal without the wear ring as they are a matched set. Many times the sleeves are called "Wedding Bands" also.
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