Eaton HO72 Axle Shop Manual - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Joe P** · 02-21-2021, 08:08 PM

Good day all! Could someone direct me to a repair manual for the HO72 Axle? I want to replace my leaky pinion seal but cannot undo the large yoke nut. Yes, I did get the rusty cotter pin out completely and yes, I do have the leverage and correct socket, which I ground the OD to fit into the yoke and get full engagement on the nut. Thinking I can undo the flange bolts and pull out the pinion gear together with the pinion bearing but want to be sure there's nothing else like a snap ring or circlip holding it together. Thanks!

**Getter-Done** · 02-21-2021, 08:26 PM

Here is a thread that I hope will help you.
In the link below.

If the answer is not there
I will help you search the forum for another.

H072 or H052 will bring a lot of info to the top.

Hope this helps

Maybe someone else will chime in.

Link: https://67-72chevytrucks.com/vboard/...highlight=ho72

.

**Joe P** · 02-23-2021, 09:04 PM

Yes thank you that link was very helpful. I read through the link you sent and all the Pirate 4x4 postings on the H072 as well. Based on the info I read there, I pulled of the bearing retainer and pinion gear out. I found that the PO had been in there, lots of orange RTV. The flange nut was hacked up with a chisel and the pinion support bearing (the small one) had disintegrated, galling the bearing surface on the pinion gear. I have a very nice spare center section that I will put in for now but unfortunately it's got 5.13 gears, so the 4WD lever will be off limits until I can find another one... Thanks again!

Short 3/4 · 02-27-2021, 12:39 AM

Quote:

Originally Posted by Joe P

Yes thank you that link was very helpful. I read through the link you sent and all the Pirate 4x4 postings on the H072 as well. Based on the info I read there, I pulled of the bearing retainer and pinion gear out. I found that the PO had been in there, lots of orange RTV. The flange nut was hacked up with a chisel and the pinion support bearing (the small one) had disintegrated, galling the bearing surface on the pinion gear. I have a very nice spare center section that I will put in for now but unfortunately it's got 5.13 gears, so the 4WD lever will be off limits until I can find another one... Thanks again!

I'm on the other end of the country, but just took a few HO's apart, so may be able to help with some parts if you can't find any locally
Tom

**Joe P** · 02-27-2021, 01:56 PM

Thank you for your note. I will PM you separately with parts requests. I will probably need a few things. Stay safe!

02-21-2021, 08:08 PM	#1
Joe P Active Member Join Date: May 2019 Location: OXFORD, CT Posts: 120	Eaton HO72 Axle Shop Manual Good day all! Could someone direct me to a repair manual for the HO72 Axle? I want to replace my leaky pinion seal but cannot undo the large yoke nut. Yes, I did get the rusty cotter pin out completely and yes, I do have the leverage and correct socket, which I ground the OD to fit into the yoke and get full engagement on the nut. Thinking I can undo the flange bolts and pull out the pinion gear together with the pinion bearing but want to be sure there's nothing else like a snap ring or circlip holding it together. Thanks!

02-21-2021, 08:26 PM	#2
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 7,726	Re: Eaton HO72 Axle Shop Manual Here is a thread that I hope will help you. In the link below. If the answer is not there I will help you search the forum for another. H072 or H052 will bring a lot of info to the top. Hope this helps Maybe someone else will chime in. Link: https://67-72chevytrucks.com/vboard/...highlight=ho72 . __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

02-23-2021, 09:04 PM	#3
Joe P Active Member Join Date: May 2019 Location: OXFORD, CT Posts: 120	Re: Eaton HO72 Axle Shop Manual Yes thank you that link was very helpful. I read through the link you sent and all the Pirate 4x4 postings on the H072 as well. Based on the info I read there, I pulled of the bearing retainer and pinion gear out. I found that the PO had been in there, lots of orange RTV. The flange nut was hacked up with a chisel and the pinion support bearing (the small one) had disintegrated, galling the bearing surface on the pinion gear. I have a very nice spare center section that I will put in for now but unfortunately it's got 5.13 gears, so the 4WD lever will be off limits until I can find another one... Thanks again!

02-27-2021, 01:56 PM	#5
Joe P Active Member Join Date: May 2019 Location: OXFORD, CT Posts: 120	Re: Eaton HO72 Axle Shop Manual Thank you for your note. I will PM you separately with parts requests. I will probably need a few things. Stay safe!



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