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HD9 Dozer

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=79191
Printed Date: 29 Jun 2025 at 5:40pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: HD9 Dozer

Posted By: GAD
Subject: HD9 Dozer
Date Posted: 25 Oct 2013 at 7:17pm

Hi Guys! I'm new to the forum and want to start buy saying thanks to everyone for sharing their information. I think it's the only way weekend warriors like myself have any kind of a chance trying to operate these classic machines. I had a International (hope that's not a swear word around hear) TD9 a number of years back and found fellas like yourselves priceless!

More to the point, I am on the verge of bringing home a HD9 dozer that I consider to be in decent condition with the exception of one track chain which has the pins worn through. Can I replace just the pins or do I have to replace the chain (amateur question I know). Either way, are parts available and what do you think it will cost? If just the pins is an option, and I think it is because I seem to recall one fella talking about rotating his 180 degree, how big of a job is changing the pins.

Thanks

Look forward to some great discussions and posting some pictures.

Replies:

Posted By: gemdozer
Date Posted: 26 Oct 2013 at 4:32am

You have to send your chaine set in special shop and they will turned all pines and boushings

Posted By: GAD
Date Posted: 26 Oct 2013 at 11:22am

Thanks gemdozer.

I found some great U Tube videos on chain work that makes the process very clear.

Are new (replacement) pins and bushings available for a 1955 HD9 and what will a set (for 1 track) cost? Any idea what a shop will charge for doing the work on 1 track?

Thanks

Greg

Posted By: Coke-in-MN
Date Posted: 26 Oct 2013 at 11:32am

IF the bushing is worn through - sorry to say the bushing will need replacing - once the pin is exposed - dirt will enter the area and wear will cause failure quickly.

If the rail height is within limits - new pins and bushings can be pressed into old rails - old rails can be built up also to extend their life but it is a long process of welding .

You might be further ahead seeking another set of tracks or least one track.

When track wear the pin and bushing both wear internally and externally. We see the wear on outside of bushing that is caused by sprocket contact but unless we measure the length of the track between say 4 links we do not realize the internal wear . Track can be brought back to use by doing a 180deg turn of the pin and bushing so new area is brought into contact both internally and on outside .

Another area of wear is the end of the bushing also and that is hard to control as track can get like a snake if wear is excessive. Track that is turned will extend the life but after turning the % of life is not as great as first or new track.

-------------
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: GAD
Date Posted: 27 Oct 2013 at 5:15am

Thanks Coke!

What are the rail height limits and track length (4 links) for a 1955 HD9?

Are new pins and bushings available?

Thanks again

Posted By: DMiller
Date Posted: 27 Oct 2013 at 3:12pm

Problem with a HD9 is it uses 7.0 pitch rail, getting really scarce used if at all available. Fit HD7G, 7GB, HD8G, HD9, HD11. I like to not found the rail I now have to install on my 7G.

https://sites.google.com/site/crawlerheaven/wear-limitpinsandbushings

You may be better off as many down under on the 11 series and convert to Cat rail(6.906) and weld on sprockets/support & lower rollers.

Posted By: Ian Beale
Date Posted: 27 Oct 2013 at 3:56pm

Fiat Allis 10 uses 6.926 - 6.932 inch pitch tracks. Track bolts are 5/8 inch (on a metric dozer), so I'm guessing Fiat used an existing track chain. Chains are 38 or 40 links depending on undercarriage. Sprockets use bolt on halves.

Link height is 4.051 - 4.059 inch

Not sure how other dimensions compare with the Allis chains.

Posted By: DMiller
Date Posted: 27 Oct 2013 at 4:53pm

Ian, wasn't that a FL8 that used 170mm? Bushing OD was 10mm smaller too 48 instead of 58 and 7.0 for the FL10's

Posted By: Ian Beale
Date Posted: 27 Oct 2013 at 9:51pm

DMiller

I'm taking this from my 10 and 10B workshop manual for loader and dozer

The metric link pitch is 175.92 - 176.08mm, bush OD is 57.95 - 58.08, link pin is 36.99 - 37.06

If an FL 8 carries on from the 70CI series maybe check against Cat D4 dimensions. I don't think Fiat was too proprietry about chains and recall that a neighbour found that the small ag Fiat ones fitted a BTD 6 but didn't have the IH plate keys.

For initial confusion our dozer is a "Lungo" - in that it has the 6 lower and 2 carrier roller frames of the loader that were an option on the BD10 dozer (vs 5 and 1 as standard). 10B had the long ones as standard. Took a while to find all that in the manual.

Posted By: ac_sd
Date Posted: 28 Oct 2013 at 10:07pm

I've got a decent set of HD-9 tracks on a parts Tractor, located in San Diego area, though!!!