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michale34 
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Location: arkansas
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 Topic: hd7g
Posted: 29 Sep 2011 at 2:38pm |
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im looking at a hd7g . they guy said it has a final drive problems. i was wondering if the same geers were used in the later model 6g.
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gemdozer
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Posted: 29 Sep 2011 at 2:50pm |
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I dismantled some HD7G and the final drive parts are not the same then HD6G
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Coke-in-MN
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Posted: 29 Sep 2011 at 3:06pm |
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HD6 uses the same casting as the HD5 , early HD7 and the HD7 built in the 60's are not the same , to each the parts only go with the machines of their time .
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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."
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michale34
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Posted: 29 Sep 2011 at 4:44pm |
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i know the hd6g i got has the same engine in as a hd7g only difference is the turbo and the shovel part looks the same . i know the 7g is powershift and oil steering clutches but i didnt know if the final was the same thanks for the info
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beindustrial
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Posted: 30 Sep 2011 at 1:58am |
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The engines of HD6G and HD7G looks the same however their gears and features and different. And I doubt if you can use HD6G's engine to replace HD7G.
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Mactractor
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Posted: 30 Sep 2011 at 3:16am |
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The HD7s Coke refers to are crawler tractors of pre WW2 non unit construction design. HD7G is a tracked loader produced along side HD6, HD6G with post war unit constuction design. Most parts ARE interchangeable with HD6/HD6G including engines. HD7Gs 7000 engine is the turbocharged HD6 6000 engine. Final drive parts on HD7G are interchangable with HD6E and HD6EP dozer/tractors from number 14484 up with oil emersed hydraulic steering, except the sprocket shafts which are longer on HD7G. Track Sprockets have pitch to suit HD9/ Dry clutch HD11 chains on HD7G, not HD6 chain. These matches apply to HD7G, not 7G series B. Mac
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Mactractor
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Posted: 30 Sep 2011 at 3:27am |
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I forgot to mention HD7G torque converter and transmission are interchangeable with HD6EP tractor dozer. We are touching on one of the very redeeming aspects of Allis Chalmers crawler engineering - the parts interchangeability. No other maker matched them there. Mac
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michale34
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Posted: 30 Sep 2011 at 8:08am |
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hey mac just one thing interesting i found years ago my transmission went out on my hd6g 'late model' so i got another transmission out of another one 'late model' and the casting was different around the bottom where it bolted into the rear end. that had everyone puzzled even the old allis mechanic that helped me.
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Mactractor
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Posted: 30 Sep 2011 at 1:50pm |
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Could that trans not be bolted in Mike? If not, its the first time I`ve heard of any direct drive HD6 trans being not swapable with those from any other HD6 tractor, dozer, or shovel. The casings on single reverse and two reverse trans are different, but they still interchange. On final drives again, the last HD6Bs (number 22251 up) also have the same gears as HD7G. Mac
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Coke-in-MN
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Posted: 30 Sep 2011 at 2:46pm |
Was not sure on the real late HD6 units as they differ greatly from early units. Almost two completely different machines as the progressed.
Reach height of loader and the geometry changes stand out but the ones covered internally are the other ones I am not familiar with .
But like my HD5G some changes do not show up until you look close from early machines to later ones, be it pin lemgth on loader points, to the cross support in the loader frame.
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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."
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HD6 Merv
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Posted: 30 Sep 2011 at 5:27pm |
Just adding abit more, All very late letter s/n HD6s; ie 37A HD6G etc use tha same 46 tooth bull gears as the wet s/clutch HD7G and HD6EPs.
Merv
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Mactractor
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Posted: 01 Oct 2011 at 12:11am |
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As you can see Mike, it wont be difficult to get final drive gear sets. Damn good machine. I`d like to get hold of one. Mac
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michale34
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Posted: 03 Oct 2011 at 12:26pm |
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this hd 7g was bought new in 67 because the owner and my dad bought the machines at the same time new. my dad bought a 6g and the othe guy a 7g. the guy said he bought a 7g because of the ps transmission and he has only 1 arm. he said that he used it about 2 years ago digging dirt and the right side final started making a clicking sound and stopped pulling on that side . also he said it had some turbo problems making it smoke like a smokestack.
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Mactractor
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Posted: 03 Oct 2011 at 2:54pm |
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Like all unit construction AC tractors Mike, final drives are relatively easy to rebuild. Turbochargers are still common today (TO4). In a post on this section the other day, member `Dozer` mentioned he wants to sell his 7G
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michale34
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Posted: 04 Oct 2011 at 2:02pm |
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hey mac that transmission i talked about earlier on that 6g would not bolt on. the old ac mechanic couldnt beleave it either an he took both the new transmission and put it in the old case .I remember he said that my 6g was getting to the last in production and they made have made a few changes. i know its not the same rear end in it now that was in it then because my dad changed it out before he died because the right steering clutch keep going out and no one knew why.
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michale34
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Posted: 04 Oct 2011 at 2:03pm |
and the engine came out of a dozer because the original threw a rod.
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Mactractor
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Posted: 04 Oct 2011 at 3:06pm |
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If that back end has 37A serial number (22251 & up), the finals should have 46 tooth bullgears and go in the 7G. I gotta check up on those direct drive trans Mike. Maybe all those post number 22251 tractors are like that.
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michale34
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Posted: 04 Oct 2011 at 3:15pm |
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ill try to get ahold of mr jones he had a book with all of the original serial numbers in it . dad scraped that rear end that came out of it.
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HD6 Merv
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Posted: 05 Oct 2011 at 12:45am |
possibly the later 22251 series changed to the wet clutch bevel gear and pinion at the same time they changed everything to the common 46 tooth bullgears.
I know that the earlier dry steering clutch crawlers had a different bevel gear and pinion to the wet s/clutch crawlers
Someone with a very late parts book would need to check this
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HD6 Merv
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Posted: 05 Oct 2011 at 1:52am |
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Thinking about this abit more; these late rear housings were the same on all the series of tractors so there is a good probability bevel gear sets were changed to the commom configuration; but best to check in a late parts book for the 37A 40M 70C series tractors.
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