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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Update--AC Crawler help identify

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Kevin (FL)

02-14-2006 11:58:12

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I posted a couple photos awhile back of what looked like an AC or Cletrac crawler. I was able to get some close-up photos over this past weekend and learned that the machine is an HD7 with the 3-71 GM engine. Still planning to meet with the owner about what he plans to do with the machine. It seems that the engine will start up but then shuts down right away. Possibly a restriction in the fuel system?? Anyone have one of these that actually works? Are they a good machine to have as far as function? Any bad areas besides that it's an old design?

Above photo is the left side nameplate and I posted a front view (blade) photo as well on the help-ID page...

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Kevin (FL)

02-18-2006 06:05:45

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Re: Update--AC Crawler help identify in reply to Kevin (FL) , 02-14-2006 11:58:12

Good to here back from you. Maybe one day we may drop in on you while on a road trip. We have a friend that lives in Wayne County PA and have been up to his place several times. We've been into NY state on the western side and then up north of Binghampton (SP??)--seemed to be plenty of dairy farms in that area. I think it was Owego??

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Lee Bradley

02-16-2006 09:56:38

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Re: Update--AC Crawler help identify in reply to Kevin (FL) , 02-14-2006 11:58:12

I have a 1945 HD-7 with the mil-spec plate so it was probably on a canceled contract when the war ended; repainted and sold. As has been said, GM/Detroits are good running engines and easy to get parts for. AC built about 10,000 HD-7s between 1940 and 1950. These are not as easy to work on as the next generation ACs. The engine has to come out to replace the master/main clutch, the steering clutches are a lot work to get out but I like the sound of the Detroit and it is a good operating machine if you don't mind no power controls. Mine has a 10 foot wide Holt 6-way blade; hydrualic up and down with manual tilt and angle. A very nice antique crawler all things considered. Too bad so many of them are being scraped; collecters could use the parts.

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Kevin (FL)

02-18-2006 06:08:52

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Re: Update--AC Crawler help identify in reply to Lee Bradley, 02-16-2006 09:56:38

Lee,

From what I've been told about this particular machine--everything works but the engine won't stay running. I'm hoping it's just a clogged filter or air in the system. Could be the fuel rack is sticking too??

Thanks for the reply.

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Lee Bradley

02-21-2006 12:25:45

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Re: Update--AC Crawler help identify in reply to Kevin (FL), 02-18-2006 06:08:52

I would be suprised if it was a sticking fuel rack. Check the filters, they could be plugged and will pass enough fuel to start it but not keep it running. Also check that the shut-down butterfly is not closed. It is in the air inlet just above the blower.

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jdemaris

02-15-2006 06:03:35

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Re: Update--AC Crawler help identify in reply to Kevin (FL) , 02-14-2006 11:58:12

My neighbor just scrapped three HD7s and two of them ran. He had offered to sell me all three for $1000, but I passed on it. So, he sold them for scrapmetal. I have an HD4, HD5, and an HD6 - but none of the HD7 parts were any use to me. HD7 was a very rugged, well built, and simple machine. Usually if it has a dozer, it's a fixed outside blade. My HD6 has a hydraulic tilt, but they are not very common. The Detroit engine is very easy to work on and/or get parts for. The steering and engine clutches are easy to work on, etc. Personally, I hate the hand clutch - but that's just me. Keep in mind the parts are big and heavy, the steering clutches are probably rusted and stuck, and parts for anything nowadays, new or used, are expensive. It all depends on what you want - but yes they are well built and rugged machines - and they are also usually beat to sh*t and not taken care of. I kind of wish now I had bought the three HD7s. One of them started great at 30 degrees F with no ether and purred like a kitten. Didn't steer, though. Scrapping it was a shame.

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Kevin (FL)

02-15-2006 20:08:56

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Re: Update--AC Crawler help identify in reply to jdemaris, 02-15-2006 06:03:35

Sounds like that would have been a pretty good deal, but if you're like most of us, who has an extra $1000 laying around? Defintely a shame though about the running engines going to the scrap yard. Maybe another one will come up one day. This machine doesn't look to be too bad as far as being abused or anything.

Where are you located?

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jdemaris

02-16-2006 05:19:03

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Re: Update--AC Crawler help identify in reply to Kevin (FL), 02-15-2006 20:08:56

Central New York, near Cooperstown and maybe 50 miles west of the state Capital, Albany. It's all dairy farm country here - maybe better described as ex-dairy farm country. I came here in the mid-70s and it was rare to meet anybody that was NOT involved in farming. Then we got a new Interstate put in, and for some reason, people from the New York City area now consider this area close enough to own property (170 miles). So, just all the farms are gone and the old equipment is disappearing fast. Many of the farms were also small tractor dealerships. My neighbor sold his farm last year and he still had left-over John Deere tractors from when it was his dad's Deere dealership (530, 620,and a 420). When the city people come up and buy an old farm, one of two things usually happens. Either they have a public auction to clean the place up, or . . . they pay to have a scrap metal dealer come in and everything gets destroyed.

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