• Allis Chalmers manufactured the HD6 tractor for light and http://www.ehow.com/list_7468395_allis-chalmers-hd6-specifications.html# - - industrial farm use between 1955 and 1965 in their Springfield, Illinois, factory. This diesel-powered farm tractor featured several specifications that made it a valuable tool for any farm, and a durable tool that is still in use by some owners today.

Engine

• The engine of a tractor determines to a large extent how quickly it works as well as what kind of ground it can pull through. The HD6 was equipped with an Allis Chalmers vertical I-head engine with 4 cylinders and a displacement of 344 ci or 5.6 liters. This engine required 15 quarts of coolant, ran on diesel fuel, had a 37-gallon fuel tank capacity and needed a 24-volt starter powered by two 24-V batteries. The compression ratio on the regular engine was 15.0:1, but the turbocharged version had a compression ratio of 16.25:1. Both engines were rated at 1,800 rpm, and had a bore and stroke of 4.4375 and 5.5626 inches respectively.

Dimensions

• The Allis Chalmers tractor was built for heavy-duty work on larger farms, and has a height of 66 inches and a length of 127 inches. This tractor weighs approximately 13,400 pounds.

• Serial Number Location

• As with many other tractors, the serial number of the HD6 tractor is located first on the http://www.ehow.com/list_7468395_allis-chalmers-hd6-specifications.html# - - housing or instrument panel, and then repeated on the steering clutch in case the housing panel number is rubbed off or scratched.

Power

• The HD6 claims to support draw-bar power of up to 39 horsepower and belt power of up to 54 horsepower. The power of this tractor may be even greater. When TractorData.com tested the tractor, they found the draw bar to display up to 50 horsepower and the belt up to 60.5 horsepower.

Transmission

• Because the HD6 requires a high degree of maneuverability and may require quick changes based on the terrain, it is equipped with a manual transmission. This transmission has 5 forward speeds and 1 reverse. The HD6 uses a crawler chassis.

Read more: http://www.ehow.com/list_7468395_allis-chalmers-hd6-specifications.html#ixzz1c7m3snVI - Allis Chalmers HD6 Specifications | eHow.com http://www.ehow.com/list_7468395_allis-chalmers-hd6-specifications.html#ixzz1c7m3snVI - http://www.ehow.com/list_7468395_allis-chalmers-hd6-specifications.html#ixzz1c7m3snVI

It was actually made until 1974. with 25271 units being made.

Initially it consisted of the A model 44 inch gauge. B with 60 inch gauge both with 4 roller track frames, later the E came with 60 inch gauge and 5 rollers and the G model the tracked loader version.

The AC badged Buda engine powered all crawlers until 1960 when AC newly developed direct injection 6000 series engines took over at  s/n 13322.

The next major change happened at s/n 14474 in 1961 when the 6E became a more deluxe model with oil master clutch standard and oil immersed steering clutchs and brakes; both being hyhraulically power controlled.

A powershift model the EP was also added at this time.

About this time the A was dropped so the 4 main models were E EP G and B.

The B was also available with 5 roller frame and oil master clutch and  both E and B models had the option of a 4F 2R speed gearbox, this was the standard G box.

The EP had 2F 2R.

All models continued until 1974 with various minor improvements. With approximatly the last 270 models wearing the Fiat Allis badge after there takover of AC on 1 1 1974

Merv

Wish AC was still alive and building the Crawler/Loader lines!  

Merv and Coke where did you get your source of info.  I would like to include it in my AC library.  Thanks much - Orangeman

When Fiat stepped into the picture it evicted the small AC crawlers and replaced them with there own machines such as the FA 7 8 10 14. Most previous owners with HD6s and 11s either kept rebuilding them or abandonded ship to komatsu. FA sales downunder dropped off to zero and the agent eventually dropped the brand and went to john deere.

Is a exellent book about AC by Norm Swinford thats full of alot of crawler and other info.

Alot of my info came from talking to people who had them and looking at alot of books; and parts and service manuels. Alot of contractors had HD6s in my area when i was younger. Haven,t done much work mechanically inside them, but do know my way around crawlers; have been working on and with them for 35 years; mainly with caterpillars tho; but have always had a soft spot for Allis,s as thought they were a well engineered machine.

Have recently got a HD6EP i intend to keep and tidy up.   

Mactractor on here has also done alot of repair work on his collection of 6s and 11s and knows alot of the mods that happened to them.

 When AC/FIAT came in they did away with more dealers dropping the line as the parts supply syatem was consolidated into Chicago area. Minnpar in Mpls did mostly the Industrial line but could get some parts for older AC before Fiat deal.

 The demise of the Industrial left a few strong dealers like Herc-U-Lift still able to get and service many machines but the small independant repair shops and used parts became the source for much OEM and aftermarket parts.

 Now with the Fiat/Allis changing to New Holland the dealer network has changed again in the construction end. It's hard to find much information at a dealer now and like the one in my area they are usless along with the fact they overcharge 20% markup above book standard retail on all their parts. So crooks in business not only kill any brand but leave a bad taste for others who might own the machines before the new dealer took over.

 I have a FD5 also and as far as thet machine it's a good unit and cheaper to run and was a lot less in cost than a D3/ D4 Cat of same size or power. Kind of wish I had bought a FL5 or FL7 machine a few years back to go with the FD5.

Wasn't Carol Stream Fiats last ditch attempt to distribute and sell Fiat Allis here in the US?

Gosh I wish some venture capitalist could bring back the good ole Allis crawlers, dozers and shovels. 

 

If its overfull id say its got water in it. Drop the oil out of it. About 70 litres.

Pull the suction screen for the transmission and steering pumps. Located at LH front of trans; below LH brake pedal. Read back in doctorcoreys posts about his HD7G, hes just been down this road.

Clean or replace the screen; change oil if  need be and flush if necessary.

That is a 1973 machine, the last of the EPs and will have no ground speed governor or push pump, and will have the later transmission pump.

Rippers are a allis TR6, early ones have 2 rams later ones have one.

Winch you want is a Carco E30PS. But these are as rare as rocking horse poo; welldown here anyway.

Cheers Merv

Check the suction screen and hose. Hose may have perished and is sucking air etc.

My 6EP was sitting dead in a paddock too with no drive. Turned out it was full of water, and water had turned oil to cream; pump couldn,t suck it up.

Dropped all oil, flushed it, cleaned screens, filled new oil, changed filters; and away it went, drove it down hill onto truck and home.

Mine is a very early one but Mactractor on here has a late one like yours 88Y24937 and his has alot of improvements and used to go quite well; so yours is the last of them too.

This is just a scavenge pump to return trans oil to rear housing.

My son and I took on a new restore project in the form of an AC HD6B.  #14991 and motor #6-15256.  We have loved digging in learning together.  We have a Pump repair facility where we rebuild vacuum pumps and industrial pumps of all kinds and shapes, so we have lots of machine shop and welding capabilities.  We began by draining everything, lots of water, mucky oil etc.  Pulled the starter as it would not engage, and found the bendix gear chewed up.  Replaced the gear and decided to check the flywheel with a bar for engine mobility.  Ceased.  Pulled the injectors and loaded the cylinders with a good penetrating solution, 50/50 acetone ATF, and let her sit for a few days.  We rocked her slowly for a few days and she finally gave way.  Put the starter back in yesterday and gave here a 24v shot in the fanny and she puked out all the penetrating concoction we shoved down her throat.  We were excited.  We decided to clean the injectors really well before going back in with them.  Here is where my first question comes in.  We got a good spray pattern out of 3 of the injectors.  However, one just wouldn't chooch.  Looking closely at it under a jewelers loop, we saw lots of pitting and decided to replact the injector tip or whole injector if we could not find just the tip.  We are coming up short all the way around.  Does anyone know where or if these old Bosch injectors are available?  Tip# DLLD 150S153 or full Injector #KBLB9681/13.

We are new to the forum and new to Allis Crawlers.  We love restoring things as a Father Son team.  Looking forward to all replies, and we will post pictures if anyone is interested.  Pretty sure this is a wet clutch, as it has a screw on filter by my Left foot and a second dip stick by the oil level.  Thanks in Advance.....