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AC crawler

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Mike Wurth

06-17-2001 20:06:56




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I'm getting an old AC crawler and not sure what I,ve got. It's a 3 cyl diesel with the GM 2 stroke engine. Hyd. blade control, manual trans. I,m guessing mid 50's? Where can I find the data plate to get serial numbers and ID? Also want to put some Marvels Mysery oil in the top end before starting it,,,how do I do that? No injectors like a regular diesel! Thanks for your help,,,,MIke




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UPDATE,,,

06-20-2001 18:27:52




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 Re: AC crawler in reply to Mike Wurth, 06-17-2001 20:06:56  
I found the data tag it's a HD9B-1352. I'm so jazzed I can't wait to get it home and work on it. How do I find out what the blade is? It looks like the modern day C-frame with the two hyd cyl's on the nose, manual tilt and angle. It also has a Carco winch on the rear. First thing I need is a new final drive sproket. The # on it is 69029,,,any ideals on where to start looking? You guys are great for helping so quickly and with obvious knowledge,,,I hope you can put up with the newbie questions from me,,,I will be here for quite awhile I think :^)

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Zeus

06-30-2001 00:29:04




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 Re: Re: AC crawler in reply to UPDATE,,,, 06-20-2001 18:27:52  

Mike, for parts you might want to try All Parts at [email protected]



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Lee Bradley

06-21-2001 09:46:06




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 Re: Re: AC crawler in reply to UPDATE,,,, 06-20-2001 18:27:52  
Are you sure this machine has a 3-71? All the HD-9s had 4-71s. How is the blade tilted and angled? That will give a clue as to the manufacturer. The HD-9 replaced the HD-10 in 1950 and were built until the mid-50s when it was replaced by the Buda/AC engined HD-11.



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Mike Wurth

06-22-2001 21:20:42




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 Re: Re: Re: AC crawler in reply to Lee Bradley, 06-21-2001 09:46:06  
Lee I was going off a visual af the air box covers an the left side,,,assuming that is was a 3 cyd, as there where three covers. I will look closer and count the exhaust ports. The blade is angled by removing pins in the c-frame and moveing to another hole left or right, I need to look at how the tilt works before embarrasing myself more. The blad does have some interesting pockets on the rear of the blade I was told they where for rippers or a brush rake like attachment.

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Lee Bradley

06-24-2001 08:30:07




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 Re: Re: Re: Re: AC crawler in reply to Mike Wurth, 06-22-2001 21:20:42  
Mike,
Are the pins through the c-frame vertical or horizontal? My Holt has vertical pins that go through a saddle that slides foward or backward on the c-frame to angle the blade. The side frames from the blade are pined to the outside of the saddle on fingers so they can be pined on different fingers up and down to tilt the blade. The blade is attached to the c-frame to support angle and tilt.

Lee

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Mike Wurth

06-24-2001 20:35:17




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 Re: Re: Re: Re: Re: AC crawler in reply to Lee Bradley, 06-24-2001 08:30:07  
Lee the pins do run verticaly and the frame of the blade sorta wraps around the c-frame with the pin running thru the both of them. I hav'nt been back to check how the tilt works but do remember a series of holes and two plates at the rear of the c-frame that may be lined up in different positions for tilt, sound about right? What the make on your blade? Thanks for all your time and effort,,,it's really helping me out,,,,,Mike

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Lee Bradley

06-20-2001 09:32:52




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 Re: AC crawler in reply to Mike Wurth, 06-17-2001 20:06:56  
Mike,
You have a HD-7, they were built from 1940 to 1950. The Detroit/GMC diesel has the injectors under the valve cover and is operated by a push-rod from the cam. These engines only have a low pressure fuel pump (about 40 psi) that supplies fuel to the injector. The injector combines the function of high pressure pump and injector. I would replace both fuel filters. One is under the seat and one is one the engine. Open both fuel tank drains and run fuel into a catch can until you get clear fuel. If the tractor has set very long it probably would not hurt to drain all the fuel and start with new. Also make sure your fuel level in the tank is above the engine fuel filter so it will fill both filters after you change them. After you change the fuel filters open the bleed hole (remove plug) on top of the engine mounted fuel filter and let the fuel run until there is no bubbles in the fuel. NEVER let a Detroit run out of fuel, they are a bear to bleed. Also you will probably find that the engine does not have a full flow oil filter, just a strainer that you clean and a by-pass filter on the exhaust side of the engine. Do you know what blade your machine has? AC did not build their own blades and blades came from a number of vendors. My HD-7W was built in 1945 and has a six-way Holt blade, only up and down is hydraulic.

Good Luck and have fun,
Lee

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Farm-Al....

06-20-2001 19:09:14




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 Re: Re: AC crawler in reply to Lee Bradley, 06-20-2001 09:32:52  
Good evening Gentleman,Just read Lee's post on the GM Diesel engine and would like to clear up a few points that were made. The fuel pressure at the inlet side of the cylinder head should be a minimum 65lb's,this is true on all two cycle Detroit engines, to bleed the air out of a two cycle you simple hook up an outside source of fuel to the inlet side of the seconday fuel filter and pump fuel through the fuel passages in the head and through the injectors, you can even run the engine on this source of fuel but be sure to direct the fuel flow out of the fuel pump into a bucket, to rig up a pump for this an electric fuel pump will work, I have even used a pump up garden sprayer.If this engine has set for some time it would be a good idea to pump fuel through the injectors, remove the valve cover and work the rack back and forth to be sure the injectors are free and not stuck or sticky which can cause an overspeed condition,flushing the old fuel out and changing the filters is a must,Filling the new filters with clean fuel before installing can help the engine to prime, good luck Al

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Lee Bradley

06-22-2001 09:12:32




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 Re: Re: Re: AC crawler in reply to Farm-Al...., 06-20-2001 19:09:14  
Well I went back and checked my A-C manual and they show 25-65 PSI at high idle. High idle is about 1700 rpm, slightly higher than rated load rpm. More important than fuel pressure is the fuel flow. The fuel system should flow about 30 gallons per hour, most of that going back to the tank. This returned fuel flow is used to cool the injectors. Do not run your Detroit/GM out of fuel they are a bear to bleed and it can damage the injectors.

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Farm-Al.....Fuel Flow on a Detroit

06-23-2001 04:37:00




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 Re: Re: Re: Re: AC crawler in reply to Lee Bradley, 06-22-2001 09:12:32  
Lee, What your book is telling you is true to a point, the return fuel line has a restricted fitting installed some where between the head and fuel tank depending on the application and hence this controls the no load high idle fuel pressure, if this fitting gets plugged it will raise the fuel pressure and cut off the return flow, the transfer pump relief valve opens at between 65 and 70 lbs.,however this pressure will go up a lot higher if the restricted fitting gets plugged and also will roll at idle or just above. The 25lbs they list is a ballpark low idle pressure which can even be down around 10lbs and still run ok at idle.These engines are 1/3 cooled by air, 1/3 by coolant and 1/3 by fuel so a flow problem in any one of these areas can cause overheat in high temp, full load conditions. Bleeding is very simple if you rig up a pump as I mentioned in my outher post.Al

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Farm-Al....HD 7...

06-18-2001 05:20:19




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 Re: AC crawler in reply to Mike Wurth, 06-17-2001 20:06:56  
The S/N of the tractor should be stamped on the rear end of the trans, case on the right side, most of the older GM 3-71's AC used had a plate on the right rear of the block with the S/N and model number. I don't recommend putting any oil on top of the pistons, a GM engine has very little piston to cylinder head clearance and you could bend a conn rod, instead remove the three air box covers on the side opposite the blower and check the piston and ring condition through the liner ports.Al

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Mike Wurth

06-18-2001 20:24:09




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 Re: Re: AC crawler in reply to Farm-Al....HD 7..., 06-18-2001 05:20:19  
Thanks Al,, will look thru the air box covers first,,,I can hardly wait to get this thing runnin,,,,Mike



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