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Allis Chalmers Discussion Forum
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Info on an Allis D grader

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Eric in Oklahoma

08-22-2010 21:16:30




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I have a Model D grader, sn 4391. Can somebody tell me the year? It has the leaning wheels, the full circle blade rotate. Any pics out there of the factory power steering setup, or any working modified ones(with leaning axle)? I think a 60's F-700 had the same style box, and could be modified to work in the place of the other box. I have the scarifier pump still in place, and plan on using it to power the Ford box. I do lean the wheels to steer better, but it is time for an upgrade.

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Eric in Oklahoma

09-14-2010 03:39:56




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 Re: Info on an Allis D grader in reply to Eric in Oklahoma, 08-22-2010 21:16:30  
third party image

Thanks for all the info. No power steering yet, but still gathering any info out there for when the snow flies. Meantime, putting it back to work.
All the rv sites on the right half of the pic were graded with this machine. Nice grader. Got the charging system going again with a 57 Chevy 6400 generator, bolt in. Put in a 58 Chevy wagon voltage regulator I had laying around. +15 amps...

Keep 'em running.

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DonBC

09-13-2010 17:10:39




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 Re: Info on an Allis D grader in reply to Eric in Oklahoma, 08-22-2010 21:16:30  
I have finally taken some pictures of the modifications that I have done to my grader and I will try and post some more. A local machinist friend made the pulley adaptor. He first trued up the mounting face of the pulley then machined a flat flange and drilled three holes for bolting it to the existing holes in the pulley. He then machined the shaft. The left end of the shaft projects about 1/8" into the bore of the pulley to keep it perfectly centred. He cut some threads on the shaft and matching threads on the flange and then machined the shaft to 3/4" to fit the coupling and machined a key way as well. The flange was turned onto the shaft and set with permanent Loc-tite. He also bored a hole through the threads and inserted a pin so that it wouldn't come loose.
My front axle lean still functions.

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Pecos Allis

08-31-2010 20:54:44




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 Re: Info on an Allis D grader in reply to Eric in Oklahoma, 08-22-2010 21:16:30  
I hope this scan of my parts book on the power steering for the model D motor grader comes thru clear. There are a few of these out there on the net just look under Allis chalmer model D motor grader for sale. Good luck on your project. Tried a couple of time but no luck. E-mail me and I will send it to you K.



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DonBC

08-23-2010 17:30:51




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 Re: Info on an Allis D grader in reply to Eric in Oklahoma, 08-22-2010 21:16:30  
third party image

third party image

Your machine looks like mine and looks to be well maintained. The tires look like new and I don't see any obvious repairs to the pipe frame which is not uncommon on these graders. I am going to try and up load a couple of photos of my pump drive set up. I had a flange with a stub shaft machined to bolt on the crankshaft pulley to drive the pump. I put a 4" channel cross member behind the engine cross member to mount the pump. The pump now turns in the opposite direction so I reversed the suction and discharge connections to it. From the parts blowup it appeared as if the pump should be bi-directional and so far it has worked fine. I had trouble keeping the pump drive belts from slipping so that was another reason for moving the pump. My machine is at a job site right now so I will take more pictures when I get it home.
Some people have tried to run pure hydraulic steering through a diverter valve off the main system but I have heard that it was not totally successful.

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Eric in Oklahoma

08-23-2010 18:41:07




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 Re: Info on an Allis D grader in reply to DonBC, 08-23-2010 17:30:51  
Thanks for the pics Don. Any chance of getting another stub shaft made? That is a nice setup. I have a JD combine I could use. I forgot the PS fluid is different, so that would create a problem. Also, I meant to ask, can you still lean your wheels?



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Eric in Oklahoma

08-23-2010 11:43:58




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 Re: Info on an Allis D grader in reply to Eric in Oklahoma, 08-22-2010 21:16:30  
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Another pic.



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Eric in Oklahoma

08-23-2010 11:38:05




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 Re: Info on an Allis D grader in reply to Eric in Oklahoma, 08-22-2010 21:16:30  
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Here is a pic. First attempt. Hope I got it right. It is a D, gas.



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Eric in Oklahoma

08-23-2010 11:32:06




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 Re: Info on an Allis D grader in reply to Eric in Oklahoma, 08-22-2010 21:16:30  
Thanks for the info. I think I confused the main pump as an aux pump. I just got this grader, and assumed the main pump was in the transmission. I see now that the double pulley pump on the left of the engine is the only pump. Any reason I couldnt tap into the pressure line of the abandoned scarifier (before the spool valve) to feed the PS gearbox? Don, any pics of your setup you could post? Front tie rod setup, crank pump setup?

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DonBC

08-23-2010 10:14:05




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 Re: Info on an Allis D grader in reply to Eric in Oklahoma, 08-22-2010 21:16:30  
If it is a Model D and not a DD then I assume it would be a 1955. I have the parts book for serial #'s 5425 and up to the square frame model and no factory power steering is shown as an option. I also don't understand that your machine has a separate hydraulic pump for the scarifier. My book shows that the scarifier is connected to the main hydraulic system. That being said, I have seen a D grader with the fixed from axle that used a Ford power steering box mounted off to one side. That was simple because there is only a single drag link on the fixed front axle. They moved their main pump to drive directly off the end of the crankshaft and mounted a separate belt driven power steering pump. My D grader also has the leaning front axle with two drag links so I joined them together to form a tie rod. I then took a drag link from a sp combine that had a power steering control valve mounted on it to form a new drag link from the steering box to this new tie rod. This same ps system from the combine had a small hydraulic cylinder that I mounted between the front axle and the tie rod. I also moved my main hydraulic pump to direct drive off the end of the crankshaft and mounted a separate belt driven ps pump in the former location of the main pump. I can now turn the steering wheel lock to lock with one finger when the grader is standing still. What a treat!

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DiyDave

08-23-2010 09:11:02




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 Re: Info on an Allis D grader in reply to Eric in Oklahoma, 08-22-2010 21:16:30  
If its gas, it's a'55. Diesel would be 1969.



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