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Oliver 525 
Bronze Level
Joined: 18 May 2014
Location: NW IL
Points: 4
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 Topic: Allis Chalmers D road grader Problems.
Posted: 18 May 2014 at 11:28pm |
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I bought a Allis D road grader last fall and it runs way to fast in first gear. About 12 mph. We took it out today and it ran about 35 MPH in road gear. Is there a High and low in these things? It is useless right now. What do you think is wrong with it? TIA
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Calvin Schmidt
Orange Level
Joined: 11 Sep 2009
Location: Ontario Can.
Points: 4530
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Posted: 19 May 2014 at 5:25am |
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There was an optional low range transmission available that dropped the speed by 40-50% but they are not very common and highly sought after. My freind stores his 'D' Special grader here and it has all the options including the range transmission.
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Nothing is impossible if it is properly financed
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DonBC
Orange Level Access
Joined: 12 Sep 2009
Location: Courtenay, BC,
Points: 941
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Posted: 19 May 2014 at 11:31am |
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I posted some information on your inquiry on the YT site. First gear should run less than 3 mph with the regular transmission. I wonder if the crown and pinion went out and someone swapped in another set with faster gears. I have never had it confirmed but someone mentioned somewhere that they thought the drivetrain was made by Clark(sp?) and someone else said that the crown and pinion parts were common to a truck rear end. I have always wondered if the drivetrain was adapted from another machine such as a loader because of the large adaptor plate for mounting the engine to the bell housing.
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Jack of all trades, master of none
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Ross D.
Silver Level
Joined: 02 Sep 2013
Location: Erin, Ont.
Points: 339
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Posted: 20 May 2014 at 10:29am |
  Good morning. If your D grader has the step down aux. transmission, the gear shift lever is located on the left side of the seat cushion. It moves by either pushing down or pulling strait upwards.( see attached pictures). These pictures are of two different graders here in Ontario. This aux. transmission is "better than sliced bread". To properly use the grader, it is most beneficial to keep your R.P.M.'s up for proper hyd. power while maintaining the proper ground speed. The actual reduction in ground speed is 66% (taken from the A C manual- 'Operating Instructions'). Ross.
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DonBC
Orange Level Access
Joined: 12 Sep 2009
Location: Courtenay, BC,
Points: 941
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Posted: 20 May 2014 at 10:31am |
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Do you have the serial number? It should be on a brass tag mounted on the frame about where you climb onto the machine on the right side. I have a list that correlates serial numbers to year of manufacture. There were some minor ratio changes in certain years but nothing as extreme as you seem to be experiencing.
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Jack of all trades, master of none
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Oliver 525
Bronze Level
Joined: 18 May 2014
Location: NW IL
Points: 4
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Posted: 20 May 2014 at 11:55pm |
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I will get the serial number tomorrow. When we bought it the seller Claimed that it was the first one to roll off of the line. But I highly Doubt it.
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 53736
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Posted: 21 May 2014 at 5:48am |
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does it have serial # 1, stamped upside down?
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Oliver 525
Bronze Level
Joined: 18 May 2014
Location: NW IL
Points: 4
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Posted: 21 May 2014 at 8:43pm |
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D-101 is the serial number
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DonBC
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Joined: 12 Sep 2009
Location: Courtenay, BC,
Points: 941
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Posted: 22 May 2014 at 10:55am |
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The serial numbers started at 1 so that makes it 101 but still in the first year of production, 1949. 480 were shown to be built that year.
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Jack of all trades, master of none
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