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Allis Chalmers Discussion Forum
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Identify HD14

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Ed McCammon

06-22-2006 11:03:37




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I just picked up a HD14. But don't know the difference between the 14 and 14C.
I only know it's a hd14 from looking through photos until my eyes bled.
They only thing that even says AC on it is the plate for lubrication.
Where is the serial number for this crawler? And how do I tell the difference between the two models?
I need to order service/operators manuals, and want to make sure I get the right ones!

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Ed McCammon

06-23-2006 14:40:41




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 Re: Identify HD14 in reply to Ed McCammon, 06-22-2006 11:03:37  
Ok, I found the parts and operating manuals for this, but I have yet to find the Service manuals for the HD14C.

Anyone have and links to someone who sells this?
Thanks!



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Tramway Guy

06-23-2006 12:17:11




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 Re: Identify HD14 in reply to Ed McCammon, 06-22-2006 11:03:37  
You still have a clutch even with a torque convertor, otherwise you couldn't shift it.
The torque convertor output speed varies with load, as the load increases, the convertor output will slow down, but the pulling torque increases significantly, perhaps 2 or 3 times what it would be otherwise (depending on the torque convertor design). You will probably find it almost impossible to stall the tracks completely in low gear. The engine will bog down but never drop below a certain RPM.
Slippage in convertor will be negligible at no load, maybe 3 to 5%.
I would say you have a very desirable machine. Now as far as the clutch slipping, a typical clutch of that type will probably require about 25-40 lbs force to snap it into engagement. If it is too easy, it is usually simple to adjust.

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CAL (KS)

06-23-2006 05:27:09




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 Re: Identify HD14 in reply to Ed McCammon, 06-22-2006 11:03:37  
The difference is 14C had torque convter drive similiar to your automatic transmission car allowed "stall proof" dozing. Both the 14 and the 14C us the GM 6-71 2-stroke diesel however, the hd 14 has 6 forward and 2 reverse speeds via a high and low range shifter and 3 speed +revers gear box. The HD14C has ONLY 3 forward and 1 reverse so i would expect to see only 1 shift lever.

Serial # is located on right side of shelf that runs out to rear of transmisson case and on right side of front floor plate.

NOTE: TC drive was not made untill 1946 and would have to have a serial # higher than 5454

Serial #'s by year
1939 18-25
1940 26-548
1941 549-1165
1942 1166-2112
1943 2113-3137
1944 3138-4258
1945 4259-5454
1946 5455-5814
1947 5815-6422

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Ed McCammon

06-23-2006 10:13:43




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 Re: Identify HD14 in reply to CAL (KS), 06-23-2006 05:27:09  
Ok, that almost makes it worse!
I have a hand clutch, only ONE gear shifter, but two reverse gears. But I know I don't have six forward gears unless I am really missing something here.
Also, after cleaning up the lubrication chart a little more, I see the first thing listed as 'Torque convertor bearings'.
Maybe this is the wrong data plate?
And do you still have a torque convertor with a main clutch? I opened up the access panels to look at the clutch, and it's all there, throwout moves fine, etc.
The hand clutch seems to move pretty easy, and it slips under power, which leads me to believe the clutch is slipping.
But that data plate saying torque convertor bearings bugs me.

Ok, I will go clean a LOT of built up dirt/grease/crud off of it and look for the serial number.

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Ed McCammon

06-23-2006 13:55:41




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 Re: Identify HD14 in reply to Ed McCammon, 06-23-2006 10:13:43  
Ok, after a couple hours with a pressure washer, I found the serial number.
HD14C 5800
I was totally looking in the wrong place to start with, so I just kept working my way back until I found the serial.

Ok, while playing with the tranny, it almost looks like it has 4 gears, but it's very hard to tell because the shifter is pretty sloppy.
I know while sitting in it, the gear furthest to the right, shifting away from me, will get STUCK in gear sometimes. It is very hard to pull the shifter out of gear. Guess I have to open it up and see if there is something worn or missing.

Now, before I find some manuals for this thing, what are people using for transmission fluids?
I pulled the tranny dipstick and it smells like old gear oil. And it definitely has some water in it (slightly brown color).

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