1971 Caterpillar 120 Grader

garp

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black hawk sd
Recently purchased in less than operating condition. Has a military specific serial number different prefix versus civilian model. Being i work for Caterpillar I have access to most anything information wise. We have a guide that converts military to civilian in most cases it is correct. The machine serial number is 90R00137, guide states a 13U civilian is equivalent, close but needing help. No M designation on the US Army data plate. No luck in searching for publications online. Anyone have a book stashed or the number for the publication?
 

m1010plowboy

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Recently purchased in less than operating condition. Has a military specific serial number different prefix versus civilian model. Being i work for Caterpillar I have access to most anything information wise. We have a guide that converts military to civilian in most cases it is correct. The machine serial number is 90R00137, guide states a 13U civilian is equivalent, close but needing help. No M designation on the US Army data plate. No luck in searching for publications online. Anyone have a book stashed or the number for the publication?

I gotta see this thing. Back around 86' the old boss asked if I'd take a grader on a 30 mile road trip to a job-site. The memory is vague but it had a pup motor that we'd start first. Once the pup was running you'd pull up a lever and the pup motor would engage the Cat motor. I took that road trip and was grading with it that day. Every function had a lever and they'd kick back and rattle your hand if you were doing something wrong. Great days.

I wish I had an operators manual but everything's long gone. I did a quick images search and there's a bit of info out there. https://www.google.com/search?q=13U...URsZ4KHad7B8cQ_AUoAXoECAsQAw&biw=1667&bih=929

There's more than one way to skin a Cat.....manual.
 

garp

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128
5
18
Location
black hawk sd
Construction equipment did not necessarily get a "M" number. From the machine's main data plate, what is the National Stock Number (NSN) or Federal Stock Number (FSN)? Googling this number might help you.
numbers are awful hard to read, been painted over and scratched off, more than once i bet.
 

garp

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128
5
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Location
black hawk sd
numbers are awful hard to read, been painted over and scratched off, more than once i bet.
Main issue at the moment is the thermostat. original is gone, have ordered and tried the three numbers i can find, no dice. housing in the parts book looks the same but regulator wont fit. And the housing has no part number to reference it to. And i have some brackets that are loose, no clue as of yet to their purpose or location.
 

frank8003

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this one got sold.
Maybe they know where to get information you seek.


The National Guard uses them
 
Last edited:

garp

Member
128
5
18
Location
black hawk sd
OK here you go:
Your manual is TM5-3805-249-12 (find online)
Your machine NSN is 3805-00-466-0084
Your thermostat is P/N VD10333 / NSN 6685-00-893-8332, which crosses to Cat P/N 3M6008 and Mil Standard MS35770-3
that TM is for a 130G, mines a bit older. but do appreciate the efforts.
 

fasttruck

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Mesa, AZ
I used to have a model 12 grader with a 318 Cat 6 cylinder motor. Built for Corps of Engineers in 1957 and had a 24 volt electric system and a pony motor starter that was new enough to have the clutch levers in the cab rather on the side of the engine. Think machine had spent time in Ft. Devens MA and came with a cable operated wing plow on the right side. The scarfer had been removed and the lever for the scarfer ran the wing plow.
 

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fasttruck

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I had a Caterpillar commercial parts book and was able to get parts for the machine based on the numbers and info in that book. I suspect the Army, as is suggested in post 2 the military was using vendor supplied books for engineer equipment and did not field their own pubs until later. The only thing on my machine that was hydraulic was the steering. All other functions were mechanical. 2 stick transmission, the works.
 

garp

Member
128
5
18
Location
black hawk sd
I used to have a model 12 grader with a 318 Cat 6 cylinder motor. Built for Corps of Engineers in 1957 and had a 24 volt electric system and a pony motor starter that was new enough to have the clutch levers in the cab rather on the side of the engine. Think machine had spent time in Ft. Devens MA and came with a cable operated wing plow on the right side. The scarfer had been removed and the lever for the scarfer ran the wing plow.
We still get calls to work on these yet. Plenty still earning their keep in ranch country.
 

fasttruck

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The key to survival with a #12 is lotsa grease. There are something like 45 grease points in front of the windshield alone. Neglect then at your own peril.
 
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