john deere industrial models

I am looking at a mid seventies(?) john deere industrial tractor with the serial number tag missing. I am guessing a 401 c. But I am not sure what differentiates a b from a c etc. Or even a 300 from a 400 series. It runs really well,diesel,low hours, has the reverser, great rubber on the rear and a 3 pt. hitch, but no remote hydraulics. Couple of questions. What other ways of identifying the exact model are there? How hard will it be to plumb hydraulic remotes on this tractor? What is it worth considering its a little rough cosmetically? Thanks
 

300 has 3 cyl & 400 has 4 cyl engines. I'm no familiar enough with industrial tractors to tell you the differences between the earlier & later models. Rear remotes can be added to either old or newer models fairly easily.
 
If it was a "C" series, the 310 would have a four cylinder and not a three. 300 and 300Bs have three cylinder engines.

There are many subtle differences in the Dubuque Industrials. Best way to narrow things down is by the engine block #, fuel injection pump #, and size of the hydraulic pump.

Generally speaking . .

310 has the 164 c.i. engines. Injection pump # JDB331AL2406.

300 has the 135 gas or 152 diesel. Hydraulic pump is 24 GPM. Injection pump #s DBGFC331-13DH, JDB331AL2405, AL2732, MD2797 - along with some C series "round" pumps.

300B has the 152 diesel. Hydraulic pump is 28 GPM.
Injection pump #JDB331AL2405

301A has the 152 diesel. Hydraulic pump is 13 GPM.
Injection pump #JDB331AL2405

302 has the 152 diesel. Hydraulic pump is 13 GPM. Injection pump # JDB331AL2406

310C has the 239 diesel (4 cylinder). Also 3-4th in trans is syncrhonized. Hydrualic pump is 35 GPM.

400 has a 180 gas or 202 diesel and 28 GPM pump.
Injection pump #s DBGFC431-2DH, 25DH, JDB431AL2408, AL2731.

410 has a 219 diesel and 38 GPM pump. Injection pump # JDB431AL2408

401B has a small German 1.38 hydraulic pump. Fuel injection pump # will be JDB431AL2408 or JDB431MD2800 or JDB431AL2410.
 
Ok this is what I got.
Hyd pump # LOPVA104365
RP2023COEO100
Fuel pump# JDB431MD/800
Cast #"s on the block:R72972.
R72973
Is it a 401 b ?? What is g output of the pump?
Thanks Kevin
 

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