JD 300 parts

[markspark]

Can anyone tell me where i can get fuel injection pump parts for a JD300 backhoe?
Ihave tried my local John Deere dealers, fuel injection shops and even some wreckers.
The part i need is the gear in the fuel rack where the accelerator cable connects.
I am told it is a roosa master pump model number AT2304B
I assume there is other models that use the same parts to source them from

Mark

 

[JDemaris]

It's not an AT2304B - it's an AT23048 - which is a CDC style pump that was discontinued early 80s.

You've got a C model pump and many other Deeres use it. The rack and pinion gear-set fits them all. The Deere part # for the gear kit used to be AT31165 or Roosamaster # 18143. Your pump is one of the following Roosamasters - CBC331-AL, CBC331-6AL, CBC331-16AL, CDC331-3DG, CDC331-4DG, CDC331-6DG.

Many parts for that style pump became obsolete in the early 1980s. Deere sold change-over kits to put the DB or JDB style pump in place of the C pump. I installed many - kit had cost around $900 and came with a brand new JDB injection pump, new injector lines, timing gear, etc. The rack and pinion gears, however, were available for a long time after. I used to carry a bag full of them with me in my toolbox. They were a very common wear item.

Other Deeres that used those little round C pumps are - 350 crawler, 400 wheel tractor, 440 log skidder, 450 crawler, 500 wheel tractor, 540 skidder, 544 wheel loader, AG 820 and 920 wheel tractors, 1020 wheel tractor, 1520 wheel tractor, 2020 wheel tractor, 2510 wheel tractor, 2520 wheel tractor, 3020 wheel tractor, 4020 wheel tractor, etc.

 

[JDemaris]

I forgot to mention that sometimes - just the pinion gear goes bad and the rack is still useable. Often, you can just turn the pinion upside down and reuse it by catching unworn teeth - if it wasn't done previously.

 

[markspark]

Thanks for the info tractor guru.
At least i know what i am looking for now.

 

[markspark]

Are you sure the part number is AT31165?
Part number diagrams i found on the JD website seem to indicate AT30118 for the throttle kit or
R45054 for the gear and T31122 for the rack
Can anyone confirm which part numbers i am after?

Mark

 

[Jericl]

I may be in the same boat with you as I have a JD 1520 with the old Roosa Master model C pump.
I found this website which claims to have one reman.
Spencer Diesel

 

[markspark]

I have finally solved the problem.
After speaking to many people and sending countless emails i spoke to a guy in a pump repair shop that was familliar enough with these pumps to ask if the gear tip was straight or curved. When i replied that it was straight he said that it had already been converted from the CDC rack to the CBC style and he had a secondhand set that he sent me that have me going again. The part numbers he quoted were ; gear 18251 , rod 18296, and are, he believes, still available.
So the part numbers i have been chasing for so long were not the ones i wanted and as i was told many times, have not been available since the 80s. I believe this is a very simple conversion to perform and does not cost anywhere near the $2000 to $4000 that i had been quoted for the JDB style pump conversion.

Mark