Injector Pump, rebuild old or buy conversion kit?

Hey all it has been a while since I have posted here but good to catch up reading your posts!
Anyways, my cbc injector pump on my 1970 3020 diesel is leaking and needing a rebuild. Serveral months prior I had to replace the electric fuel shutoff. Deere no longer carried the replacement or cbc style pump. They want you to convert to the other style pump, fittings, injectors etc. I found a replacement solenoid from Shiver Diesel in Tifton, GA and they also perform rebuilds. So begs the question? Rebuild or convert to the new? Rebuilds are getting close to the costs of buying new with regard to labor and parts. Have any of you bought this new conversion kit? Your thoughts would be greatly appreciated.
lee

I would run it till it quits. Put new shut off on and run it.I have a JD 300 that still has cbc pump on it I will not have it rebuilt however I will run it as long as it will.

The CBC was a good little pump. Much better than the CDC it replaced. But. . . all parts support for the pump was discontinued by Stanadyne/Roosamaster in the early 1980s. Many pumps had to be scrapped once the rack and pinion gears in the goose-neck thottle wore out. This left Deere Co. kind of stuck - so they came out with a changeover kit - so an owner can retro-fit a D series pump onto the engine.

If your pump still works fine, still has good rack-and-pinion throttle gears, etc. - then fixing a leak is a good idea. Even though the seals are no longer available by part number, most can be matched up to something.

But - a note about "rebuilt" pumps in general, and also about shops that say they still "rebuild" CB pumps. Injection pumps are rarely actually rebuilt - going by the defintion of the word. Most major parts are reused - as is - not renewed, not replaced. Pumps are basically resealed, patched up, and calibration checked and set as needed. I've heard of several shops advertising lately - that they "rebuild" CBC pumps. I called several and asked where they were getting their parts. Every shop I called had NO new parts. They were just patching up pumps with old, used parts taken from other pumps. So, unless I hear otherwise, I will assume that the diesel shop you mentioned also cannot get any new parts.

What Deere has done with the kits is this. The original CBC pump on your tractor uses a different timing gear in front of the engine - then the JDB or DB pump does. To save the expense of tearing the engine apart and installing a new timing gear for a pump change-over, Deere made new "conversion" pump driveshafts. This way, you can stick a DB or JDB pump onto your engine, as-is, and mate it to the CBC style timing gear.
Nobody makes these shafts aftermarket - Deere is the only source. And, once they stop selling them, you're out of luck.

If it was my 3020, I'd reseal the pump - myself. And, buy one of those conversion shafts to have on-hand before they become unavailable. If you can't - or don't want to reseal the pump yourself- It's questionable to me - if it's worth spending much money on - having a shop do it. Much depends on the price. If you were to spend -let's say - $400 to get your obsolete pump patched up - not truely rebuilt - where does that leave you a year later if it craps out?
On the other hand, if you could buy an OEM Deere conversion shaft for less than $100, and find a used DB or JDB pump for $100, or $200, you'd have a better set-up in my opinion. Deere - in their conversion kits - sell a "rebuilt" pump with a conversion shaft already installed, along with new injector lines and a special bracket so you can bolt the pump onto the different CBC mounting studs.
I worked in two diesel pump shops - both under the roofs of Deere tractor dealerships. Most DB or JDB pumps - if they still turn - can be "rebuilt" for less than $50 in parts. For that reason, used pumps are usually good deals when bought cheap. I've bought many for $75 and less, but you have to keep your eyes open.
Also, if your CBC pump went bad, and you did NOT have the Deere conversion shaft - the only other option for a changeover would require - a new timing gear, pump, driveshaft, and all new injector lines, a special bracket to hold the DB/JDB pump to the different CBC mounting studs, and mods to the throttle linkage.

Thank you for the information! I called my local deere parts and they said the kit is no longer available. He also stated a new pump SE500548 at $2k or reman at $1k. I asked if I would have to change out the injectors and lines and he says they should match up. My pump is CBC481-7AL Do you know what jdb pump I should get?

I don't think your dealer knows what he/she is talking about. All the major changeover parts are still available from Deere. Also, no way will the injector lines work (CBC lines on a DB or JDB).

SE50048 is a rebuilt pump and not the one you want. The changeover pump from Deere comes with a driveshaft installed - which you need. The CBC shaft wont' work.

Pump and shaft from Deere is AR69412. List price is $1601.40 outright or $200 off with a good core. Your core won't do, they only will accept a good JDB or DB core.

Besides the AR69412 pump and shaft, you need an adapter clamp to bolt the pump to your engine. Deere # for the clamp is AR69420 and Deere list price is $49.49.

Also, besides the pump and clamp, you need four new injector lines. There is no way the lines for the CBC pump will be made to fit the JDB.

I stated something earlier about a special adapter shaft for the changeover pump. Actually, a special shaft is only needed for engines in 1020s, 2020s, 2520s, etc. That because on them the injection pump drives off a front timing gear. On 3020s and 4020s - the injection pump drives off the camshaft and engine oil pump. So, the driveshaft if the standard shaft used on any 3020 that comes with the DB or JDB pump.