Hey Pump Guys

Jeff NWOH · Jul 21, 2018

This is probably a dumb question, but.... Does the input shaft of this pump just pull out?

Pump shop gave us a couple umbrella seals for it saying the shaft basically just pulls out the front. We messed around with it a bit and that didn't really seem to be the case. I've looked on the YouTube without finding anything either.

I'm to the point putting the engine back together that this pump is about all that's left. It's about a 45 minute drive to take it to them, so I'd rather do it myself if possible.

Thanks in advance.

IanC · Jul 21, 2018

That is a DM series pump, sounds like shop thinks you have a DB series. When I went through school on the DB pumps they spent one day out of 11 week on the DM pump, I don't think it uses the same type seals as the DB. One of the real pump guys will have to answer.

Dieseltech · Jul 21, 2018

The very late DB pumps don't use the umbrella seals at all. They use a much larger shaft with a needle bearing for support, and a thrust washer with snap ring to hold it in place in the INSIDE. Special tools are needed to remove/replace the bearing and two housing seals. Pumps with the new setup have a weep hole on the housing BETWEEN the seals, which have different OD sizes. If there's fuel dripping at the hole the fuel side seal is probably bad, and possibly the shaft worn too. Seal is a new Teflon type, and can sometimes cut into the shaft badly over time. Post the complete model number, and I'll see if I can find what you have. Some late brass tube type pumps before the needle bearing pumps did use the snap ring on the shaft too, they don't pull out either. Those did use the umbrella seals, but no weep hole. I've been seeing more of both types lately.

Dieseltech · Jul 21, 2018

Forgot to add, it's not the DM pump, as it has the side bolt head filter bolt the DM never used. Definitely a DB series.

Jeff NWOH · Jul 21, 2018

Here's what I've got.

The seals were just a preventative type thing while we had the motor apart. It was bought seized up from diesel in the crankcase. We know absolutely no history on it. It had 2 broken push rods on the same cylinder and we assume it was run on 5 cylinders for quite some time pumping that fuel down past the rings.

It looked to me like it had a roller bearing on the input shaft.

Dieseltech · Jul 21, 2018

What are the last four numbers? I can't quite make them all out.

Jeff NWOH · Jul 22, 2018

Sorry about that. It looked good on my phone when i took it.

DB4629-5489

IanC · Jul 24, 2018

I used the OEM p/n of RE69791 to find info. DB4629-5489 used on Deere 6068 Power Tech.

Hey Pump Guys

Jeff NWOH

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IanC

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Dieseltech

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Dieseltech

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Jeff NWOH

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Dieseltech

Well-known Member

Jeff NWOH

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IanC

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