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530 Injection pump

F

FiftyBuick

New User
I am working on my father-in-law's '66 Case 530 backhoe. It died while trying to get it unstuck from a creekbed.(don't ask...) at first, he thought it was out of fuel. After adding fuel, it cranks but won't fire. There is fuel going into the pump, but after removing one of the banjo fittings on the pump, we don't see anything coming out. We removed the pump. Using a screwdriver, we are able to verify the pump spins freely. The input shaft appears to be ok--doesn't wobble. I need info on rebuilding this pump.
Any help obtaining diagrams/ parts lists would be greatly appreciated.
It is a ROOSA-MASTER pump. Sorry, I don't have other info at this time...can get mdl# and s/n.
Thanks
 
afraid you done gave that poor 530 TINKERIETIS..if you had not spun the engine or fuel pump you may had been able to bolt back together , and timed properly ,, OOPS, you are not the 1st bunch of guys to get a little wrenchy TOO SOON ..lol .. ,.MORE THAN LIKELY it would had primed up[ fine had you filled the tank ,or put new filters on there and gave it a pull ,.. 2 choices , get someone there with a IT BOOK that knows deisel motors , or ,, take the time to learn yourself out of the book ... ,, its not hard , BUT REQUIRES A COOL reasoning mind , with a track record of working repairs ..EARNED education is a wonderful thing . it TEACH you ALL understand the importance diagnostic analysis....
 
It's a very common Stanadyne "DB" series pumps called "Rooasmaster" after the guy that invented it, Vernon Roosa.

You say it turns freely? Are you sure the pump is actually turning inside? The driveshaft is designed to snap in half (inside) when the pump siezes. If you were in a creek and got cold water on a hot pump, you might of caused that driveshaft to shear.

Take the little rectangle-shaped timing window off the side and then turn the shaft. You should see something rotating through that hole If not, the pump is stuck and basically, ruined.

Repair info is fairly to get and so are parts.
 
(quoted from post at 09:28:29 06/07/10) afraid you done gave that poor 530 TINKERIETIS..if you had not spun the engine or fuel pump you may had been able to bolt back together , and timed properly ,, OOPS, you are not the 1st bunch of guys to get a little wrenchy TOO SOON ..lol .. ,.MORE THAN LIKELY it would had primed up[ fine had you filled the tank ,or put new filters on there and gave it a pull ,.. 2 choices , get someone there with a IT BOOK that knows deisel motors , or ,, take the time to learn yourself out of the book ... ,, its not hard , BUT REQUIRES A COOL reasoning mind , with a track record of working repairs ..EARNED education is a wonderful thing . it TEACH you ALL understand the importance diagnostic analysis....
Click to expand...

We put fuel in the tank, bled the air out at the filter and tried for 20 minutes to get it fired before removing the line to one of the injectors and finding no fuel to the injector. I would think it should have picked up a prime by then. The timing was not messed with while we were trying to start it. Also, we marked the pump casing and noted the position of the slot the shaft fits into. I don't believe timing was the issue as even if it were not properly timed, it should still push fuel, no?
 

The backhoe wasn't actually IN the water...I am able to insert a large screwdriver into the "drive" slot and and it turns freely. The shaft is intact, so I don't think the pump seized. I'm going to rig a fuel line to the pump and cut the handle off the screwdriver so I can use it in a drill to power the pump to verify the pump's operation.
 
If the pump is working OK, it will inject fuel even when you turn slow by hand. Whenever I fix one, I prime it by turning by hand with a large screwdriver. You don't even have to hook a tight fuel-line to it. I use a hand-held oil squirt can, filled with diesel fuel.

If the pump turns, there isn't much to make it suddenly quit and not even try to start. Sounds like the metering valve is stuck in "off" position.
 
Did you crack all the injectors when cranking? I have had some DB pumps get air locked when run out of fuel. I know this idea will be looked on negatively. But, If I am in a hurry I usually
fire the engine on starting fluid for a few seconds. If the engine was running, does not seem like the metering valve would be stuck.
 
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