300 Industrial Stanadyne Injection Pump Issues

Hi everyone, I recently noticed the oil level rising on my JD 300 Industrial and figured it is likely due to the injection pump shaft seals. I installed a complete seal kit, governor ring and a new pilot shaft bushing. Before removing the pump I pulled the valve cover and inserted the timing pin in the flywheel making sure the front-most cylinder was at TCD. After reinstalling the pump the tractor starts and idles well but doesn't rev up much when moving the throttle lever, it just emits more smoke out of the exhaust as if it is getting additional fuel but not accelerating. I ran it with the cover off the injection pump and manually moved the metering valve to the full throttle position to make sure it was not a governor issue but the result was the same. I've removed and disassembled the pump again and don't see anything wrong but I am certainly not an expert with these. Any suggestions would be appreciated, thanks
 
Thanks for the suggestion, the air filter is brand new and it behaves the same with the intake pipe removed. Is there any way to test the advance system? Or even a way to test the pressure the vane pump is making as if I understand correctly that should be directly related to how far the pump is advancing?
 
Did you check the fuel return system all the way? When that plastic dampener fails, chunks of it often get stuck in fuel return boots or
tees on top of the injectors.

Timing advance is easy to check with a clear plastic timing window. They can be bought for $5 or $10 if you shop around. That said, even if
the advance is not working at all, it would still rev up. Just skip and smoke a little, especially when cold.
 
I have not taken apart and cleaned the return fuel path yet but did notice there is flow back into the tank.

When running it without the top cover on the pump to make sure the metering valve was moving the tractor behaved the same way
 
I'm glad you mentioned that, I forgot that I wanted to verify how the orientation of that goes.

Which arrow should match the direction of the shaft rotation, the arrow on the governer basket side of the cam ring or on the pump head side?

Right now, from looking at the pump from the input shaft side which rotates CW, the arrow on the cam ring on the governor basket side is also pointing CW

I appreciate all the input thus far
 
Clockwise pump when looking in from the drive side.

You ARE talking about a DBGFC or a JDB pump, correct? Just making sure you don't have a CDC.

I never put a cam-ring in backwards and so cannot say what would happen if you did? Same goes for the fuel-transfer punp liner in back
that runs the timing advance.

I know on my 300B, when my pump crapped out - and I fixed it out in the field? After fixing the injection pump and sticking it back on,
the engine kept on losing RPMs and then quitting. I found a chunk of plastic stuck in one of the fuel-return books on top of one of the
injectors. My 300B obviously had a CDC pump at one time since it has an adapter to make the JDB pump bolt to the engine.
cvphoto23169.jpg
 
Here is what the clear plastic timing window looks like. We used to sell them to customers for $5 at our Deere dealership. Thompson Diesel
was sell them for $7 each a few years ago. I bought a dozen of them at the time. Some of this stuff is getting scarce. I have lent many of
them out and not gotten them back. No more loans. It was a nice feature on the pumps used on Deere tractors. Made it easy to check the
timing advance and adjust when needed on a running engine. JDB and DBG pump used a rectangle-shapped window, and the C pump used a round
one.
cvphoto23170.jpg
 
It is a JDB pump which appears to be the original on this 300 as there is no U shaped adapter bracket.

I do recall the vane pump liner has the side with the C facing the back side of the pump, I'm pretty confident that's how it came apart.

I'm tempted to flip the cam ring and tgive it a try, I forgot to take a picture before I removed it the initial time and at this point don't really know what else to try.

Thanks
 
I have wondered why my 300B has the U-shaped adapter. Maybe the engine was swapped at one time? My 300B is a 1977. 300 is older. I have a
1966 300 but mine has a gas engine. My 300B has the U-shaped bracket and the JDB332-2732 pump which is what Deere sold in a conversion kit
to replace the C pump.
 
It looks like the housing has only one timing advance feed port, on that side there is a piston with a ring on it. The other side has an externally threaded adjustment.

Below is how I have had the cam ring installed. The pump shaft rotates the same direction that the visible arrow on the cam ring is pointing.



mvphoto36134.jpg


Again thanks for all the suggestions
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Just wanted to follow up with what the issue turned out to be.

I never noticed that I had left the thrust plate in the parts washer, didn't notice it until today. After installing that the tractor is back to running well. I appreciate all the suggestions along the way.
 
Interesting. Cannot say I ever ran one with no thrust plate so cannot comment on what happened? No transfer pressure for the timing advance
and no feed/charge through either. Did you have a good flow of fuel from gravity or the engine-mounted fuel pump? Just curious. Just
wondering if the lack of the ability to rev was from no advance or from no fuel availability. I have run machines in the past with no
working advance and they did not run as poorly as you described.
 
There was still a fair amount of fuel flow out of the pump housing return.

I am somewhat surprised the amount of pressure provided by the lift pump was enough to push the pump rollers out into the cam enough to run
 
Some gravity fed CAV DPA Ford pumps use no supply pump, and at cranking speed on the test stand the transfer pump barely makes 10 PSI do to the internal head venting orifice. Long as the plungers are moving freely five PSI will move them fine.
 

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