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Is my injector pump bad?

J

Josh in Pa

Member
I was baling over the weekend with my Oliver 1655. In the few hours of baling, maybe 5-10 times I would start down the hill and it would "surge" and pick up several hundred rpm. Coming back up the hill I noticed a few times it seemed sluggish, but when I gave it throttle it took right off. I finished up, and had several miles on the road to get home. On the way home it lost power and started to miss and put out black smoke under a load. It still idles ok. Several years ago something similar happened and I had the pump rebuilt and all was ok. That was only several hundred hours of running time. I"ve used ultra low sulfer diesel in it, but only with an additive. Is it time for a new pump already? If so, am I correct in thinking I have to wire the throttle full open to remove the pump? Thanks for any advice,
Josh
 
Sounds like the inertia ring in your pump has started to come apart. The pieces tend to plug the return line and then they can run bad or stall. Then you might have a start stall condition. Your filters are clean right? I don't think you need to wire the throttle open to R & R the pump. You might try asking Larry Harsin. Check out "Ask The Oliver Mechanic".
Ask The Oliver Mechanic
 
Look in return line for little black plastic particles plugging it if so it's the ring in pump gone bad. Pump shops are suppose to put the steel one back in so make sure they do this time no plastic.
 
One of mine did the same thing earlier this year. a new filter cleared it right up. I seem to have good luck trying the easy fixes first. Good Luck.
 
Wire it wide open , take it off and to a pump rebuild shop. Those plastic rings often will go bad after only 3 years. Have the rebuilder install the new style governor weight retainer that has no plastic ring in it.
 
If it's the Roosamaster/Stanadyne D series pump, you DO need to wire the throttle to full position. That puts tension against the governor flywieghts and thrust washer inside the pump. If you don't tie it - the thrust washer falls out of position once the pump is pulled off the driveshaft.
 
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