Roosamaster injector pump

hemmler76 · Feb 13, 2009

I have an Allis Chalmers with a Roosamaster D series injector pump. It was running fine and used everyday then acted like it had a bad filter. I put a new filter on and it was getting fuel. I bled each injector which had fuel. Injector would cause the engine to miss when I bled each one separately like should happen. Then it ran fine for 2 hrs. It sat over night and it was back to square one. Tractor would be idling and just shut off on its own. Starts right back up with no problem.

Brian Jasper co. Ia · Feb 13, 2009

There is a nylon ring that the governor weights are attached to that over time deteriates. The little bits of the ring will clog the return line and cause the pump to hydraulically lock making the engine stop. You can pull the return fitting out of the pump, and if you find little particles floating around, it's time for a new governor ring.

Anonymous-0 · Feb 13, 2009

That is exactually what happened to our JD 5020. I went through the filter change just like you did with the same results. It just keep getting worse. finally we had the pump rebuilt. I think it cost around 550.00 Stan

Wesley Stephens · Feb 14, 2009

we're waiting on the part to fix the same problem on a Case engine.

Anonymous-0 · Feb 14, 2009

check for a air leak,not fuel leaking . Had that happen on my 190.Leak was atsediment bowls.

JDemaris · Feb 14, 2009

Very common for all the Stanadyne Roosamaster D series until 1985. After that, a different updated dampener is used.

Complete seal kit with new pellathane dampener is $15. It takes an hour, start to finish, to take the pump all apart, fix, and put back together.

Most pumps, by the time that ring falls apart, need a few other hard parts. Total cost is usually less then $50.

Sending to a shop, in my opinion, has always been way overpriced. These pumps never get truly rebuilt, just patched up and often a $500 - $600 repair bill gets you $30 in new parts and an hour or two in actual labor.

Replacement parts are available for sale to anyone and shipping is fast when ordered from the right place.

Bill Shafer · Feb 14, 2009

Also be sure and change the check valve on top of the pump. Has a glass ball in it and will look clear but is not. I use a shop to rebuild the pumps that I need worked on.The owner is real picky about rebuilding pumps. It has to meet his standards or you do not get it back until it does.He will even let you watch the rebuild and testing if you have the time.Just do not tell him you want a patch up job,because he will show you the door.

JDemaris · Feb 14, 2009

They all don't have that pressure regulator/check valve with the ball. Some use a vent-wire instead.

All those pumps that get fixed are technically "patch jobs", regardless who is doing the work. Major parts do not get renewed like is done when an engine gets rebuilt. Most parts get reused, as is - just all is tested and checked and/or cablibrated when done. I think the term "rebuilt" when it comes to these pumps is misleading. They are all patched up, resealed, sometimes updated, and recalibrated - that's all.

Wilsonfire · Feb 14, 2009

I look at a pump rebuild like a four barrel carburator rebuild. Getting it de-gunked and new seals, along with recalibration is most of the issue. You must decide if you are mechanically competent enough to do a good job. Don"t forget use a metal governor ring if you intend to keep the tractor. I fought the "Clean out the pressure return, clean the tank and lines, etc" battle for weeks and finally gave in to a rebuild. It has run like NEW ever since and I am glad I spent the money to get it done right the first time. You"ll likely have to change fuel filters a couple times afterwards. Wilson

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