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roosamaster pump

R

russdog

Member
Hi, First time on here. Have a Roosamaster injection pump off a jd350c. I went thru it a while back and have rebuilt the motor and some other work. I went to start it up and it runs wide open. The electric shut off solenoid works as I can hear it and visually watch it thru the return line port.It moves the metering valve but nothing changes. Could the metering valve be not working. Thanks, Ken
 
I rebuilt the pump about a year and a half ago and put the updated retainer and it all went together pretty good. It wasn"t started until now so it has sat awhile.The gov weights went in good at the time I rebuilt it. Could they have stuck while it wasn"t being used?
 
Take the solenoid cover assembly off and check the metering valve for free movement. If OK replace the cover this way, using two wires ground one terminal, and use a second on the hot terminal with battery to make sure the arm is pulled back, then set the cover straight down back in place. Sometimes if the cover is put on the arm can hold the linkage wide open, and the governor can't shut it down. If this is not the problem, was the metering valve replaced? There are two sizes. If a standard size is used on a head with an oversize bore it will never shut down right.
 
I don't know what exactly you are seeing through the return-line port -but I doubt you can see the metering valve. Probably just the linkage that's hooked to it. The electric solenoid had NO mechanical connection to the metering valve. When energize - it pull a metal arm out of the way of a spring -and it's that spring that pulls the metering-valve open. Long story short - I think you need to find out if that metering valve itself is actually moving back and forth. There is a steel arm clipped onto the top of it. Take the cover off the pump and make sure that clip is still tightly attached and make sure that valve rotates back and forth OK. If so, then check the linkage that is connected to it for binding. The metering-valve itself pretty much HAS to work if it moves - unless it's worn out OR has air in it.
 
You are right. When I take the return line fitting off the top and energize the solenoid I can see the linkage moving but I will check to see if it is actually attached to the valve. Thanks, Ken
 
I took the top off the pump and all the linkages appear to be free and intact. What do you mean air in it? How wood this bleed out? Thanks, Ken
 
The pump is self-bleeding. It only gets air-bound if air is entering the pump from the fuel source. Like a bad fuel pump, plugged filter or strainer, etc. The injection pump itself has a fuel pump built into the back of it. If the fuel line is somewhere blocked - the injection pump will created a suction against it and can sometimes suck air from any weak spots.

Besides the linkage - did you check the actual metering valve to make sure it's moving?
 
I did check the metering valve itself and it does move with the linkages.Everything seems to work good. Could the metering valve itself be defective? I replaced all the vanes in the back of the pump when I rebuilt it.It all seemed to go together good. Is there something on the metering valve that could go bad? Thanks,Ken
 
When I put the cover on I put it down then slide it over pushing the linkages back. When I energize the solenoid I can see the linkage moving thru the return line port.I used the metering valve that was in it when I rebuilt it.Is there a way to install them backwards? Thanks,Ken
 
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