Posted 5/14/2022 23:10 (#9660801 - in reply to #9660778) Subject: RE: $100 to first right answer/ Case 1200pt fertilizer pump issue
North Liberty and South Bend, Indiana
The impeller spins very easily by blowing through it but I am not sure how to test if it's sending signal to the computer to then command pwm valve. Flow meter is a year old but could have failed and I stated that several times. But that still doesn't explain why the fert pump runs at a normal speed with vac fan off but overspeeds with vac fan on. Did determine there is 500 psi in the pressure lines with vac fan off and jumps to 2500 psi with vac fan on. I couldn't see anywhere where pressure would be reduced going to fertilizer pump motor but thought was maybe its getting over pressurized. Even more weird is if you pull vac fan pwm coil off the stem so motor doesn't spool at all the fert pump runs normal.
I'm leaning towards a bad flowmeter but the direct tie to a spinning vac fan is just odd.