I just traded in my 3039R for a 4066R with 3rd, 4th,5th scvs. Love the extra power and abilities, but have one issue. When engaging the 3rd scv to power the grapple from the thumb switch there is a loud metallic slapping sound coming from the solenoid in the back just below the 4/5th scv. It sounds like slapping a large wrench against the roll bar. Very loud too (varies with RPM), wife can hear it in the house 70ft from the barn with engine at 1500 rpm.
I know that is not the solenoid for the 3rd scv as that one is underneath. I also know it is not accidentally being triggered as the same happens even when that one (dealer says it is for the continuous oil) is unplugged.
Seems like somehow the general pressure in the system is causing it. It happens most when half cycling (closing or opening the grapple part way).
Dealer is unsure if it is normal, seems way too loud to me to be. I've had 3rd scv on the 3039R and a 4310 and neither made a noise even close to this, but this does have that continuous function that they did not.
Would appreciate experiences of any of you with a similar setup. Could it somehow be plumed wrong or that is just its nature?