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I’m having trouble with my control pressure dropping when I engage my unloading auger on my 9230.
 

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There is likely a leaky seal on your unloader clutch then. You can engage the separator and watch the pressure it should start at about 320, drop to around 300 give or take, then recover to within 2-3 psi where it started. Then engage feeder house and same thing should happen, then engage unloader and see where it drops to. I imagine the seal on your piston is leaking on the unloader clutch but it is possible it is the valve stem, that would be the easiest to check.
 
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