Sydwayze-Check your PM's for the name of someone you can PM to provide help. If you look at the Merc manual, you'll see that the Prestolite,Oildyne, Kiekhaefer pumps all operate at different up/down pressures. Are all Kiekhaefers the same? I don't know. The trim pumps with the black metal resevoir with the notch at the very top of the cap for the solenoid bracket will be either Oildyne p/n 818161A4 or Kiekhaefer p/n 846859A1. Both have the black plastic dipstick half way down the pump assembly. I don't recognize the screw you're referring to unless someone replaced the dipstick with a piece of hardware. By the way, the dipstick has a groove in its side to vent the resevoir. Merc says tighten it and back it out 1 1/2 turns. This can be a complex issue. Just went through it with one of my trim pumps and SSM's. Running the drive up/down won't always get the air out. You may have to crack the lines and bleed where they attach to the hydraulic ram next to the Gimbal ring. A quick check to see if you have air is to run the drive all the way up and then try to manually force it down. If it moves more than 1/8", you've got air.If not air, it could be the shuttle valve has debris on it or the internal pump itself. Parts are available to repair it. Try to see the Merc manual to give you more info. I'm purposely being brief here due to the complexity. It sounds like the solenoid is engaging, but I can't be sure from your description. I'm just trying to get you started here until the endless resources of OSO kick in.