I am going through my arrows system at the moment and yours is one of the issues I had to work out. First you need to understand that the GIT light circuit and the gear pump circuit are completely unrelated. The GIT light is controlled exclusively by the gear UP micro switches and that is all they do, when all 3 switches close the light goes off. If the light comes back on one of the switches has opened which means the switch is either intermittent or one of the gear legs has dropped enough to open the switch. From my experience if there is an intermittent switch its usually the nose gear UP microswitch due to exposure to heat, vibration and fluids. If the problem is not a switch then there is a pressure drop in the system and there are two things you need to check. First put the plane on jacks and raise the gear. Then shut off the master, go home and come back tomorrow. Next day check for any sagging, if there is then you have a leak somewhere. IF you do then I suggest pulling all three retract cylinders and installing new O rings. They are pretty easy to do but do some research on how to get the retaining clip out of the main gear cylinders, its a weird one. The parts manual specifies the O ring size, common stuff. It’s also important to replace the O rings in the Hoff valve in the emergency extension system. Piper lists it as not serviceable and wants $1500 of cash to replace it. Take it out, unscrew the service cap and replace the 2 O rings on the shaft and the one under the service cap. I have the MS numbers for the O rings if you need them. There is one more problem that I found after correcting all of this and that is the high pressure switch that controls the gear pump motor. On the retraction cycle this switch shuts off the pump when the system pressure builds to 1800psi, this is your uplock pressure that holds the gear in the well. It takes about 600psi to cycle the gear on the jack stands. The springs in these switches lose tension over time causing your pump to shut off at progressively lower pressures. It will manifest itself by the GIT light coming on in turbulence because there isn’t enough pressure to keep the gear tightly up but not low enough engage the pump. Eventually you will select gear up and the gear will retract part way and stop. Guess how I found this out? The switch is only made by Eaton and most piper parts suppliers want about $800 for it but I know a supplier in Alaska who has a contract with Eaton and can get them for $650. Still high but Eaton is the sole source of supply. The switch is under the rear seat as is the Hoff valve. As you are facing aft the Hoff valve is in the assembly on your right with the two rigid hydraulic lines going to it and a rod extending forward to your emergency gear lever. The pressure switch is on the left threaded into the UP manifold. It’s about the size of a 35mm film can.
