A few weeks back I posted a question about a power trol issue. that being that it would not lift a disk. Here's what I've done since. First I hooked up a test pressure gauge to power trol. ( let me state that these outlets were plumbed out of the plugs on side of power troll with dummy plugs.)At first pressure was around 750lbs. After a few cycles of power trol lever, pressure held at about 350lbs. This to me seemed low. I reworked outlets with plugs for cylinder. I removed and inspected relief valve spring, looked fine. removed two check valves and poppets, looked fine. removed and checked metering screw, looked fine. Pump looked good when I had it apart 2 yrs. ago, what are your guys thoughts as to my low pressure problem. thanks Greg