I checked the return hose from control valve no fluid. the fluid is coming from a 1/4 id return line that runs down the top of the rear lift cylinder, supply line fron control valve goes to a junction block mounted on the mast, from there a line goes to the free lift cylinder and a second line fron the junction block goes to rear lift cylinder. so fluid from free lift to lower down is coming back to the junction block then down through the rear lift cylinder. i capped this 1/4 inch line and it solves the dropping issue but ofcorse the rearlift cylinder cant raise after max free lift, someone mentioned check valve where would this be? or any other ideas?