He are a few problems that PG cant help me with. !. when spraying the ultra and I run under 1 gallon of spray the system stops spraying, After I refill it takes around 1 hour of runnign the machine with the switch on for the spraying to begin. I ve cleaned all the lines, filters but it always happens, My centri you can spray down to nothing re fill and start spraying again. 2 Sometime at first lawn or if machine has sat for a few hours between lawns ( long lunch ) you put it in gear ( high ) and rpm's are around 3100 and the dog just dosent move. flat ground is okay but if you try to climb any type of hill she just dosent move. Rpms's stay high, wheels dont spin. Once the machine has been moving for a couple of minutes ( 10-15 ) she runs fine. All belts are tight. Any ideas?