I have a Scag Tiger Cub with 806 hr on it. The problem I am having is when I pull back on the L/H direction control to go into reverse; it seems it goes into neutral (lack of a better term) then it will finely change into reverse. Over all the pump and Hydro motor seems to be working OK, except at times it's slow to change to reverse direction on the L/H side only. Going forward never a problem. Happens most offend when it's cool however it can happen any time. Pump Part No. is BDP-10A-316. Any ideas?