With the bypass valve open, pump flow goes back into the tank. Partially close the bypass valve to create pressure for spraying. The more you close the bypass valve the higher the pressure. The pump will shut off when the pressure reaches the pump's limit. If you close the bypass, the pump will...
Reach in the tank and pull the hose down some. I have 25 Gallon Workhorse with 5.3 GPM pump. The suction hose on mine is flattened out some at the bend, but it works fine.
I go over my driveway a couple times with the scarifiers down. First pass I shorten the top link so the blade is not grabbing anything. Then a few passes as need with the top link set so the blade moves grave to fill pot holes and dips. Typically leave scarifiers down for this to make sure edges...
Example of power beyond plug in a Prince valve. Some valves are different and have an adapter with o-rings to seal the high pressure from the tank circuit.
I use the backhoe swing pump connections for my rear remotes. No permanent piping changes needed. Just use the swing pump quick coupler and the backhoe drain line quick coupler. I don't need the remotes when the backhoe is on.
Your loader lifting capacity will be significantly more at 4 feet verses max height. For example, my L39 is rated 2767 lbs at the pins and max height. at 4 foot height it is rated about 3500 lbs. 500 mm forward the pins or edge of the bucket at 4 foot height it is rated about 2860 lbs.
(y)on the gauge wheels. I have an 84" Land Pride landscape rake. Difficult to get a level grade without the gauge wheels. I even added brackets to my box blade so I could use the gauge wheels from the rake on it.
When I had an RTV500, remember making a significant improvement in performance by adjusting the throttle/HST linkage. The foot pedal controls both the throttle and the HST. You can adjust the linkage so you get to full throttle sooner in the pedal travel.
I like the hydraulic self level on my L39. It does need periodic adjustment. There are two adjustment screws on the loader valve, one for raising and one for lowering. Not too hard to do other than a bit of hassle to get to the screws. I just eye ball it and don't use any sort of leveling gauge...