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QUESTION:I've got the pump, two White Hydraulics roller stator motors, skid
steer tires and wheels, all the 3 inch double action cylinders I need
for the loader and backhoe arm, the steel frame partially welded
together. All that's missing is the directional valve bank, the
hydraulic system circuit and hook-up.
ANSWER: If you plan on controlling the wheel motors with regular spool valves
like are normally used on double acting cylinders, be sure to use a size
larger than the lines you will be connecting to it. Spool valves have
pretty convoluted flow paths and add a lot of resistance / friction,
particularly when you are "feathering" the controls which will heat your
hydraulic fluid. Going a size larger will help limit the heating, but
you should still have a hydraulic oil cooler in the system. Most
commercial equipment uses hydrostatic pumps (one per wheel motor) which
provide a variable flow in both forward and reverse to drive the wheel
motors so they don't have the heating problems you'll have with spool
valves. Put a hydraulic fluid temp gauge on your dash somewhere so you
can see if you're pushing the machine too hard.
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