JUGS Sports Curveball (2 wheel) Pitching Machine - Manual (Page 26)

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Maintenance
Review the following instructions carefully to maintain maximum
accuracy with your Jugs Pitching Machine.
• Maintain tire pressure at 16 to 17 psi (25 psi for tennis balls).
Cleaning
• Keep machine clean, and free of grit and dirt. Always use a clean damp
cloth when cleaning. Never use brake fluids, gasoline, petroleum-based
products, or any solvents to clean machine.
• Periodically, you must clean the tires to help maintain their maximum
performance. A dirty tire can easily be distinguished by either a dark ring
around the tire surface or when the surface itself has turned yellow and has a
very glossy or shiny finish.
• In order to begin cleaning, you must first inflate the tires to approximately 17
pounds.
• Take medium grade sandpaper (sometimes an even coarser grade is nec-
essary depending on the amount of soil buildup) and begin to scrub the
tire surface as you would a very dirty frying pan. This process can be very
tedious and could take up to 10 minutes per tire. However, it is necessary in
order to completely clean the rubber of all foreign substances, as well as
prepare it for better machine performance. You should sand the tires when-
ever you notice the soil build-up forming. Always sand tires with the power
switch Off and the machine unplugged.
Once you complete this operation the tire surface will, in most cases, take
on the white color it was originally. Maintaining the tire in this fashion will
not only maximize the performance and accuracy of your machine, but it will
extend the life of the tire.