SHIELD AS 5099387 - Caterpillar

1. Spray bar switch - turns the water spray system on ("Spray Bar") or "Off" by engaging or disengaging the magnetic clutch on the spray system water pump.2. Water pressure gauge - shows the discharge pressure of the spray system pump in pounds per square inch (PSI). Normal pressure is 50 to 65 PSI, but is dependent upon the amount of water being used. 3. Filter pressure gauges - show the water pressure on each side of the filter in pounds per square inch (PSI). The water inlet pressure should be 60 to 65 PSI. The outlet pressure with clean filter elements should be 45 PSI. The filter elements should be changed if the outlet pressure falls below 40 PSI with the spray system operating.4. Spray bar pressure gauges - show the water pressure in the spray bars in pounds per square inch (PSI). Normal pressure is 15 to 30 PSI. 5. Optional high pressure (washdown) water system on-off control - turns the flow of control (auxiliary) hydraulic oil to the optional high pressure water pump motor "On" or "Off", thus turning the high pressure water flow on or off.6. Optional high pressure (washdown) water system flow control - controls the volume of control (auxiliary) hydraulic oil flowing to the motor that turns the optional high pressure water pump. This regulates the volume of water pumped and, as long as the spray gun nozzle is open, the water pressure.