Essential Safety and Operational Guidelines for Water Sprinkler Trucks 1. Before engaging the water pump and power take-off (PTO), at least one spray nozzle ball valve must be opened to prevent pipeline overpressure upon pump startup. Failure to do so may damage the rubber gasket at the pump outlet—or, in severe cases, cause internal pump damage due to excessive pressure buildup. 2. The clutch pedal must be fully depressed before engaging or disengaging the PTO. Engaging the PTO without fully depressing the clutch may result in gear tooth damage. Additionally, vehicle air pressure must be sufficient—no less than 0.8 MPa (8 bar)—both when engaging and disengaging the PTO. 3. When drawing water, ensure the pump is primed with water prior to operation. It is recommended to retain a small amount of water in the pump after each spraying cycle. If the pump is dry, manually prime it with water to prevent dry-running, which can overheat and destroy the mechanical seal. 4. During sub-zero winter temperatures, all pipeline valves must be fully opened, and the drain valve located beneath the pump’s inlet must be opened to completely evacuate all water from the pump. This prevents freezing-induced cracking or rupture of the pump housing. In extremely low temperatures, store the sprinkler truck indoors (e.g., in a heated warehouse) and insulate the pump and all ball valves. 5. A T-shaped strainer is installed between the water intake and the pump inlet. Periodically remove the four screws at the bottom of the T-strainer to extract and clean the filter screen. Clogging of this strainer can lead to insufficient pump pressure. Avoid drawing water directly from rivers or streams whenever possible, as fine sand and gravel may bypass the strainer and enter the pump, causing impeller wear. If river water extraction is unavoidable, install an additional, finer-mesh pre-filter—but note that doing so may reduce suction flow rate. 6. While the sprinkler truck is in operation, maintain engine speed between 1,000 and 2,000 rpm. High-speed operation is strictly prohibited. 7. When ceasing operations, first depress the clutch and disengage the PTO, then close all ball valves.