Why is there no pressure in the sprinkler truck's water pump?
2 Answers
Sprinkler trucks may experience reduced or no pressure during use due to the following reasons: Pump damage: Check for water leaks or abnormal noises in the pump. If found, the pump needs replacement. Power take-off (PTO) failure: Inspect whether the connecting shaft between the PTO and the pump rotates normally during operation. If not, it indicates a PTO malfunction. Operational error: Incorrect operation of the ball valve switch during water intake or sprinkling. For sprinkling, only the outlet that needs water should be opened; for water intake, only the intake port should be opened. Clogged filter screen: Accumulated impurities in the water may block the filter screen if not cleaned for a long time, leading to reduced pressure. Cleaning the filter screen will resolve this issue. Pipeline damage: Check for leaks in the pipelines and gaskets. If leaks are found, fixing them will restore normal pressure.
The other day when I was driving the water truck, I also encountered a situation where the water pump had no pressure. It took me quite a while to figure out the cause. First, you need to check if the water tank level is sufficient. If there's too little water, the pump simply can't draw it up. Next, inspect the inlet pipe and filter screen—if they're clogged with leaves or mud, clear them out. If there's air trapped in the pump, you'll need to open the air release valve to purge it completely, otherwise the pressure won't build up. A loose or broken belt can also cause this issue, requiring adjustment or replacement. If the impeller is worn or the pump seal is leaking, you'll have to call a mechanic to disassemble and repair it. Another often-overlooked point is a faulty pressure regulator valve—if it malfunctions, the pressure won't rise either. In short, start with simple checks like water level and systematically troubleshoot step by step to save time.
