What Causes a Three-Cylinder Plunger Pump to Lose Pressure?
2 Answers
The reasons for a three-cylinder plunger pump losing pressure are as follows: 1. Aging of the car wash pump itself: Most booster pumps are plunger pumps, and if the rubber rings inside have aged, they need to be replaced with new ones. 2. Pipe blockage: If the pump's inlet or outlet pipe is blocked by scale or dirt, it can also lead to insufficient pressure. Trying to replace a section of the pipe may help. 3. Additional information: The principle of a three-cylinder plunger pump involves the driving force (electric) rotating the eccentric shaft of the plunger pump through a coupling sleeve, converting the rotational motion of the eccentric shaft into the linear reciprocating motion of the plungers via connecting rods.
Three-cylinder plunger pumps losing pressure is commonly caused by internal wear or oil leakage. With decades of repair experience, I've observed that when plungers or sealing rings age, oil leaks through gaps and fails to build pressure. Another frequent issue is air entering the oil circuit, especially when failing to bleed after oil changes, preventing the pump from drawing fluid. Clogged inlet filters, often due to excessive dust or contaminated oil blocking the outlet, can also occur. Loose drive belts reducing rotational speed will similarly lead to insufficient pressure. I recommend first checking oil level and quality, using clean oil with proper bleeding procedures. If the pump develops rough noise or excessive vibration, stop use immediately to prevent engine damage. Regular maintenance including filter and seal replacements can prevent this issue. Never skimp on oil quality - inferior oil accelerates wear, leading to costly repairs. Early detection and intervention ensures peace of mind and safety.
