What are the reasons for the Sinotruk HOWO's air pressure not building up?
3 Answers
There are several reasons why the Sinotruk HOWO's air pressure may not build up: 1. Softened internal spring plate: Over time, the internal spring plate in the air pump may soften, preventing it from springing back when the air reservoir reaches a certain pressure due to the back pressure from the reservoir. This issue typically limits the maximum pressure to 4-6 kilograms. 2. Clogged air pump tube: Checking for a clogged tube is straightforward. Simply disconnect the air pump tube from the dryer, start the air pump, and if black smoke-like substances come out of the tube, it indicates a clog. The solution is to replace the air pump tube.
I remember when driving the HOWO truck, the issue of air pressure not building up was quite common. Mostly, it was due to problems with the air compressor, such as internal wear or a loose belt causing insufficient compression. Air leaks at the air tank or pipe connections were also frequent; applying soapy water around these areas would reveal bubbles. A clogged dryer was another hidden culprit, where accumulated moisture froze the pipes, naturally preventing the air pressure from rising. If not fixed promptly, the braking system could lag, making it dangerous, especially on steep slopes. It's advisable to first check the compressor's operation sound yourself. If it's humming but the pressure isn't increasing, head straight to the repair shop for part replacement or tightening. Regular maintenance should focus on cleaning the air system to avoid unnecessary expenses and risks.
Years in the transportation business, low air pressure has given me headaches multiple times. It's usually caused by air leaks—those aging air hose connectors or cracked seals preventing pressure buildup. Compressor failures are also quite common, especially during cold winters when they're harder to start. When the air pressure gauge stops moving, never push your luck—pull over and inspect critical points like the safety valve or regulator for jams. Delaying repairs not only disrupts deliveries but could also lead to brake failure and accidents. Find an experienced mechanic for a proper diagnosis—getting it fixed right the first time beats repeated headaches. During routine oil changes, take a quick look at the air system—it saves a lot of trouble down the road.
