Troubleshoot the Heat Before It Becomes a Bigger Problem

When a positive displacement (PD) blower starts running hotter than usual, it’s more than a minor inconvenience—it’s a signal that something’s not quite right. These systems are built for endurance, but when excess heat enters the equation, performance issues and long-term damage can follow if left unchecked. Make sure to discover why the root causes of overheating. That is the first step to addressing the issue before it compromises your operation or leads to expensive repairs.

One of the most common reasons a PD blower runs hot is due to airflow restriction. Any blockage, even a partial one, in the inlet or outlet can force the blower to work harder than it should, which naturally increases internal temperature. This might come from a dirty filter, a clogged pipe, or a valve that’s not fully open. When air can’t move freely, pressure builds up, and the blower has to compensate—leading to overheating and mechanical stress that could shorten its lifespan.

Another factor could be improper lubrication or the wrong type of oil. PD blowers rely on precision lubrication to reduce friction between moving parts. If oil levels are low, contaminated, or not suited for the blower’s operating conditions, the components inside can overheat quickly. Regular oil checks and scheduled maintenance help catch this before it turns into a major issue. Even ambient temperature can play a role—if the blower is installed in a poorly ventilated or high-heat environment, heat dissipation becomes a challenge. A lack of cooling airflow around the unit can raise internal temperatures significantly.

Misalignment or excessive belt tension is also a frequent culprit. When belts are too tight or components are not aligned properly, extra strain is placed on bearings and shafts. This not only creates unwanted heat but can also lead to vibration and wear that further degrade performance. Precision in setup and regular inspection is key. And if the blower is oversized or undersized for the application, it’s going to struggle to keep up with system demands in an efficient way—which often results in unnecessary heating.

The good news is that most causes of PD blower overheating can be diagnosed and corrected with a thorough system review. Whether it’s adjusting the installation, replacing filters, checking lubrication, or revisiting system sizing, taking action early keeps everything running smoothly. High temperatures aren’t just uncomfortable—they’re a warning sign. Staying ahead of the heat means better blower health, fewer disruptions, and longer equipment life.