vacuum pump repair

What Are the 5 Signs of Vacuum Pump Failure?

November 24, 2021

Even the most well-constructed vacuum pump can fail after extended use. In industrial applications, for instance, the downtime resulting from pump failures can be prohibitively expensive — especially if it forces production to grind to a halt. 

As vacuum pumps are found in everyday technology, consumers are also impacted by pump failure. The rattling sound of a failing car engine pump, for example, illustrates that your car engine needs repairs.  

Knowing the signs of vacuum pump failure is crucial in maintaining a functioning system and avoiding dangerous or expensive issues resulting from failure — like being stranded after having car engine issues or missing shipments when your production line halts. Here, we unpack five of the most common signs of vacuum pump malfunction. But first, let’s explore why maintenance schedules are key in avoiding vacuum pump failure. 

Maintenance schedules and clues from a failing vacuum pump

When a vacuum pump fails, it rarely occurs without warning.

But it can be challenging to know what an optimally functioning vacuum pump looks like. This is because vacuum pumps are almost always incorporated into larger systems while being used for varied-use cases. As a small part of a larger system, it’s also difficult to assess when pump maintenance is needed until production is affected. 

Despite this, proper maintenance is required to identify when vacuum pumps are near to failing. Without maintenance, you risk being caught off guard by unexpected downtime and the cost of repairing or replacing a pump. Creating a maintenance plan helps you avoid pump failure and ensures you fix system leaks before any issues or telltale signs arise. These plans should be guided by the owner’s manual, the project environment and the material being pumped. 

Your maintenance plan should allow for the servicing, repair and replacement of pumps. For smaller projects, this may involve sending pumps back to the manufacturer. With this in mind, here are the common signs of a failing vacuum pump: 

Common signs of a failing vacuum pump

1. Increased noise

When your vacuum pump exhibits loud or atypical noise, then it may be close to failure. Throughout their use, ageing and accumulated wear cause a specific part in the pump to fail. Increased noise is often a sign that a pump requires maintenance and cleaning. While parts like diaphragms, valve plates and seals are easily replaced, increased bearing, motor or air noises may indicate that more extensive repairs are needed.

2. Extended processing times

If dirt or other contaminants enter the vacuum pump chamber or valves, overall pump performance can be impacted. When pumps need more time to accomplish operations, they may be in danger of failing. 

At this point, thoroughly cleaning your pump and ensuring that no contaminants reach other parts is a necessity. Without this step, these contaminants will continue affecting pumps, leading to more maintenance or repairs. Filters are also valuable in preventing contaminants from entering your system.

3. Overheating and constant restarts

It can be difficult to diagnose vacuum pump failures resulting from heat buildup. Factors may include having a bad motor, incompatible pump applications or poor ventilation. Constant overheating may indicate a malfunction. 

When troubleshooting for an overheating pump, first assess the pump ventilation openings. If these openings are blocked or are too close to another object, fixing this issue may be as easy as resituating the pump.

4. Your vacuum pump won't turn on 

If a pump won't turn on, it may be a fuse issue. First, check if the pump’s fuses are blown. If your pump works and there are no issues after you’ve replaced the fuses, then you’ve fixed the problem.   

But if blown fuses are a continuous problem, then you may have a power issue — or you’re using a voltage that is too high for your pump.

5. Slow starts or standstills

Establishing a regular maintenance schedule is key to preventing vacuum failures before they occur. Another step to preventing failure is to look out for the five signs shared above. 

But preventing vacuum failure is only one step in maintaining a safe and reliable vacuum system. Read more about preventive maintenance.

Leybold employee

Let's talk

We focus on customer proximity. Contact us for all your questions.

Contact us