How to troubleshoot a vacuum pump that is jammed and won’t start

2026-11-02 

Vacuum pumps are now widely used across many sectors. With advantages such as a long service life and low investment costs, they are subject to relatively high performance requirements, which in turn places greater demands on installation techniques. Let us now take a look at the methods for resolving issues where a vacuum pump becomes seized and fails to start.

Vacuum pumps frequently become seized during operation. To prevent this problem, it is important to note that excessive limescale build-up can cause the pump to seize, rendering it inoperable and leading to damage to the mechanical seal and bearings. By removing limescale, replacing the mechanical seal, bearings and valve plates, and adjusting the clearances, the vacuum pump can be restored to normal operation, with its pumping capacity significantly improved—even exceeding its performance when first purchased.

The above outlines the methods for resolving issues where a vacuum pump seizes up and fails to start. We encourage you to familiarise yourselves with these procedures, as the increasingly widespread use of vacuum pumps—driven by their various advantages—means they are becoming ever more prevalent. Should you have any queries, please do not hesitate to contact us; we will provide professional advice to help you avoid losses resulting from improper use.

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