Why Equipment Breaks Right After Maintenance: Key Causes & Prevention Strategies

Preventive maintenance (PM) is designed to keep machinery running smoothly by addressing wear before it turns into a costly breakdown. Yet, incidents—such as the Sugarloaf Ski Resort lift failure that injured seven riders just one day after a routine PM—highlight that post‑maintenance breakdowns do occur. Understanding why can save time, money, and lives.

Common Reasons for Post‑Maintenance Failures

1. Defective Replacement Parts

GP Allied’s whitepaper, Are You Doing Too Much PM?, notes that invasive PM tasks can inadvertently introduce faulty components. If a replacement part is compromised and the job is rushed, the defect may go unnoticed until a critical failure.

2. Improperly Executed PM Procedures

"PM creep"—the gradual expansion of a maintenance program beyond what’s necessary—can lead to over‑maintenance. Excessive downtime and redundant work not only erode productivity but also increase the risk of errors during each session.

3. Ineffective Maintenance Actions

When maintenance steps—such as sealing a gasket—are not performed correctly, the equipment’s integrity is compromised. These lapses are especially risky in high‑stakes, invasive PM tasks.

4. Damage Uncovered During PM

Technicians can unintentionally harm one component while working on another. A seemingly routine disassembly can expose hidden vulnerabilities that later trigger failure.

5. Misunderstanding Optimal Operating Conditions

Continuous, overly frequent servicing can mask the true conditions under which a machine performs best. Without clear use‑case data, teams may keep an asset offline longer than necessary.

6. Human Error

Time pressure or inadequate resources can lead to wrong or incomplete tasks. Even experienced technicians are not immune to mistakes, especially in fast‑paced environments.

Bottom Line: Two Core Causes

Post‑maintenance failures generally fall into two buckets: improper work and unnecessary work. Stuart Fergusson, Solutions Engineer at Fiix, aptly summarizes: “People think there’s no such thing as too much preventive maintenance. False. The real question is: What are we doing that we don’t need to, and what are we doing that we don’t know how to do?”

Answering that question requires a data‑driven PM optimization strategy—a topic we’ll explore in next week’s blog post. Until then, consider these resources to deepen your understanding of equipment reliability:

Further Reading:

• 5 Causes of Equipment Failure (and What You Can Do to Prevent It)
• The Short Guide to Preventive Maintenance
• What’s the Cure for Unplanned Maintenance?