How Increasing Wrench Time Improves Maintenance Performance
Discover how improving wrench time can increase maintenance productivity, reduce downtime and support greater asset reliability.
How Increasing Wrench Time Improves Maintenance Performance
When maintenance teams look for ways to improve productivity, increase asset reliability and reduce maintenance costs, one metric often provides significant insight: wrench time.
Although it may sound simplistic, wrench time is one of the most important indicators of maintenance efficiency. It measures how much of a technician’s working day is spent carrying out productive maintenance activities rather than waiting, travelling, searching for materials or dealing with avoidable delays.
Many organisations are surprised to discover that their technicians spend considerably less time performing maintenance work than they expected. Improving wrench time can unlock significant productivity gains without increasing headcount or maintenance budgets.
What Is Wrench Time?
Wrench time refers to the percentage of a technician’s shift spent performing value-adding maintenance activities.
Examples of productive maintenance work include:
Equipment inspections
Preventive maintenance tasks
Repairs and replacements
Fault diagnosis and troubleshooting
Testing and commissioning
Adjustments and calibrations
Activities that do not contribute directly to maintenance execution are not considered wrench time.
These might include:
Searching for spare parts
Waiting for permits
Travelling across site
Looking for tools
Waiting for instructions
Attending unnecessary meetings
Rework caused by poor planning
Whilst these activities are often unavoidable to some degree, excessive time spent on them can significantly reduce maintenance efficiency.
By Paul Deighton
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How Is Wrench Time Measured?
Wrench time is typically measured through work sampling studies, technician observations, time tracking or maintenance productivity assessments. The objective is not to monitor individuals, but to identify process inefficiencies that prevent maintenance teams from spending more time carrying out productive work.
Why Wrench Time Matters
Maintenance departments are constantly under pressure to improve performance whilst controlling costs.
One of the most effective ways to achieve this is by increasing the amount of productive work completed during each shift.
Consider a maintenance team of ten technicians.
If technicians spend only 25% of their working day carrying out productive maintenance activities, the equivalent productive output is approximately two and a half full-time technicians.
Increasing wrench time to 35% or 40% can create a substantial increase in maintenance capacity without recruiting additional personnel.
The result is:
More preventive maintenance completed
Reduced maintenance backlog
Faster response to equipment issues
Improved labour utilisation
Greater asset availability
Common Causes of Low Wrench Time
Low wrench time is rarely caused by technicians being unwilling to work. More often, it is a symptom of ineffective maintenance processes.
Poor Maintenance Planning
One of the biggest contributors to lost productivity is inadequate planning.
Technicians arrive at a job only to discover:
Spare parts are unavailable
Tools are missing
Access has not been arranged
Additional information is required
As a result, work stops before it has properly started.
Ineffective Scheduling
Without clear schedules, technicians may spend valuable time waiting for instructions or determining priorities.
A structured scheduling process helps ensure maintenance personnel always know what work should be completed next.
Spare Parts Issues
Maintenance stores can have a major impact on wrench time.
Poor inventory management often results in technicians searching for parts, waiting for deliveries or making multiple visits to complete a single task.
Excessive Travel and Site Logistics
Large facilities can create significant travel time between jobs.
Whilst some travel is unavoidable, poor work coordination can increase movement and reduce productive maintenance time.
Reactive Maintenance
Organisations that operate in a highly reactive environment often experience lower wrench time.
Breakdowns disrupt schedules, create urgent work and force technicians to switch between tasks, reducing overall efficiency.
The Link Between Planning and Wrench Time
One of the most effective ways to improve wrench time is through better maintenance planning.
When work is properly planned:
Spare parts are available before work begins.
Safety documentation is prepared.
Required tools are identified.
Labour requirements are understood.
Access arrangements are confirmed.
This allows technicians to spend more time performing maintenance and less time dealing with obstacles.
Many organisations discover that improving planning processes delivers some of the fastest and most sustainable gains in maintenance productivity.
Improving Wrench Time in Practice
Organisations looking to improve wrench time should focus on removing barriers that prevent technicians from carrying out productive work.
Practical improvement opportunities include:
Strengthen Maintenance Planning
Develop detailed job plans and ensure work is fully prepared before scheduling.
Improve Scheduling Discipline
Schedule work in advance and ensure technicians always have a clear understanding of priorities.
Optimise Spare Parts Management
Improve stores processes and ensure critical parts are available when needed.
Use CMMS Data Effectively
Maintenance management systems can help identify recurring delays, monitor productivity and improve future planning accuracy.
Reduce Reactive Work
Investing in preventive maintenance and reliability improvement initiatives can help reduce breakdowns and improve workforce utilisation.
The Reliability Connection
Wrench time is not simply a productivity measure. It also has a direct impact on asset reliability.
When technicians spend more time carrying out planned maintenance activities:
Preventive maintenance compliance improves.
Equipment condition is better understood.
Potential failures are identified earlier.
Maintenance backlog is reduced.
Asset performance becomes more predictable.
Over time, these improvements contribute to fewer failures, reduced downtime and greater operational stability.
Measuring Improvement
Organisations seeking to improve wrench time should monitor a range of supporting performance indicators, including:
Preventive Maintenance Schedule Compliance
Percentage of Planned Work
Maintenance Backlog
Schedule Compliance
Reactive Maintenance Levels
Labour Utilisation
Mean Time Between Failures (MTBF)
Tracking these metrics helps identify opportunities for improvement and measure the effectiveness of maintenance initiatives.
Increase Maintenance Productivity
Improving wrench time is one of the most effective ways to increase maintenance productivity without increasing labour costs.
By reducing delays, improving planning and scheduling processes, strengthening spare parts management and reducing reactive maintenance, organisations can significantly increase the amount of productive work completed by their maintenance teams.
The benefits extend far beyond productivity. Higher wrench time supports better maintenance execution, improved asset reliability and greater operational performance.
For organisations seeking to improve maintenance efficiency and reliability, understanding and improving wrench time is often an excellent place to start.
Could Your Maintenance Team Be More Productive?
If maintenance backlog is growing, reactive work is increasing or technicians are spending too much time waiting rather than maintaining equipment, there may be opportunities to improve maintenance performance.
Read: The Role of the Maintenance Planner
Explore: Maintenance Planning & Scheduling Training
Discover: The AMIS Journey Maintenance Assessment
These resources can help you identify inefficiencies, improve planning processes and increase maintenance productivity across your organisation.
