Preventive Maintenance

What is Preventive Maintenance?

Preventive maintenance (PM) is the practice of servicing equipment on a regular schedule — before it breaks, not after. It's the maintenance equivalent of changing your car's oil every 5,000 miles instead of waiting for the engine to seize.

The idea is simple: small, planned interventions prevent big, unplanned disasters. Replace the belt before it snaps. Clean the filter before it clogs. Tighten the bolt before it shakes loose and damages something expensive.

Most organizations know they should do preventive maintenance. Far fewer actually do it consistently. And the gap between "should" and "do" is where a lot of money gets wasted.

Why Preventive Maintenance Exists

Imagine you own a fleet of delivery trucks. You have two options:

Option A: Reactive (fix it when it breaks). A truck breaks down mid-delivery. The driver is stranded. The customer doesn't get their package. A tow truck costs $350. The emergency repair costs $2,800 (rush parts, after-hours labor). A rental truck for the next two days costs $400. Total: $3,550 plus an unhappy customer and a stressed-out driver.

Option B: Preventive (service it on schedule). Every 10,000 miles, the truck gets inspected. A technician notices the brake pads are wearing thin and the transmission fluid is dark. Parts and labor: $450. The truck is out of service for 4 hours during a planned maintenance window — not during a delivery. Total: $450 and no disruptions.

This isn't hypothetical. Organizations that implement preventive maintenance programs typically reduce breakdown-related costs by 25–50%. The math isn't even close.

How Preventive Maintenance Works

Schedule Types

Preventive maintenance triggers can be based on:

• Time-based — Every 30 days, quarterly, semi-annually. "Service the HVAC system every March and September."
• Usage-based — Every 500 hours of operation, every 10,000 miles, every 1,000 cycles. "Change the CNC machine's coolant every 500 operating hours."
• Calendar-based — Tied to specific dates, often aligned with regulatory requirements. "Fire extinguisher inspection every January."

The best programs use a combination: "Service every 6 months OR every 5,000 hours, whichever comes first."

Common PM Tasks

What actually gets done during preventive maintenance varies by equipment type, but typically includes:

Preventive vs. Reactive: The Numbers

The cost difference between planned and unplanned maintenance is stark:

One study found that reactive maintenance costs, on average, 3–5 times more than the same repair done preventively. The difference comes from rush shipping on parts, overtime labor, the cascading damage caused by running equipment to failure, and the production losses from unplanned downtime.

Building a Preventive Maintenance Program

Step 1: Inventory Your Assets

You can't maintain what you don't know about. Start with a complete list of all equipment that needs maintenance. For each asset, record:

• Make, model, serial number
• Location and responsible department
• Manufacturer's recommended maintenance schedule
• Current condition
• Criticality level (how badly does it hurt if this breaks?)

Step 2: Prioritize

Not everything needs the same level of attention. Prioritize using a simple framework:

• Critical assets (production lines, servers, safety systems) → Strict PM schedule, no exceptions
• Important assets (vehicles, HVAC, office printers) → Regular PM schedule
• Low-priority assets (break room appliances, desk accessories) → Reactive maintenance is fine

Step 3: Create Maintenance Schedules

For each critical and important asset, define:

• What maintenance tasks are needed
• How often (based on manufacturer recommendations, industry standards, and your own experience)
• Who performs the work (in-house technician, external vendor, assigned employee)
• Estimated duration and parts needed
• What to document after completion

Step 4: Track and Measure

A PM program without tracking is just good intentions. For every maintenance event, record:

• Date performed
• Tasks completed
• Parts used
• Condition notes
• Time spent
• Who did the work

This history is gold. Over time, it tells you which assets are becoming maintenance sinks, which schedules need adjusting, and when it's time to replace rather than repair.

Real-World Example

A property management company oversaw 14 commercial buildings with a total of 42 HVAC units, 28 elevators, and hundreds of other systems. Their maintenance approach was almost entirely reactive — fix it when a tenant complains.

The annual cost of this approach:

• $340,000 in emergency HVAC repairs (compressor failures, refrigerant leaks, electrical issues)
• $180,000 in elevator emergency service calls
• 23 tenant complaints per month related to climate control, on average
• One lawsuit from a stuck elevator incident

After implementing preventive maintenance:

• Quarterly HVAC servicing: filter changes, coil cleaning, refrigerant checks, belt inspections
• Monthly elevator inspections with annual full servicing
• Total PM program cost: $165,000/year

First year results:

• Emergency HVAC repairs dropped to $87,000 (74% reduction)
• Elevator emergency calls dropped from 34/year to 6/year
• Tenant complaints related to climate dropped to 5/month (78% reduction)
• Net savings: approximately $268,000/year after the cost of the PM program
• Equipment lifespan extended by an estimated 3–5 years across the portfolio

Common Mistakes

1. Creating a schedule but not following it. The PM plan looks great on paper, but when things get busy, maintenance gets pushed back. "We'll do it next month" becomes "we'll do it next quarter" becomes a breakdown.
2. Over-maintaining. Servicing equipment too frequently wastes money and time. If the manufacturer says every 1,000 hours, doing it every 500 hours isn't being careful — it's being wasteful. (Unless your operating conditions are unusually harsh.)
3. Not adjusting schedules based on data. Your initial PM schedule is a starting point, not gospel. If an asset has been serviced quarterly for two years and never shows signs of wear, maybe semi-annual is fine. If it's showing wear at every quarterly check, maybe monthly is needed.
4. Skipping documentation. A maintenance event that isn't recorded might as well not have happened. The whole point of PM is building a history that informs future decisions.
5. Ignoring technician feedback. The person doing the maintenance often notices things that aren't on the checklist. "That bearing sounds a little rough" or "there's some corrosion on the housing." Capture these observations — they're early warnings.

Preventive Maintenance with UNIO24

UNIO24 makes preventive maintenance manageable. Set up recurring maintenance schedules for any asset, assign tasks to team members, receive automated reminders before service is due, and maintain a complete maintenance log for every piece of equipment. Track maintenance costs per asset over time to identify when equipment is becoming more expensive to maintain than to replace. Never miss a scheduled service — and always have the data to prove it was done.

FAQ

How do I determine the right maintenance frequency?

Start with the manufacturer's recommendations — they know their equipment best. Then adjust based on your reality: operating conditions (a machine in a dusty factory needs more frequent cleaning than one in a clean room), usage intensity (24/7 operation vs. occasional use), and historical data (if you consistently find nothing wrong at quarterly checks, you might extend to semi-annual).

What's the difference between preventive and predictive maintenance?

Preventive maintenance follows a fixed schedule — service every X days or Y hours regardless of condition. Predictive maintenance uses data to determine when service is actually needed. Preventive is simpler to implement and works well for most organizations. Predictive is more optimized (fewer unnecessary maintenance events) but requires data infrastructure. Many organizations start with preventive and evolve toward predictive for their most critical assets.

How much should I budget for preventive maintenance?

A common benchmark is 2–5% of the asset's replacement value per year. So a $100,000 piece of equipment might cost $2,000–$5,000/year to maintain preventively. This will vary by asset type, age, and operating conditions. The key insight: this cost is almost always lower than the alternative (reactive maintenance and unplanned downtime).

Can preventive maintenance be overdone?

Absolutely. Over-maintenance wastes money and can actually damage equipment (every time you open a machine for service, you risk introducing new problems). The goal is the right amount of maintenance — not the maximum amount. Track your maintenance data and adjust schedules based on what you actually find during each service.

How do I get buy-in from management for a PM program?

Speak their language: money. Calculate your current reactive maintenance costs (emergency repairs, overtime, downtime losses, expedited parts). Show what a PM program would cost. The gap is your projected savings. In most cases, PM programs pay for themselves within 6–12 months. A single prevented breakdown often covers the entire annual PM budget.