What a preventive maintenance checklist is
A preventive maintenance checklist is the standard task list that a PM schedule carries — the fixed set of inspections, cleaning, lubrication, tightening and measurements a technician works through every time a machine falls due. It is not a loose reminder; it is a structured checklist template attached to the schedule, the same template-and-checksheet pattern the wider suite uses for audit and quality checks. When the schedule triggers, Fast Maintenance generates a PM ticket and the checklist is executed against that ticket, item by item.
Why it matters is simple: a schedule tells you when to service a machine, but the checklist decides what actually gets done and whether it was done well. Without a defined task list, "monthly PM" means whatever the technician on shift remembers to look at. With one, every visit covers the same points, records the same readings, and leaves a history you can trust for an audit, an AMC claim or a reliability review. The checklist is where a preventive programme stops being a calendar and becomes real, measurable work.
Anatomy of a good checklist task
A weak checklist reads "check the motor". A strong one tells the technician exactly what to inspect, how to inspect it, what "good" looks like, and how to record the answer. Every task on a well-built PM checklist carries four parts:
| Part of the task | What it defines | Weak example → Strong example |
|---|---|---|
| Task / what | The specific item or component to act on | "Check motor" → "Inspect drive-motor mounting bolts" |
| Method / how | The action and the tool or sense used | "Look at it" → "Torque-check with wrench; feel for vibration" |
| Standard / accept criteria | The condition or limit that counts as OK | "Should be fine" → "Bolts at 45 Nm; no visible movement" |
| Response type | How the result is recorded | Tick only → OK / Not-OK / Value |
The technician then records the result against the auto-generated PM ticket, and alongside the item-level responses the job also captures labour time and spares used, so the cost and effort of preventive work are visible, not just the fact that it happened. A preventive maintenance module that captures all four parts turns a checklist from a compliance tick-sheet into a data source.
The three response types: OK / not-OK / measured value
The single most important design choice on a PM checklist is the response type of each item. Fast Maintenance supports three, and choosing the right one per task is what makes the data worth collecting.
OK
The item met its standard — the guard is fitted, the belt is intact, the area is clean. A pass with nothing more to record.
Pass / failNot-OK
The item failed its standard. This is the trigger that can spawn a corrective ticket, so the fault is captured and routed to repair, not just noted.
Spawns ticketMeasured value
The technician records an actual reading — pressure, temperature, run-out, current, concentration — against an accept range.
TrendableWhere the discipline pays off is the measured value. A tick tells you the bearing temperature was "OK" on the day; a recorded 68 °C tells you it was 52 °C last month and 61 °C the month before — a trend heading for trouble long before anyone would have ticked "not-OK". A value can be plotted; a tick cannot. For readings that drift — vibration, insulation resistance, oil pressure, coolant concentration — always capture the number, so the checklist feeds condition monitoring and the reliability dashboards rather than just confirming a box was looked at.
The closed loop: how a not-OK item spawns a corrective ticket
A checklist that only records problems is half a system. The point of inspection is repair, and Fast Maintenance closes that gap automatically: when an item is marked not-OK, it can spawn a corrective breakdown ticket against the same asset, carrying the finding straight into the repair workflow. Here is the loop, end to end:
This is what stops preventive maintenance from becoming a paperwork exercise. Without the loop, a fault spotted during PM lives on a sheet in a folder until it becomes a breakdown; with it, the inspection that found the problem is the same action that starts the fix. Read the companion guide on preventive vs breakdown maintenance for how the two work types balance.
Best practices for PM checklists
Good checklists share a handful of habits. Whether you are writing your first PM template or cleaning up a hundred, these are the rules that decide whether technicians actually engage with the list or rubber-stamp it.
- Be specific and measurable. "Check hydraulic pressure — accept 120–140 bar" beats "check hydraulics". A task you can pass or fail objectively removes judgement calls and makes the record defensible.
- Match depth to criticality. A critical CNC or DG set deserves a long checklist with measured values; a low-risk asset needs a short OK/not-OK list. Do not spend the same effort on everything.
- Attach a safety work permit. For lockout, hot work or work at height, the permit belongs on the job — Fast Maintenance attaches work permits and photo capture to the PM ticket so safety is part of the record, not a separate form.
- Get the length right. Size the list to the time available in the maintenance window. A 60-item monthly list that realistically takes two hours in a 40-minute slot guarantees skipped items and false ticks.
- Capture photos for condition. A photo of a worn belt or an oil leak is worth more than a remark, and it travels with the corrective ticket if the item is not-OK.
- Never write "check everything". A catch-all line is unmeasurable and unauditable. If it matters, make it its own task with a standard; if it does not, leave it off.
Ready-to-use checklist templates
Below are starter PM checklists for the assets most plants and facilities run. Treat them as a base — adjust the accept criteria to your make, model and OEM manual, then load them onto a schedule in Fast Maintenance so they reappear on every PM ticket that schedule generates.
CNC machine — monthly PM checklist
| Task | Method | Accept criteria | Response |
|---|---|---|---|
| Clean guideways & covers | Wipe, visual | No swarf, no scoring | OK / Not-OK |
| Way-lube level | Sight glass | Between MIN and MAX | OK / Not-OK |
| Spindle run-out at nose | Dial indicator | ≤ 0.015 mm | Value (mm) |
| Coolant concentration | Refractometer | 6–8% | Value (%) |
| Axis backlash check | Test program | Within OEM limit | Value (mm) |
| Door interlock & E-stop | Function test | Stops all motion | OK / Not-OK |
Air compressor — monthly PM checklist
| Task | Method | Accept criteria | Response |
|---|---|---|---|
| Air filter condition | Visual / indicator | Not choked; clean or replace | OK / Not-OK |
| Oil level & colour | Sight glass | At mark; not dark/emulsified | OK / Not-OK |
| Discharge pressure | Gauge | Within rated band | Value (bar) |
| Discharge air temperature | Panel / probe | ≤ OEM limit | Value (°C) |
| Auto drain / condensate trap | Function test | Drains, no leak | OK / Not-OK |
| Belt tension / coupling | Inspect | No cracks, correct tension | OK / Not-OK |
DG set — monthly PM checklist
| Task | Method | Accept criteria | Response |
|---|---|---|---|
| Engine oil level & pressure | Dipstick / gauge | At mark; pressure in band | Value (bar) |
| Coolant level & leaks | Visual | At mark; no leak | OK / Not-OK |
| Battery voltage & terminals | Multimeter | ≥ 12.4 V; clean, tight | Value (V) |
| Fuel level & filter | Gauge / visual | Adequate; no water | OK / Not-OK |
| On-load test run | Run 15 min | Stable frequency & voltage | Value (Hz/V) |
| Exhaust & silencer | Visual | No excessive smoke / leak | OK / Not-OK |
General electrical & mechanical — checklist
| Task | Method | Accept criteria | Response |
|---|---|---|---|
| Panel & terminal tightness | Thermal / torque | No hotspot; bolts tight | OK / Not-OK |
| Motor current draw | Clamp meter | ≤ nameplate FLA | Value (A) |
| Bearing temperature | IR thermometer | Within OEM limit | Value (°C) |
| Vibration / abnormal noise | Feel / listen | No abnormal vibration | OK / Not-OK |
| Earthing & guards | Visual | Bonded; guards fitted | OK / Not-OK |
Note how the response column mixes OK/not-OK for pass-fail items and a measured value wherever a number can trend. Building your templates on a clean asset register means each checklist is tied to the exact machine it belongs to.
Frequency tiers — daily to quarterly
Not every task belongs on every visit. Split the checklist by frequency so quick daily checks stay quick and deep work happens only when it is due. A typical tiering looks like this:
| Tier | Scope | Typical tasks | Time budget |
|---|---|---|---|
| Daily / shift | Operator-level safety & cleanliness | Leaks, guards, oil level, abnormal noise, area clean | 5–10 min |
| Weekly | Quick technician checks | Filter condition, belt tension, coolant top-up, drain traps | 15–30 min |
| Monthly | Measured values & wear items | Pressure/temperature readings, run-out, current draw, lubrication | 1–2 hr |
| Quarterly / annual | Deep service & calibration | Oil change, alignment, insulation test, load test, overhaul checks | Half day+ |
Set each tier as its own schedule so Fast Maintenance generates the right ticket with the right checklist at the right cadence. The step-by-step method is covered in how to create a preventive maintenance schedule.
Common mistakes to avoid
Most failing PM programmes fail at the checklist, not the calendar. Four mistakes account for the majority:
- Vague tasks. "Inspect pump" gives no standard, so two technicians reach two conclusions and neither can be audited. Give every task an accept criterion.
- Tick-only, no values. Ticking "OK" on a reading that should be a number throws away the trend that would have warned you. Capture the value wherever one exists.
- Too long for the window. A checklist that cannot be finished in the available time is a checklist that gets false-ticked. Right-size or split by frequency.
- No owner or no loop. A not-OK item with nowhere to go dies on the sheet. Make sure failed items spawn a corrective ticket with an assignee.
Want your CNC, compressor and DG checklists live in the software?
We can load your PM checklist templates onto real schedules, show a not-OK item spawning a corrective ticket, and capture values, work permits and photos — in a 30-minute demo on your own assets.
How Fast Maintenance implements it
Fast Maintenance Software — built by Improsys in Pune on the shared Fast Suite platform, cloud or on-premise — turns every point above into working software. Mapping the checklist to the product:
Frequently asked questions
What is a preventive maintenance checklist?
A preventive maintenance checklist is the standard task list carried by a PM schedule — the fixed set of inspections, cleaning, lubrication and measurements a technician performs each time a machine falls due. In Fast Maintenance it is a checklist template attached to the schedule and executed against the auto-generated PM ticket, with every item recorded as OK, not-OK or a measured value.
What should a PM checklist include?
A good PM checklist gives each task four things: what to do, the method or how, the acceptance standard, and a response type — OK, not-OK or a measured value. It should also capture labour time, spares used, a safety work permit where the job needs one, and photos, so the record proves the work and any reading that drifts out of limits is visible.
What happens when a checklist item fails (not-OK)?
When a technician marks an item not-OK, Fast Maintenance can automatically spawn a corrective breakdown ticket linked to the same asset — closing the loop from inspection to repair. The failed reading, photo and remark carry across, the job is assigned and the spare issued, so a fault found during preventive work is never lost between the checklist and the fix.
How detailed should a PM checklist be?
Match the depth to the asset's criticality. A critical CNC or DG set earns a longer checklist with measured values; a low-risk asset needs only a short OK/not-OK list. Keep every task specific and measurable, size the list to the time available at each frequency, and resist a vague 'check everything' line — it is the fastest way to get tick-only compliance.
Do you have PM checklist templates for CNC, compressor and DG set?
Yes. This guide includes ready-to-use PM checklist templates for a CNC machine, an air compressor, a DG set and general electrical and mechanical work, each laid out as task, method, acceptance criteria and response type. In Fast Maintenance you load a template onto a schedule once and it is reused on every PM ticket that schedule generates, cloud or on-premise.
