A preventive maintenance (PM) programme is the most effective way to keep heavy equipment running, control repair costs and avoid unplanned downtime. Without one, organisations default to reactive maintenance where machines run until they break, and emergency repairs cost far more than the planned work they replace.
This guide is for fleet managers, maintenance supervisors and plant operators who need a practical framework for setting up or improving a PM programme. It covers the full cycle: equipment register, OEM intervals, checklists, scheduling, cost tracking and programme review.
Before you start
Gather the OEM service manual for every machine, a current maintenance schedule (even a spreadsheet), service tools and consumables, and an equipment maintenance log to record all work. Review your maintenance tracking system and pull together service records, parts receipts and breakdown reports from the last 12 months to identify gaps and cost drivers.
Step-by-step PM programme
1. Build the equipment register
List every machine with its make, model, serial number, year, current hours and location. Include major components (engines, transmissions, final drives) as sub-assets where they have independent service requirements. Use the heavy equipment maintenance checklist to ensure nothing is missed.
2. Map service intervals from OEM manuals
Extract recommended intervals from each OEM manual, typically at 250, 500, 1,000 and 2,000 hour milestones. Record which tasks fall at each interval. CAT, Komatsu and Volvo publish detailed interval tables. Use these as your baseline and adjust for site conditions.
3. Create maintenance checklists per interval
Build a checklist for each interval and machine type covering every task, parts, fluids, torque specs and safety precautions. The preventive maintenance checklist template provides a structure you can adapt to your fleet.
4. Schedule services by hours or calendar
Schedule by operating hours where meters exist, or calendar intervals where they do not. Apply the rule: whichever trigger comes first initiates the service. Enter all services with lead time for parts.
5. Perform the service and record findings
Execute per the checklist. Record all work, parts used, fluid volumes, readings and defects. Note machine hours at time of service. For hydraulic work, refer to our hydraulic system service guide.
6. Track costs and component life
Record every cost: parts, fluids, labour and third-party work. Track component life (hours on tracks, undercarriage, ground engaging tools) to forecast replacements and compare against industry benchmarks.
7. Review and adjust the programme
Review quarterly. Analyse breakdown frequency, unplanned downtime and repeat failures. Shorten intervals for components that fail early and extend those that consistently outlast the schedule.
Preventive vs reactive
Understanding the three strategies helps you allocate effort.
| Factor | Preventive | Reactive | Predictive |
|---|---|---|---|
| Cost | Low to moderate | High (flow-on costs) | Lowest when done well |
| Downtime | Planned, minimal | Unplanned, production stops | Planned, targeted |
| Planning | Scheduled in advance | None, emergency response | Condition-based |
| Skill level | Standard technician | Senior for diagnostics | Specialist with monitoring |
| When to use | All equipment, baseline | Non-critical, low-cost items | High-value critical assets |
Most fleets should run preventive maintenance as the baseline for all equipment, reserve reactive maintenance for low-cost consumable items (light globes, wiper blades), and layer predictive maintenance onto high-value assets where the cost of failure justifies the investment in monitoring technology such as oil analysis and vibration sensors.
Service intervals
OEM intervals follow a tiered structure. The table below shows typical tasks based on CAT, Komatsu and Volvo guidelines. Cross-reference with your machine's specific manual.
| Interval | Typical tasks | Notes |
|---|---|---|
| 250 hours | Engine oil and filter, fuel filter, air filter inspection, grease all points, fluid levels | Foundation service. See the greasing guide. |
| 500 hours | 250-hour tasks plus hydraulic oil sample, transmission filter, coolant test, belts and hoses, battery | Oil sampling catches contamination early |
| 1,000 hours | 500-hour tasks plus hydraulic filter, coolant filter, valve clearance, swing gear, undercarriage measurement | Plan a longer workshop slot with a technician |
| 2,000 hours | 1,000-hour tasks plus hydraulic oil change, coolant flush, turbo inspection, injector testing, full undercarriage | May require dealer involvement |
Harsh conditions (dust, heat above 40 degrees, heavy loading), which describe most Australian mine and civil sites, can require shortening intervals well inside the OEM figure. Use oil analysis results and your own failure history to decide by how much.
Cost-benefit analysis
Reactive work is consistently more expensive than the repair invoice suggests once every flow-on cost is counted, though the exact multiple varies by operation and asset. The drivers are consistent:
- Unplanned downtime: lost production while the machine sits idle, usually the largest single cost and the hardest to recover
- Reactive premium: after-hours labour rates and expedited freight on parts that would otherwise have been ordered on lead time
- Secondary damage: a small failure left unchecked cascades, for example a failing oil pump starving and seizing an engine
- Resale value: a complete, documented service history supports a stronger resale or trade-in price
- Compliance: documented PM records support warranty claims, insurance claims and WHS obligations
A preventive programme moves spend from unplanned to planned, lifts machine availability and stretches component life. The size of the saving depends on your fleet, duty cycle and labour rates, so rather than trusting a generic benchmark, track your own cost per operating hour before and after you tighten the programme. That number is what proves it is working and what justifies the next round of investment.
