Research conducted by the Kondinin Group and the Grains Research and Development Corporation (GRDC) indicates that, on average, 7% of combine harvesters operating in Australian paddocks start a fire every year.
The most common causes are chaff and dust accumulation on hot engine components, and bearing failure. A pre-engineered and certified automatic fire suppression system installed before harvest season is the most reliable protection for the operator, the machine, and the surrounding crop. For mobile farm machinery in Australia, the applicable standard is AS5062:2022 (Fire Protection of Mobile and Transportable Equipment).
Why Combine Harvesters Carry Australia’s Highest Agricultural Fire Risk
Combine harvesters present a fire risk unlike that of most other machinery, because they operate at maximum load in the hottest conditions of the year, in an environment that continuously generates dry, combustible material, and in locations where fire services may be an hour or more away.
The Country Fire Authority of Victoria identifies the most common cause of harvester fires as material collecting on hot engine components, specifically the manifold, exhaust, and turbocharger.
Source: cfa.vic.gov.au, last updated August 2025
Long-term research conducted by the Kondinin Group and supported by the Grains Research and Development Corporation (GRDC) highlights the scale of this threat:
- On average, 7% of combine harvesters operating in Australia start a fire in any given harvest season.
- Approximately 10% of those fires result in significant machinery loss or widespread crop damage.
- The two main ignition drivers are dust and chaff build-up on hot engine surfaces and mechanical bearing failures.
Data from the NSW Rural Fire Service (NSW RFS) reinforces this risk profile, with state fire crews responding to dozens of agricultural machinery fires each harvest season involving harvesters, tractors, and balers.
Harvest season concentrates every risk factor simultaneously. Machine operating hours peak alongside ambient temperatures, while crop moisture drops to its lowest levels. The risk profile of a combine during a summer harvest in the Riverina or the WA Wheatbelt is fundamentally different from the same machine parked during the off-season.
The timing of fire escalation on a harvester is also distinct from other equipment classes. By the time an operator visually detects an engine bay fire through cab smoke or mirrors, the fire has typically progressed past the capability of a portable handheld extinguisher. Automatic detection and suppression activate at the first sign of heat or thermal activity, suppressing the threat before it reaches that catastrophic threshold.
For a comprehensive overview of fire protection across all farming and agricultural machinery applications, Musterfire’s agricultural fire protection covers the full range of machine types and system configurations.
Fire Risk Across All Farm Machinery and Not Just Harvesters
While combine harvesters carry the highest concentration of fire risk, every major class of farm machinery presents distinct ignition hazards during the working season.
- Tractors
Tractors operate across the full farming calendar: cultivation, seeding, spraying, and baling. Engine bay fires on tractors typically originate from hydraulic fluid leaks onto hot turbocharger and exhaust components, or from dust and chaff accumulation in confined engine compartments during field work. Long operating hours during seeding and tillage seasons create sustained heat load on all engine components. A tractor fire suppression system provides continuous protection across every season.
- Headers and windrowers
These present a similar risk profile to combine harvesters but with different machine geometry and seasonal exposure. Canola windrowing is particularly high-risk: canola residue is oil-rich, and the dry conditions that accompany harvest create a rapid escalation pathway from a contained engine-bay fire to a field fire.
- Hay balers
These combine high-friction mechanical systems with continuous processing of dry combustible material. The bale chamber generates significant heat during operation, and fires can propagate from the baler to accumulated bales in the paddock before the operator is aware of the ignition. Fire suppression for hay balers must protect both the bale chamber and the engine bay.
- Slashers and mulchers
Slashers and mulchers generate combustible cut material that can accumulate around the engine compartment during operation. Access for fire services in paddock environments is limited, and the operator is often remote from any water supply.
The same principle applies to each of these machines: by the time a fire is visible, a manual response is unlikely to prevent significant equipment loss. Detecting heat at the source and discharging agent directly onto the hazard zone is the only reliable defence.
How an Automatic Fire Suppression System Works on a Harvester
Understanding the detection-to-suppression sequence is important for operators and farm managers evaluating systems. The sequence is the same whether the machine is a combine harvester, a tractor, or a hay baler. The detection zones and agent volumes are scaled to the machine.
Detection
MusterWire linear heat detection wire is routed through the designated risk zones of the machine, typically the engine bay, exhaust manifold proximity, and hydraulic compartment. The wire responds to temperature at the point of contact, not to smoke or particles in the surrounding air.
This matters in a harvester environment where ambient dust, chaff, and fine crop particles are continuously present during operation. Optical smoke detection would trigger false alarms or fail to detect early heat events in this environment. Linear heat detection wire is unaffected by ambient particulates; it detects only when the wire’s temperature reaches the activation threshold.
Activation
When the wire activates, the fire suppression control panel enters FIRE mode. Muster360 is the cloud-based documentation and design platform. An audible alarm sounds in the cab, a visual indicator activates, and a machine shutdown signal is triggered. A configured shutdown and suppression sequence is initiated in accordance with the approved system design.
Suppression
Agent discharges through pre-positioned stainless steel nozzles directly onto the identified hazard zones.
For farm machinery, a foam-based fire suppression system is the standard configuration. The foam smothers the fire by separating fuel from oxygen, suppresses flammable vapours to prevent re-ignition, and cools hot surfaces.
Musterfire’s foam formulations are fluorine-free (F3), a significant consideration in farm environments, as F3 foam leaves no PFAS residue that could contaminate soil, irrigation water, or livestock drinking supplies after discharge.
Documentation
The Muster360 panel records detection time, activation time, discharge duration, and system status for post-incident reporting and insurance documentation.
This sequence is demonstrated in Musterfire’s case study of the CASE IH 7250 Combine Harvester (Forbes, NSW), fitted with a 110L Muster LHD system using MusterWire linear heat detection throughout the risk areas. The system was installed through O’Connors, Australia’s largest Case IH dealership.
A second case study, a John Deere S7 800 Combine Harvester operating in Zambia on sunflower harvesting, demonstrates the same system approach in a different crop type and international operating environment. The dry conditions and oil-rich residue from sunflower harvesting create a risk profile comparable to that of pulse cropping in Australia.
For compact farm machines where compartment geometry limits foam system installation, Musterfire’s misting fire suppression system provides an alternative that uses a fine water-foam mist to cool and suppress fire within the protected.
What AS5062:2022 Requires for Agricultural Mobile Plant
Australian Standard AS5062:2022 (Fire Protection of Mobile and Transportable Equipment) is the current benchmark for fire suppression systems on mobile plant in Australia.
The standard applies to agricultural mobile plant, including combine harvesters, tractors, headers, and balers, under the same framework as mining haul trucks and waste management equipment. The machine’s industry does not determine the applicable standard; the machine type does.
- AS5062:2022 sets requirements across the full system lifecycle. System design, detection method and configuration, agent type and volume, nozzle placement and coverage, commissioning procedure, inspection intervals, and the maintenance documentation that must accompany each fitted machine.
- AS5062:2022 superseded AS5062:2016. Operators who had systems installed against the previous version should verify that their installations have been assessed against the current standard. The 2022 version updated performance requirements and documentation obligations, and compliance documentation referencing the superseded standard may not satisfy current insurer requirements.
The insurance consequence is direct. A growing number of farm insurers require documented evidence of a certified fire suppression system and ongoing maintenance as a condition of coverage for high-value agricultural equipment.
Musterfire’s own case study of the CASE IH 7250 installation notes a potential reduction of insurance premiums as an outcome for the operator.
Refer to Musterfire certification documentation for the applicable certification scope and system configuration.
Systems must be commissioned by an authorised installer for the AS5062:2022 compliance position to hold. This also means that systems should be installed and commissioned before harvest season. Commissioning during the harvest period leaves the machine operating unprotected at the point of maximum risk.
System Configuration by Machine Type
The appropriate fire suppression system for farm machinery depends on the machine type, the primary hazard zone, compartment geometry, and site-specific requirements. The following provides a baseline reference by equipment class.
| Machine Type | Primary Hazard Zone | Recommended System | Notes |
|---|---|---|---|
| Combine harvesters | Engine bay, exhaust manifold, hydraulic compartment | Foam-Based LHD (MusterWire detection) | 110L+ cylinder configuration for large machine coverage |
| Tractors (100hp+) | Engine bay, hydraulic circuit | Foam-Based LOP or LHD | System size scaled to compartment volume |
| Headers and windrowers | Engine bay, crop intake zone | Foam-Based LHD | Higher risk during canola and pulse harvest |
| Hay balers | Bale chamber and engine bay | Foam-Based LHD | Specific detection zone configuration required for bale chamber |
- Foam-based systems are the standard specification for farm machinery because the primary fire class is Class B: hydrocarbon fuels including diesel, hydraulic oil, and lubricants.
- Foam suppresses vapour and cools the surface, providing the cooling action that prevents re-ignition after the initial discharge.
- Fluorine-free (F3) foam formulations are available and the appropriate choice for agricultural environments where contact with soil, water, and livestock is possible.
System configuration for each machine must be confirmed through a site-specific risk assessment by an authorised installer. The hazard zone geometry of a combine harvester is different from that of a tractor or a hay baler, and the agent volume and nozzle configuration must reflect the specific machine.
A general table provides a reference framework, and it does not replace a risk assessment.
For an overview of the full range of Musterfire system types and the industries served, Musterfire’s industries page covers applications across agriculture, mining, construction, waste management, and other sectors.
Frequently Asked Questions
The Country Fire Authority of Victoria identifies the most common cause as material collecting on hot engine components, specifically the manifold, exhaust, and turbocharger. (Source: cfa.vic.gov.au, August 2025)
A foam-based system with MusterWire linear heat detection is the standard configuration for large combine harvesters. Foam addresses the primary Class B hazard (diesel fuel, hydraulic oil), provides cooling to prevent re-ignition, and fluorine-free formulations are available for environmental compatibility with farmland. Agent volume, cylinder placement, and nozzle configuration must be determined through a site-specific risk assessment by an authorised installer.
Musterfire’s case study of the CASE IH 7250 installation records noted a premium reduction for that specific operator; premium discounts are strictly at the underwriter’s discretion and are not guaranteed across the market.
Before harvest season. Systems must be installed and commissioned by an authorised installer before the machine enters service for the harvest period. Commissioning during harvest leaves the machine unprotected during the window of maximum fire risk.
Yes. Musterfire operates through an authorised distributor network with installations in mining, agricultural, and construction operations worldwide. The John Deere S7 800 case study documents the installation of a harvester in Zambia for sunflower harvesting operations. System configurations are adapted to local operating conditions and applicable standards in each country.
Specifying the Right System for Your Fleet
The fire risk profile of a combine harvester, tractor, or hay baler during an Australian harvest season is established and quantified. The ignition mechanisms are known, and the consequences of an unprotected machine fire (e.g. equipment loss, crop fire spread, operator egress under pressure, and insurance exposure) are well documented.
An automatic fire suppression system, pre-engineered to AS5062:2022 and installed by an authorised Musterfire distributor before the season begins, addresses all of these risks in a single, certified installation.
Learn more about Musterfire’s full range of farm machinery fire protection for agricultural applications. To locate an authorised installer in your region, including Australia, New Zealand, South Africa, and other global markets, use the distributor locator.