In brief
Most serious accidents on harvest machines happen while trying to clear a blocked header, feeder house or baler pick-up by hand while the machine is running. The Work Equipment Regulation requires maintenance and intervention to be carried out only when the machine is switched off, isolated and all movement has stopped; on site, this means a written shutdown sequence. Moving machines by road calls for a separate plan for the wide header, the unloading auger and power lines.
Combine harvester safety: where on the machine do accidents happen?
Harvest is the busiest and most exhausting period in farming. In Bursa's mainly agricultural districts such as Karacabey, Yenişehir and Mustafakemalpaşa, and on the plains of the surrounding provinces, combines work from morning to night throughout the grain harvest, followed by balers. Combine harvester safety largely depends on managing a single moment: what the operator does when the machine blocks. A hand movement made while clearing a blockage can cost the rest of the season and, often, a limb.
In a combine and a baler, the crop is drawn in by a flow that cannot be stopped. Knowing which part does what is the first step in recognising the danger zones:
| Section | Function | Main hazard |
|---|---|---|
| Cutting header (knife and fingers) | Cuts the stalks | Cuts, hand and foot injuries |
| Header auger and reel | Gathers the crop and moves it to the centre | Entanglement, being drawn in |
| Feeder house (conveyor) | Conveys the crop to the threshing unit | Entrapment between chain and slats |
| Threshing drum and concave | Separates grain from straw | Crushing, sudden rotation after a blockage |
| Grain tank auger and unloading auger | Unloads the grain | Entanglement in the auger when entering the tank |
| Straw chopper | Cuts and spreads the straw | Ejected parts, cuts |
| Baler pick-up and plunger | Picks up and compresses the straw | Being drawn in, crushing |
| PTO shaft (baler and trailed equipment) | Transmits power from the tractor | Clothing entanglement |
For details of the PTO shaft and the tractor itself, see our article on tractor overturns and PTO shaft accidents; this article focuses on entrapment risks specific to harvest machines.
Clearing blockages: the most common harvest machine accident scenario
Damp straw, lodged crop or fast travel blocks the header or the feeder house. The operator climbs down to pull out the blocked crop; the machine is idling and the belts are still tight. The moment the blockage clears, the tensioned belt and drum release, and the hand is drawn in with the crop. The sentence that comes up most often in accounts of harvest machine accidents is "it took a second", because the speed at which the machine draws in crop is faster than the human reflex to pull a hand back.
Annex I item 2.13 of the Regulation on Health and Safety Requirements for the Use of Work Equipment is clear: maintenance work may only be carried out when the work equipment is switched off, isolated from its energy supply, all its movement stopped and not running; where this is not possible, the necessary measures are taken or the work is done outside the danger zone. Clearing blockages falls within this scope. A workable shutdown sequence on site is as follows:
- Disengage the drives. Disengage the header and threshing unit drives; lower the header to the ground.
- Stop the engine and put the key in your pocket. If the key stays in the ignition, someone climbing into the cab could start the machine.
- Wait for movement to stop. The threshing drum, straw chopper and baler flywheel keep turning for a while after the engine stops. Listen and look; do not approach until everything has stopped completely.
- Release stored energy. Put the raised header on its safety support, release hydraulic pressure by the method described by the manufacturer, and watch out for belts and chains that remain tensioned.
- Clear it with a tool, not by hand. Clear the blockage with a long-handled hook or the tool supplied by the manufacturer. If the machine has a reverser function, use it first; this is done from the cab and nobody is in front of the machine.
- Close the guards, then start. Give an audible warning before starting and check that nobody is nearby.
The same logic applies to the grain tank. Entering the tank to push bridged grain with a foot or shovel during unloading puts the person directly on top of the auger at the bottom. Nobody enters the tank under any circumstances while the unloading auger is running; bridging is cleared from outside with a long-handled tool and with the auger stopped. This is why the grid on the tank cover is there, and it should not be removed.
Reducing the number of blockages is also a safety measure. Reducing travel speed according to crop moisture, not starting harvest before the morning dew has lifted, and keeping header and feeder house settings at the manufacturer's values reduces the number of times the operator climbs down from the machine, and thus the number of times they approach the danger zone.
Agricultural machine guards: a removed cover is lost safety
The chain, belt and gear drives of harvest machines are covered with guards. These guards are removed for maintenance and then not refitted because "the season is nearly over anyway". Annex I item 2.8 of the regulation requires that, where mechanical contact with moving parts could lead to an accident, equipment is fitted with guards preventing access to the danger zone; guards must be robust and not easily removed or defeated. Agricultural machine guard covers fall within this definition.
In the short check made before the season and every morning before starting work, look at the following:
- Are belt, chain and gear covers in place with all their screws?
- Is the PTO shaft guard untorn and secured with its chain?
- Is the safety support for the header lift cylinders on the machine?
- Are the ladder and platform guardrails sound; has mud and straw built up on the steps?
- Are the audible reversing alarm and the lights working?
- Is there a fire extinguisher in the cab, and is its last inspection date still valid?
For the general logic and types of guards, see our article on machine guards.
Balers: pick-up, knotter and flywheel
The baler collects the straw left in the field after the combine. Accidents concentrate at three points:
- Pick-up blockage: The pick-up tines push straw inwards. While trying to clear a blockage by hand, the hand is drawn towards the packer forks and the plunger.
- Knotter faults: Twine breaking or knots not being tied is common, and the operator climbs down often. The knotter and needles move while the PTO shaft is turning; adjustment and threading twine are done only after the PTO shaft has stopped and the flywheel has come to a complete stop.
- Flywheel inertia: The heavy flywheel keeps turning after the tractor's PTO is switched off. If there is a flywheel brake, it is used; if not, wait for it to stop.
Round balers also have the risk of crushing as the tailgate closes, and of an ejected bale rolling on sloping ground. If anyone is to go under the open tailgate, the tailgate safety lock specified by the manufacturer is fitted. With trailed balers, nobody goes between the tractor and the machine while hitching or while the PTO shaft is turning.
Combine harvester safety when moving by road
The risks of a harvest machine do not end in the field. When moving from field to field, a wide, slow and tall vehicle goes out onto narrow village roads and main roads. Points to watch at this stage are:
| Risk | Measure |
|---|---|
| Header width | The header is removed and towed on the manufacturer's transport trailer; if it cannot be removed, a knife guard is fitted |
| Unloading auger left out | The auger is folded and put in its transport lock; the machine goes on the road with the tank empty |
| Power lines and underpasses | The route is known in advance; points with height limits and overhead lines are noted |
| Visibility | Lights and warning beacons work; if possible an escort vehicle goes ahead, and travel after sunset is avoided |
| Extra people in the cab | Under Annex II item 2.4 of the regulation, people are not carried on equipment unless the manufacturer permits it; the helper comes in a separate vehicle |
| Brakes and steering lock | Road mode, brake coupling and mirrors are checked before setting off |
Helpers working near the machine on the road and in the field wearing high-visibility clothing, not approaching the machine without making eye contact with the operator, and using pre-agreed hand signals for communication all reduce accidents.
Training, fatigue and emergency preparedness
Annex II item 2.1 of the Work Equipment Regulation requires self-propelled work equipment to be used by employees who have received suitable training in its safe use. A harvest machine operator's training should cover not only driving but also the sequence for clearing blockages and shutting down, using a fire extinguisher and what to do in the event of an accident. Every grower employing workers during harvest is an employer under Law No. 6331; for the general organisation of seasonal work, see our article on OHS for seasonal agricultural workers.
Harvest days are long, and a significant share of accidents come from lapses in attention brought on by fatigue. Operator changeovers, breaks in the midday heat and additional lighting for night work should be part of the risk assessment. Straw dust and hot exhaust surfaces are the main causes of combine fires; cleaning the engine compartment at the end of the day and making sure the fire extinguisher in the cab is charged are simple but effective measures.
When an entrapment occurs, the machine is stopped first, the limb is not forcibly pulled out of the machine, and the location of the field is given clearly when calling 112. Our article on first aid for amputation and crush injuries guides you on the first response. For risk assessment, operator instructions and site checks on your farm, you can use our OHS specialist service, and see your obligations with the OHS obligations calculator.
Frequently Asked Questions
Can a blockage be cleared while the combine is idling?
No. Intervention without disengaging the drives and stopping the engine is the most common cause of entrapment accidents. The regulation requires maintenance and intervention to be done with the machine switched off, isolated and all movement stopped. If the machine has a reverser function, it is used first.
Can I intervene immediately after switching off the engine?
Not immediately. The threshing drum, straw chopper and baler flywheel keep turning for a while after the engine stops. Make sure all movement has ended, put the raised header on its safety support, then approach.
Can I refit a removed guard cover at the end of the season?
No. Working with a machine missing its guard directly increases the risk of entanglement and entrapment. The machine is not used until the guard is fitted; a lost or damaged cover is replaced before the season starts.
Can a helper ride in the combine cab?
Not unless the manufacturer's user manual explicitly permits it. The helper travels to the field and between fields in a separate vehicle.
A certified specialist matched to your hazard class: site inspections, approved logbook, training plan, annual plan and report follow-up.
Bursa SİSTEMER OSGB Technical Team — written from the field experience of our OHS specialists and workplace physicians. Legal information is valid as of the publication/update date; contact us for an assessment specific to your business.