The rice combine harvester machine is an essential piece of rice harvesting equipment for summer and autumn rice harvesting, integrating cutting, feeding, threshing, cleaning, and grain storage in one machine. As professional rice harvester machinery, it delivers high efficiency in paddy fields, while many users also pay attention to rice harvester price and price of rice combine harvester before purchase. Due to complex field conditions, continuous high-load operation, and irregular daily operation and maintenance, combine harvester machine rice models are prone to various mechanical failures. Unexpected breakdowns not only delay harvesting schedules and cause grain loss but also lead to severe component wear and increased maintenance costs. Based on practical field experience, this guide systematically analyzes common failures of rice combine harvester machine across five core systems: header system, feeding system, threshing and cleaning system, engine and electrical system, as well as hydraulic and traveling system. It provides detailed failure causes, on-site troubleshooting solutions, and professional maintenance tips, serving as a practical reference for farmers, large-scale growers, and agricultural machinery maintenance technicians.

1. Header System Failures: Most Frequent Front-End Problems

As the front working component of a rice harvester machine, the header directly contacts rice stalks, soil, and weeds during operation. Long-term friction and extrusion from field debris frequently cause blockages, uneven cutting, and grain dropping issues, severely affecting harvesting efficiency and operation quality.

1.1 Cutter Blockage and Header Straw Jam

Failure Symptoms: Crops cannot be cut and delivered smoothly. A large amount of straw accumulates on the header, causing abnormal operating noise and sudden load increase. In severe cases, the rice combine harvester machine will stall abruptly.

Failure Causes: Excessive weeds, wet rice stalks, or over-dense crops lead to overfeeding beyond the machine’s bearing capacity; excessively low cutting height causes the cutter to scrape the ground and wind up soil and grassroots; excessive or uneven gaps between moving and fixed blades, worn or deformed blades, and loose fixing bolts; hard foreign objects such as stones, iron wires, and sticks trapped in the cutter teeth.

Solutions: Stop and turn off the machine completely, engage safety locks, and thoroughly clean accumulated straw and trapped hard debris; calibrate the blade gap to the standard range of 0.3-1mm, straighten deformed cutter bars, and replace chipped, severely worn blades and damaged guards; adjust the cutting height according to field conditions, reduce driving speed in wet and weedy fields, and avoid overfeeding crops at one time.

1.2 Uneven Cutting Height and Uncut Rice Panicles

Failure Symptoms: A large number of unharvested rice panicles and broken straws remain in the field with uneven cutting surfaces, resulting in obvious grain loss.

Failure Causes: Long-term blade operation leads to blunt cutting edges and reduced cutting performance; unlevel and misaligned header with inappropriate height adjustment; excessive traveling speed that fails to match the crop feeding rhythm.

Solutions: Polish dull cutting blades and replace severely worn blade sets; calibrate header levelness before operation and set a reasonable cutting height based on rice plant height and growth status; reduce traveling speed according to crop density to ensure thorough cutting of all rice plants.

1.3 Excessive Grain Loss Caused by Reel Impact

Failure Symptoms: The reel repeatedly strikes rice panicles during harvesting, causing massive grain shedding and significant yield loss.

Failure Causes: Excessively high reel speed and forward installation position cause direct impact on rice panicles; improper reel height leads to continuous hitting of the upper panicle parts; over-mature and dry rice stalks are fragile and prone to grain shedding under mechanical impact.

Solutions: Reduce reel speed according to crop maturity, raise and slightly move the reel backward to minimize direct impact on panicles; adopt low-speed harvesting for fully mature and dry rice fields to reduce mechanical grain loss to the greatest extent.

2. Feeding System Failures: Blockage, Slippage and Uneven Conveying

The feeding trough and auger connect the header and threshing drum of the rice harvester machinery, responsible for stably conveying cut crops to the threshing system. Most feeding failures stem from improper operation, debris accumulation, and component wear, with typical problems including blockage, slippage, and uneven feeding.

2.1 Feeding Trough Blockage and Poor Material Conveying

Failure Symptoms: Crops pile up at the feeding trough inlet and cannot enter the threshing drum smoothly, causing intensified body vibration and continuous load increase.

Failure Causes: Loose feeding belts cause deviation and slippage; residual straw and soil accumulate in the feeding trough without timely cleaning; high-moisture wet stalks clump together and block the channel; excessive harvesting speed leads to overfeeding beyond the system capacity.

Solutions: Shut down the machine completely and clean all blocked debris and silt inside the feeding trough; adjust belt tension and correct deviation to ensure stable and uniform belt operation; reduce harvesting speed and single feeding volume in wet fields; clean the feeding trough before and after each operation to prevent debris accumulation and blockage.

2.2 Auger Slippage and Uneven Feeding

Failure Symptoms: Crop conveying speed is unstable with intermittent feeding, leading to reduced overall harvesting stability of the combine harvester machine rice.

Failure Causes: Worn and elongated auger drive chains cause insufficient power transmission; deformed and worn auger blades reduce material grabbing capacity; aging and loose drive belts fail to provide sufficient friction.

Solutions: Tighten loose auger drive chains and replace severely worn chains and sprockets; repair slightly deformed auger blades and replace irreparably worn ones; adjust drive belt tightness and replace aging, damaged belts to ensure stable feeding power output.

3. Threshing and Cleaning System Failures: Key Issues Affecting Grain Quality

Threshing and cleaning are the core working procedures of rice harvesting equipment, directly determining the cleanliness and integrity of harvested rice grains. Common problems such as incomplete threshing, high impurity content, broken rice, and drum blockage seriously affect grain quality and cause food waste.

3.1 Incomplete Threshing with Grains Remaining on Panicles

Failure Symptoms: A large number of grains remain on the discharged straws, resulting in high harvesting loss.

Failure Causes: The engine fails to reach the rated operating speed, leading to low drum speed and insufficient threshing force; excessive gap between the threshing drum and concave plate cannot completely strip grains; green and wet straws have high toughness and are difficult to thresh; worn threshing teeth and rasp bars reduce threshing performance.

Solutions: Maintain the engine at rated speed during formal harvesting and avoid low-speed loaded operation; fine-tune the gap between the drum and concave plate according to rice humidity and maturity to improve threshing efficiency; reduce feeding volume and slow down harvesting pace for green and wet crops; regularly inspect threshing components and replace worn and failed rasp bars and threshing teeth.

3.2 Impure Rice with High Foreign Matter Content

Failure Symptoms: Harvested rice in the grain tank is mixed with a large amount of broken straw, weeds, and dust, requiring secondary cleaning and wasting time and labor.

Failure Causes: Insufficient fan airflow and offset air outlet direction lead to uneven cleaning airflow; sieve holes are blocked by broken straw and debris; damaged sieves and improper sieve spacing; overfeeding causes the cleaning system to be overloaded and fail to filter impurities thoroughly.

Solutions: Appropriately increase fan airflow and correct the air outlet angle to ensure airflow covers the entire sieve surface; clean blocked sieve debris, replace damaged sieves, and calibrate standard sieve spacing; control harvesting speed to maintain uniform crop feeding and avoid excessive instantaneous load affecting cleaning effect.

3.3 Threshing Drum Blockage and Engine Stalling

Failure Symptoms: The threshing drum operates unsteadily with abnormal noise and jitter. In severe cases, the engine stalls and the whole machine vibrates violently.

Failure Causes: Excessive feeding volume caused by fast harvesting speed exceeds drum processing capacity; wet straws easily wind around the drum and cause blockage; slipping drive belts reduce drum speed; residual crops are not cleaned before shutdown, resulting in straw winding and accumulation.

Solutions: Shut down and lock the machine safely, then thoroughly clean winding and blocked straws inside the drum; tighten drive belts to ensure the drum reaches the rated operating speed; adopt low-speed and reduced-load operation in wet and dense rice fields to avoid overfeeding; idle the machine for 1 to 2 minutes before shutdown to clear residual materials completely.

4. Engine and Electrical System Failures: Power and Early Warning Malfunctions

The engine provides core power for the rice harvester machine, and the electrical system undertakes equipment monitoring and early warning functions. Most failures in this system are caused by long-term insufficient maintenance and continuous operation under harsh working conditions, mainly manifested as insufficient power, warning light activation, startup failure, and engine overheating.

4.1 Insufficient Engine Power and Weak Operation

Failure Symptoms: The engine accelerates slowly during harvesting, prone to speed drop and stalling under slight load, with insufficient traveling and working power.

Failure Causes: Clogged air filter reduces engine air intake; blocked fuel filter and oil pipeline cause poor fuel supply; deteriorated or insufficient engine oil leads to poor lubrication; carbon-deposited fuel injectors result in poor fuel atomization and incomplete combustion.

Solutions: Clean or replace air and fuel filters regularly and dredge blocked oil pipelines; check engine oil level and quality, and replace deteriorated oil in a timely manner; clean carbon deposits on fuel injectors to ensure sufficient fuel atomization and full combustion; avoid long-term low-speed and overloaded operation.

4.2 Dashboard Warning Light Failure (Oil Pressure & Charging Alarm)

Charging Warning Light On: Mainly caused by loose or damaged generator belts and poor line contact. Adjust belt tension, replace damaged belts, and inspect generator wiring terminals to eliminate loose and aging line faults.

Oil Pressure Warning Light On: Triggered by low oil pressure, insufficient engine oil, clogged oil filters, and oil pipeline leakage. Stop the machine immediately for inspection, replenish engine oil, replace clogged filters, and troubleshoot oil leakage points. Do not restart the machine until the fault is completely eliminated.

4.3 Engine Overheating

Failure Symptoms: Rapid water temperature rise and overheating body, accompanied by power reduction, and even radiator boiling in severe cases.

Failure Causes: Straw and dust accumulation block the water tank and radiator and reduce heat dissipation efficiency; insufficient coolant; loose cooling fan belts lead to insufficient fan speed; long-term continuous overloaded operation in high-temperature weather.

Solutions: Stop the machine for natural cooling; never open the water tank cover or add water at high temperature to prevent scalding; thoroughly clean straw and dust attached to the water tank and radiator; replenish standard coolant and tighten fan belts; implement segmented operation in high-temperature summer weather to avoid long-term continuous high-load operation.

5. Hydraulic and Traveling System Failures: Operation and Mobility Problems

The hydraulic system controls core operations such as header lifting and grain tank tipping of the rice combine harvester machine, while the traveling system controls field movement. Common faults including unresponsive operation, weak lifting, and traveling slippage greatly affect operation flexibility and field trafficability.

5.1 Slow, Weak and Sticky Header Lifting

Failure Causes: Insufficient or deteriorated turbid hydraulic oil; clogged hydraulic filters, air-entrapped oil pipelines, and loose pipe joint leakage; severely worn hydraulic pumps cause insufficient working pressure.

Solutions: Check hydraulic oil level and quality regularly, replenish oil in time, and replace deteriorated hydraulic oil; clean clogged hydraulic filters, fasten loose pipe joints, and exhaust air from oil pipelines; replace severely worn hydraulic pumps and valve cores to restore hydraulic system working performance.

5.2 Track/Tire Slippage and Weak Traveling Power

Failure Symptoms: Frequent slippage and deviation in muddy paddy fields with poor climbing and escaping performance.

Failure Causes: Improper track tension and worn track plates reduce grip; abnormal tire pressure; loose traveling drive chains cause large power transmission loss; muddy and soft field soil increases operating resistance.

Solutions: Adjust track tension appropriately and replace severely worn track plates and aging tires; tighten traveling drive chains regularly to ensure smooth power transmission; drive at a constant low speed in muddy paddy fields and avoid sudden acceleration and braking to reduce slippage loss.

6. Safety Operation Rules and Preventive Maintenance Tips

6.1 Safety Operation Guidelines

All equipment inspection, debris cleaning, and parameter adjustment work must be carried out after shutting down the machine and locking safety devices to prevent accidental movement of moving parts such as headers, drums, and grain tanks and avoid personal injury. The machine body, water tank, and exhaust pipe remain extremely hot after operation; never inspect the machine immediately after shutdown to prevent high-temperature scalds. Never operate the machine with faults. Minor unaddressed faults will cause component damage, equipment failure, and even safety accidents.

6.2 Daily Preventive Maintenance

Pre-operation Inspection: Check the integrity of blades, belts, chains, and tracks; verify the liquid level of engine oil, hydraulic oil, and coolant; clean debris on headers, cleaning sieves, and water tanks; conduct trial operation to eliminate hidden faults such as abnormal noise and jamming.

Post-operation Maintenance: Completely clean straw, soil, and dust on the machine body, focusing on key parts such as threshing drums, cleaning sieves, and feeding troughs; apply grease to chains, bearings, and rotating parts to reduce wear and prevent rust and jamming.

6.3 Periodic Maintenance

Replace consumables such as filters, engine oil, and hydraulic oil regularly in accordance with the equipment manual; calibrate blade gaps, belt tension, and fan airflow to ensure standard operating parameters; regularly inspect the tightness of circuits and oil pipelines, and replace aging and cracked pipe fittings in advance to eliminate potential faults from the source.

7. Conclusion

According to field operation experience, most failures of rice harvester machinery are not caused by natural equipment aging, but by improper operation habits, insufficient daily cleaning, unreasonable parameter adjustment, and lack of regular maintenance, which are all controllable human factors. Adhering to core operation principles including low-speed operation adapting to field conditions, uniform crop feeding, real-time debris cleaning, and standardized daily maintenance can greatly reduce high-frequency faults such as blockage and component wear. Mastering professional fault identification and troubleshooting skills enables farmers to quickly resolve on-site breakdowns, seize optimal harvesting time, extend equipment service life, reduce maintenance costs, minimize grain harvesting loss, and effectively improve the overall efficiency and quality of mechanized rice harvesting. For users concerned about rice harvester price and price of rice combine harvester, we can provide targeted quotations and configuration plans according to your operation scale and field conditions.

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