Tractor Winter Maintenance: The Five Essential Checkpoints

Severe cold in winter poses a rigorous test to the mechanical performance of tractors and is prone to triggering various faults. Strictly observing the following "five checkpoints" can comprehensively enhance the low-temperature adaptability of equipment, effectively prevent malfunctions, and significantly extend the service life of tractors.
1. Comprehensive Maintenance Checkpoint: Lay a Solid Foundation for Low-Temperature Operation
At the onset of winter, a high-standard, full-scale in-depth maintenance must be carried out on the tractor to fully prepare it for operation in low-temperature environments. First, thoroughly descale, clean the core components such as engine cylinder blocks, pistons, connecting rods, as well as transmission parts like gearboxes and rear axles to remove oil stains and impurities left over from summer operations. Then, accurately adjust the clearances of each movable joint and bearing in accordance with the equipment maintenance manual, and fill them with suitable lubricating grease. For example, key parts such as steering knuckle kingpins and connecting rod bearings must be ensured to have sufficient lubrication without jamming.
Focus on inspecting the three major systems of oil circuit, circuit and water circuit:
Oil circuit: Clean the sediments in the fuel filter and oil pipeline, check the working status of the fuel injectors to ensure smooth fuel delivery.
Circuit: Inspect spark plugs, ignition coils and wire connectors one by one, tighten loose connection points to prevent electric leakage and power failure caused by poor contact at low temperatures. For instance, check if there is an oxide layer on the battery terminals, and if so, clean it in a timely manner and apply conductive paste.
Water circuit: Dredge the debris between the radiator fins, check the gaskets of water pipe joints to ensure the entire water circuit is unobstructed, free from the "four leaks" (oil leakage, water leakage, air leakage and electric leakage).
2. Strict Anti-Freezing Checkpoint: Avoid Freezing Damage Risks
When water in the tractor's cooling system freezes, its volume will expand by about 9%, which is very likely to crack thin-walled components such as radiators, water tanks, engine blocks and cylinder heads, causing irreversible damage. For example, the nighttime temperature in northern China often drops below -10℃ in winter; if the cooling water is not completely drained, the water tank may crack overnight, resulting in extremely high maintenance costs.
Therefore, when the minimum temperature in winter approaches 0℃, the habit of "draining all water after each use" must be formed. After each operation, promptly open all water-draining components such as the water tank drain switch and engine block drain plug to completely drain the cooling water and avoid residual water from freezing. If the tractor is equipped with an antifreeze cooling system, select antifreeze that meets the manufacturer's specifications, and it is strictly prohibited to mix antifreeze of different brands and models. Meanwhile, regularly check the antifreeze level and concentration. For example, check the liquid level of the reservoir every half a month, replenish it in a timely manner when it is below the minimum scale line, and completely replace the antifreeze as required before the arrival of winter every year to prevent freezing damage caused by antifreeze failure.
3. Scientific Oil Selection Checkpoint: Ensure Smooth Fuel Supply and Lubrication
At low temperatures, the fluidity of fuel and lubricating oil will decrease significantly, which directly affects the startup and operation of tractors. It is necessary to accurately select the oil type according to the local temperature.
Diesel oil: Choose a grade with a freezing point 5℃–10℃ lower than the local minimum winter temperature to prevent diesel from solidifying in the fuel tank and blocking the oil circuit. For example, the minimum winter temperature in Mohe, Northeast China can reach below -35℃, so -40 or -50 grade diesel should be used; the minimum winter temperature in North China is mostly between -10℃ and -20℃, so -20 or -35 grade diesel is sufficient.
Lubricating oil: The viscosity of engine oil increases as the temperature drops in winter, which increases the engine startup resistance. Therefore, it is necessary to replace it with No. 8 diesel engine oil, which has better low-temperature fluidity and can quickly reach all lubrication parts. For the lubricating oil in the gearbox and rear axle, No. 11 diesel engine oil or No. 20 gear oil can be used. For example, the rear axle of an old tractor has relatively severe wear, and using No. 20 gear oil can improve lubrication and sealing performance and reduce transmission loss at low temperatures.
4. Standardized Startup Checkpoint: Reduce Startup Losses
Tractors are difficult to start in winter, and forced startup is likely to damage components such as starters and batteries. It is necessary to strictly follow the preheating startup process.
Before startup, the engine block must be fully preheated. The most practical method is the "warm water preheating method": repeatedly add and drain warm water below 90℃ into the water tank, let it stay for 2–3 minutes each time to allow the engine block to fully absorb heat. When the temperature of the drained water reaches about 30℃, add hot water above 90℃ at one time, which will improve the startup success rate.
When using electric startup, the duration of each startup must not exceed 5 seconds. If the startup fails once, wait for more than 1 minute before the next startup to avoid burning the starter due to long-term overload. For example, the starter power of some old tractors is relatively small, and continuous startup is very likely to cause overheating damage to the coil. At the same time, the specific gravity of the battery electrolyte can be appropriately increased from the standard 1.28 to about 1.30 to improve the low-temperature discharge performance of the battery and avoid failure to start due to insufficient power.
5. Safe Operation Checkpoint: Prevent Operational Risks
After the engine is started, do not start the tractor immediately. Let it idle for 3–5 minutes, and cover the water tank with a thermal insulation curtain to reduce heat loss. Only when the water temperature rises above 40℃ and the oil pressure shows normal (the pointer is stable within the specified range) can the tractor start slowly. When the water temperature reaches above 70℃ and the engine enters the normal operating temperature, load operations such as plowing and transportation can be carried out, so as to avoid increased engine wear caused by load operation at low temperatures.
In winter, the road surface is prone to icing and has low adhesion coefficient. During driving and operation, special attention should be paid to checking the clutch, steering and braking systems:
The clutch must ensure complete separation and smooth engagement without slipping.
The steering system should be checked for flexible tie rods and ball joints without jamming.
The braking system needs to check the brake fluid level and brake shoe clearance to ensure sensitive and reliable braking. For example, before operating on icy roads, you can test the brakes with an empty vehicle and confirm the braking effect before official operation.