In recent years, the Agricultural Fourth Division has taken advantage of an interest-free loan from the Finnish government to purchase a batch of 8950 tractors, specifically models from Valmet, including the 8950 and 8550. While these machines have provided significant benefits, some issues have emerged during their operation. To ensure optimal performance and longevity, operators should pay close attention to several key areas regarding usage, maintenance, and servicing.
One of the main problems encountered with the Valmet tractors includes structural failures such as cracks in the fuel tank and gearbox welds, which can lead to leaks of diesel or hydraulic transmission oil. Additionally, early battery failure has been reported, along with the bursting of injection nozzles and breakage of the hydraulic lift arms.
The causes behind these issues are varied. Cracking at the weld seams of the fuel tank is often attributed to the tractor being suspended from heavy agricultural equipment and frequently operating on uneven terrain, leading to excessive stress on the machine’s frame. Battery degradation is commonly linked to long periods of inactivity without proper maintenance, excessive charging currents, blocked vent holes, low electrolyte levels, or imbalanced electrolyte concentrations. The bursting of the injection nozzle is typically caused by high-temperature vaporization of diesel, which can be prevented by keeping the fuel system clean and using properly filtered fuel. Lastly, the breaking of the hydraulic lift arm is often due to overloading the rear-suspended implements and encountering large bumps while working on rough fields.
To prevent these issues and ensure safe and efficient operation, operators should follow certain precautions:
First, it is important not to shut off the engine immediately after heavy-duty or high-temperature operation. Instead, the tractor should be operated at a moderate throttle for 3 to 5 minutes to allow the temperature to decrease before turning it off. Second, avoid running the engine at low throttle (below 800 rpm) for extended periods, as this can result in poor lubrication, reduced oil pressure, and potential damage to the turbocharger. Third, never attempt to start the tractor with a cold throttle, as this can cause unnecessary strain on the engine. Fourth, before starting a tractor that has been parked for a long time, it is recommended to either fill the turbocharger with oil or idle the engine a few times to ensure proper lubrication. Finally, minimize the cleaning of the air filter and avoid using excessive air pressure when blowing out the filter core, as this can damage the internal components.
By following these guidelines, operators can significantly reduce the risk of mechanical failure and extend the lifespan of their Valmet tractors. Regular maintenance and careful operation are essential for ensuring the continued efficiency and reliability of these machines in agricultural settings.
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