Common Problems with the ZX35U-3 and Turret Cab Greasing Tips

[MikePhua]

The ZX35U-3 mini excavator, produced by Hitachi, is a popular choice for many construction and landscaping projects due to its compact size, powerful performance, and versatility. However, like any piece of heavy equipment, it can experience some common issues over time. In this article, we’ll discuss some of the most frequent problems users face with the ZX35U-3, along with essential maintenance tips, particularly for greasing the turret cab to ensure smooth operation.
Common Problems with the ZX35U-3

1. Hydraulic System Leaks
   One of the most common issues that owners of the ZX35U-3 encounter is hydraulic fluid leaks. These leaks can occur in various parts of the system, such as hoses, fittings, or valves. Over time, hydraulic seals can wear out, leading to pressure drops and performance issues. If you notice a decrease in hydraulic power or spot fluid puddles beneath the machine, it's essential to inspect the hydraulic lines for leaks and replace damaged components promptly.
   
2. Electrical Issues
   Another common problem with the ZX35U-3 involves electrical components. Users have reported issues with faulty sensors, wiring problems, or malfunctioning control panels. These issues can result in warning lights on the dashboard, erratic machine behavior, or the inability to operate certain functions. Regular inspection of the electrical system, including wiring connections and sensors, is necessary to avoid these issues. Ensuring proper grounding and cleaning of electrical connections can prevent malfunctions.
   
3. Overheating
   Overheating can become a concern if the radiator or cooling system is clogged with debris, or if the cooling fan isn’t functioning properly. This can cause the engine to overheat and result in engine shutdowns or damage. To prevent this, regular maintenance of the cooling system is essential. Keeping the radiator and cooling fan clean, and regularly checking coolant levels, can help ensure the ZX35U-3 runs at an optimal temperature.
   
4. Track Tension Problems
   Track tension is another area where issues may arise. If the tracks are too tight or too loose, it can cause uneven wear, premature component failure, and reduced machine performance. Regularly checking and adjusting the track tension is essential, especially in harsh operating environments.
   
5. Uneven Digging Performance
   Some users have noted inconsistent digging performance, which could be attributed to issues with the boom or arm hydraulic systems. If the machine isn’t digging as expected, it might be due to air in the hydraulic lines, low hydraulic fluid levels, or valve issues. Conducting regular checks on the hydraulic system and ensuring that fluid levels are maintained can help keep the machine working efficiently.
   

Greasing the Turret Cab
Proper greasing of the turret cab is crucial to maintaining smooth rotation and preventing excessive wear in the turntable. The turntable allows the upper structure of the machine to rotate over the undercarriage, and without proper lubrication, it can suffer from friction and early failure. Here’s how to ensure proper greasing of the turret cab:

1. Locate the Grease Points
   The ZX35U-3 has specific grease points that must be lubricated regularly to ensure smooth movement of the turret. These grease points are located around the turret rotation joint and should be easily accessible. Refer to the operator’s manual for the exact locations and the recommended grease type for the machine.
   
2. Use the Correct Grease
   It’s crucial to use the correct type of grease for the ZX35U-3. The manufacturer’s guidelines will specify the appropriate grease, usually a high-quality lithium-based grease that can withstand the pressures and temperature variations in heavy equipment applications.
   
3. Grease Regularly
   Regular greasing is necessary to keep the turret rotation smooth. Depending on the operating conditions, it’s recommended to grease the turret at least once a day or every 8 hours of operation. In harsh environments, or with higher machine usage, more frequent greasing may be needed.
   
4. Monitor for Excessive Wear
   As you grease the turret, check for any signs of excessive wear or damage. Listen for any unusual noises during rotation or feel for jerky movement, which could indicate that lubrication is insufficient or that other components are worn out. Early detection of wear can prevent costly repairs down the line.
   
5. Clean Grease Fittings
   Before applying grease, ensure that the grease fittings are clean. Dirt and debris can cause damage to the fittings or contaminate the grease. Use a clean rag to wipe the fittings before applying grease to ensure they are free of contaminants.
   

Conclusion
The ZX35U-3 is a reliable and versatile mini excavator, but like all machines, it requires regular maintenance and attention to keep it performing at its best. Addressing common issues like hydraulic leaks, electrical faults, and overheating will help extend the life of the machine. Additionally, routine greasing of the turret cab is essential to maintain smooth operation and prevent excessive wear. By following these maintenance tips and addressing problems promptly, you can keep your ZX35U-3 in optimal condition for years to come.