PC1250 Track Roller 21N-30-00120 For Komatsu Excavator

The main reasons for Komatsu track roller oil leakage are as follows:
Impact of the working environment: When the excavator is operating, if the track roller is immersed in water for a long time, the floating seal ring and the O-ring groove are easily corroded; in muddy water during winter construction, the floating seal ring may freeze and fail, causing oil leakage.

Sealing ring problems: The sealing ring material is unqualified. After contact with lubricating oil, it is easy to expand and deform, lose elasticity, and age prematurely. The hardness (Shore A) does not meet the design requirements, resulting in poor sealing and oil leakage.

During assembly, if the floating seal rubber ring does not fit the floating seal ring groove or is not in close contact with the floating seal ring, the floating seal rubber ring will apply uneven pressure to the floating seal ring, resulting in increased local blade wear when the floating seal ring rotates, and then oil leakage. When assembling the inner and outer covers, if the edge of the O-ring is cut, half of it is stuck outside the ring groove, or it is twisted when installed in the ring groove, it will reduce the sealing performance and service life of the O-ring.

Pressure change: During the air tightness inspection, if the pressure does not reach a certain value, no leakage may be detected. There will be no leakage after oil injection.

However, after the excavator has been working for a period of time, the friction and temperature of the track roller components will increase, and the internal cavity pressure will rise to a certain level, which will cause leakage.

Compared with other brands, our PC1250 rollers have obvious advantages:

Design adaptability: Specifically designed for the overall structure and working characteristics of the Komatsu PC1250 excavator, it perfectly matches the chassis system, can give full play to the excavator's performance, and can operate stably in various working conditions.

Superior material performance: High-quality steel is selected, such as 40MnB2 high-wear-resistant boron steel for the wheel body and 42CrMo for the center shaft. After special heat treatment, it has excellent compression resistance, bending resistance, impact resistance, wear resistance and fatigue resistance, greatly extending the service life.

Exquisite manufacturing technology: advanced forging, precision machining, heat treatment, welding and sealing processes ensure that the track rollers have high dimensional accuracy, solid structure, good sealing and stable and reliable performance.

Easy maintenance: The structural design facilitates daily inspection and cleaning, easy oiling, long maintenance cycle, strong versatility of parts, easy replacement, low maintenance difficulty and low maintenance cost.

Brand service guarantee: We can provide comprehensive technical support and accessories supply, and promptly solve problems encountered by users during use.

Good lubrication is crucial to roller performance. Inadequate lubrication can exacerbate seal damage and bearing wear, reducing roller life and even leading to premature failure. Komatsu PC1250 rollers maintained with grease require regular grease application, recommended every 500 hours.

When filling oil, use a oiler to add gear oil into the supporting wheels. If necessary, the viscosity of the lubricating oil can be appropriately increased.

Before refilling, be sure to drain the expired gear oil first, then add new gear oil to the oil plug hole until the oil flows out. When installing the oil plug, use a torque wrench to control the tightening torque within the range of 157-255N·m.