Dust Seal
Пылевое уплотнение
Sello de polvo
The OEM reference 329900987 identifies a high‑quality dust seal engineered for XCMG hydraulic excavator pivot points, including bucket linkages, arm joints, and track adjusters. This genuine sealing component acts as the first line of defence against abrasive particles, moisture, and contaminants, protecting critical bearings and bushings from premature wear. Manufactured from a specially formulated polyurethane compound with excellent abrasion resistance and flexibility, the 329900987 dust seal ensures reliable sealing performance, extended component life, and consistent machine uptime in the most aggressive digging and loading environments.
This dust seal is a direct OEM replacement, fully compatible with XCMG excavator pin and bushing assemblies, and features a precision‑moulded lip profile that provides a tight, effective barrier against external contaminants while accommodating the slight axial and radial movements of the joint. The seal’s unique geometry also assists in retaining grease, ensuring that the lubricant remains within the bearing interface for longer periods. The part number 329900987 undergoes rigorous material testing, dimensional inspection, and environmental durability validation to meet ISO 9001 and CE quality standards, guaranteeing the same level of protection as the original factory seal.
When replacing a worn, hardened, or cracked dust seal, choosing the genuine 329900987 ensures the correct hardness, shape, and fitment. The advanced polyurethane compound resists oil, ozone, and temperature extremes, maintaining its elasticity and sealing force throughout its service life. This combination of robust material science, precision manufacturing, and proven design makes the 329900987 the definitive choice for fleet operators seeking maximum joint protection, reduced maintenance costs, and lowest total cost of ownership.
| Parameter | Specification |
|---|---|
| OEM Part Number | 329900987 |
| Product Name | Dust Seal (Wiper Seal) |
| Brand | XCMG (Genuine OEM) |
| Compatible Excavators | XE215, XE270, XE335, XE370, XE400, XE490, XE700, XE900 |
| Material | High‑performance polyurethane (PU), 92 Shore A |
| Inner Diameter (ID) | 70 mm ± 0.1 mm |
| Outer Diameter (OD) | 90 mm ± 0.2 mm |
| Width (thickness) | 12 mm ± 0.3 mm |
| Lip Design | Single lip, self‑energising, with grease‑retention groove |
| Temperature Range | -45 °C to +120 °C |
| Abrasion Resistance (DIN 53516) | ≤ 20 mm³ volume loss |
| Oil Resistance (ASTM D471) | ≤ 5% volume change (IRM 903, 100 h, 100 °C) |
| Ozone Resistance (50 pphm, 40°C, 72 h) | No cracks (pass) |
| Weight (unit) | 0.065 kg ± 0.005 kg |
| Certification | ISO 9001, CE, REACH compliant |
The 329900987 dust seal is the result of XCMG’s extensive research into elastomer performance and sealing dynamics. The polyurethane compound is specifically formulated to provide an optimal balance of hardness, elasticity, and wear resistance. Its high tensile strength and tear resistance ensure that the seal maintains its integrity even when subjected to repeated impact and abrasive particles, while its flexibility allows it to conform to slight misalignments and shaft deflections without losing its sealing force.
The lip geometry incorporates a pre‑loaded wiper edge that exerts constant pressure against the pin surface, effectively scraping away dirt and moisture with every movement. The self‑energising design ensures that the sealing force increases with internal pressure, making it particularly effective in high‑pressure grease applications. The groove on the inner face of the seal acts as a grease reservoir, releasing lubricant to the bearing interface during operation and extending the interval between greasing cycles.
The manufacturing process uses precision injection moulding, with tight control over temperature, pressure, and curing time to ensure consistent material properties and dimensional accuracy. Each seal is individually inspected for flash, surface imperfections, and lip contour, using optical measurement systems to guarantee it meets the original equipment specifications. The result is a product that offers reliable, long‑lasting protection for the most critical pivot points on your excavator.
The 329900987 dust seal is designed to fit all XCMG excavators that use the standard 70 mm inner diameter pin seals, covering the XE215, XE270, XE335, XE370, XE400, XE490, XE700, and XE900 series. It supersedes earlier part numbers 329900986 and 803164741, with an improved lip profile that reduces friction and enhances the seal’s wiping action.
Installation is a simple procedure: remove the retaining ring or housing cap, carefully remove the old seal using a suitable pick or seal remover, clean the housing and pin surfaces, and press the new seal into place using a clean, flat tool to ensure it seats squarely. Lubricate the lip with a thin coat of grease before assembly to prevent initial dry‑running and ensure immediate sealing performance. Always inspect the pin and bore for burrs or damage that could compromise the new seal.
Extensive field tests conducted in abrasive sand, wet clay, and rocky quarry environments have demonstrated that the 329900987 dust seal significantly extends the life of the pin and bushing assemblies. In a comparative study, machines equipped with genuine XCMG seals showed a 40% reduction in bushing wear and a 50% reduction in pin wear after 4,000 operating hours compared to those using generic seals. Operators reported fewer greasing intervals and noticeably less play in the linkage joints.
The seal’s resistance to chemical attack and temperature extremes has been validated in both sub‑zero winter conditions and high‑summer heat, with no hardening, cracking, or loss of lip pressure observed. This consistent performance translates into lower maintenance costs, reduced downtime, and a more predictable service schedule, making it a critical component for cost‑conscious fleet operators.
Regular inspection of the dust seal is a key part of preventive maintenance. Every 250 operating hours, visually check the seal for signs of hardening, cracking, or excessive wear on the lip edge. Also, inspect the area around the seal for any accumulation of dust or foreign material that could indicate that the seal is no longer providing a tight barrier. If the seal is damaged or shows significant wear, it should be replaced immediately.
When greasing the pivot point, ensure that the grease gun nozzle fits the grease fitting correctly and apply grease until fresh grease emerges from the seal’s lip. This purges any contaminants that may have entered the bearing area and replenishes the grease reservoir in the seal. Avoid over‑greasing, which can dislodge the seal or force it out of its housing.
For machines operating in highly abrasive or corrosive conditions, consider replacing the seal every 2,000 hours regardless of its visual condition, as microscopic wear can compromise its performance. When storing spare seals, keep them in a cool, dark place, away from ozone sources (electric motors, welding equipment) and direct sunlight, which can accelerate ageing. By following these simple maintenance practices, you can ensure that your dust seal delivers maximum protection throughout its service life.
Every 329900987 dust seal is supplied with a test certificate confirming material hardness, tensile strength, and dimensional measurements. The production process is certified to ISO 9001:2015, with full traceability of raw materials and batch records. The polyurethane compound is tested for oil and ozone resistance, and each seal is inspected for flash and surface defects using automated vision systems.
The product carries CE marking and is REACH compliant, ensuring it meets the safety and environmental requirements for use in the European Union. Its design has been validated through finite element analysis and extensive field testing, confirming that it provides the same level of protection as the original equipment seal. By choosing the OEM‑spec 329900987, you invest in a dust seal that has been engineered specifically for your XCMG excavator, ensuring the longevity and reliability of your machine’s pivot joints.
