The CAT 247-8888 Bucket Cylinder Seal Kit provides a complete hydraulic cylinder repair solution for Caterpillar 320D series excavators. Precision-matched for a 120mm bore and 85mm rod diameter, this kit combines high-grade polyurethane (TPU), PTFE, phenolic resin, and nitrile (NBR) components for reliable high-pressure performance.

Technical Specifications

Seal Kit Composition

Compatible Caterpillar Models

• 320D / 320D L / 320D LN / 320D GC
• 319D L / 319D LN
• 321D LCR
• 323D L / 323D LN
• 324D

FAQ

Q: Does this kit include the seals for the 320D L heavy-duty bucket cylinder?
A: Yes, the 247-8888 is designed for the standard 120mm bore bucket cylinders commonly found on the 320D and 320D L. However, some 320D models with specific high-reach or heavy-duty linkage may use a 130mm bore (Cylinder #2897756); always verify your bore size before installation.

Q: Why are the rod seals in this kit made of TPU instead of standard NBR?
A: Bucket cylinders experience high-frequency impacts and external abrasion. TPU (Thermoplastic Polyurethane) provides significantly higher wear resistance and tensile strength than NBR, ensuring a longer service life under the harsh conditions of excavator bucket operations.