The Case 87434292 Lift Cylinder Seal Kit provides a complete hydraulic cylinder repair solution for Case 521D, 521E, and 521F series wheel loaders. Precision-matched for a 101.6mm (4.0″) bore and 63.5mm (2.5″) rod diameter, this kit combines TPU, PTFE, glass-filled nylon, FKM, and nitrile (NBR) components for reliable performance in demanding lifting operations.

Technical Specifications

Seal Kit Composition

Compatible Case Models

• 521D / 521E / 521F Wheel Loaders
• 621D / 621E / 621F Wheel Loaders
• 821E / 821F Wheel Loaders
• 521D (Serial Numbers JEE0135501 and later)

FAQ

Q: Does this kit fit the early-model Case 521D wheel loaders?
A: This specific part number (87434292) is typically used for 521D models with serial numbers JEE0135501 and later. Early-production 521D units may use different cylinder configurations. Always verify your machine’s serial number to ensure a correct fit.

Q: What is the benefit of the FKM expander in the piston seal?
A: Wheel loader lift cylinders often operate at higher temperatures due to constant cycling. The FKM (Viton) expander inside the PTFE piston seal provides better thermal resistance and elasticity than standard NBR, ensuring the seal maintains a tight grip on the cylinder bore even during long shifts.