7L4774 239-2402 2392402 0969529 096-9529 2242639 224-2639 NBR Black Oring Hydraulic Cylinder Loader Seal Kit

7L4774 239-2402 2392402 0969529 096-9529 2242639 224-2639 NBR Black Oring Hydraulic Cylinder Loader Seal Kit

Version 1 (Material & Seal Composition Focus)

Excavator loader hydraulic cylinder rebuilds often require the NBR black O-ring kit that includes 7L4774, 239-2402, 2392402, 0969529, 096-9529, 2242639, and 224-2639. The 7L4774 nitrile rubber O-ring provides excellent compression set resistance for loader lift applications. When assembling a tilt cylinder gland, seal 239-2402 (also listed as 2392402) ensures zero leakage at static interfaces. The NBR black O-ring designated 0969529, or 096-9529 in short form, withstands petroleum-based hydraulic oils. Part number 2242639 (identical to 224-2639) complements the kit by sealing internal piston passages. Each hydraulic cylinder loader kit containing 7L4774 and 2392402 delivers reliable performance across temperature swings. Excavator technicians recognize 096-9529 and 224-2639 as critical backups for dynamic sealing zones.

Version 2 (Application & Cross-Reference Focus)

For excavator loader cylinder service, the NBR black O-ring set featuring 7L4774, 239-2402, 0969529, and 2242639 covers most bore sizes. The loader lift tilt function depends on 2392402 (the six-digit equivalent of 239-2402) for rod end sealing. Part number 096-9529, also written as 0969529, fits groove dimensions common to Japanese excavator models. When ordering a hydraulic cylinder seal kit, include 224-2639 or 2242639 to secure the backup ring positions. The NBR black O-ring 7L4774 pairs with 239-2402 to create a dual barrier against external contamination. Excavator owners stocking 0969529 and 2242639 reduce downtime during emergency field repairs. Every loader kit should verify that 7L4774, 2392402, 096-9529, and 224-2639 are all present before disassembly.