I. Pre-installed Complete Cylinder Head Assembly (with valves, springs, valve seats, and guides, ready for direct installation)

1. RE533513 (Tier 4 Euro IV 24-valve new assembly, mainstream in the market)
Compatible Models: 8R series tractors, S760 harvesters, 350GLC/380GLC excavators, 670G/770G graders, 1270E forestry machines
Configuration: Complete set of intake and exhaust valves, valve stem seals, springs, valve locks, and valve seats pre-installed
Replacement Parts: RE530370, SE501747 (remanufactured assembly)

2. RE523680 (Tier 2/Tier 3 two-valve older assembly)
Compatible Models: 8130/8245R/8330 older tractors, 9660STS/9770STS harvesters, 350D Old Excavator
* **Universal Replacement Blank Number:** R525583 (Bare cylinder head blank, self-assembly of valves)
* **Bare Cylinder Head (No valve assembly, cylinder block casting only)**
* **R525583:** Basic cylinder head blank, compatible with all Tier 2/Tier 3/Tier 4 series, replaces RE523680 and RE530370.
* **SE501747:** Original factory remanufactured bare cylinder head, original factory refurbished casting, suitable for engineering/generator models.
* **III.** Original factory remanufactured assembly ( official refurbished part)
* **SE501747:** Refurbished complete cylinder head assembly, with complete valve assembly, longer warranty period, suitable for 250D/300D/350G excavators and 724K/824L loaders.
* **IV.** Cylinder head matching individual part numbers (for repair and replacement)
* **Cylinder head gasket (matching 6090)** Overhaul): RE529263 Intake Valve: RE504826 Exhaust Valve: RE504827 Valve Guide: R123178 Valve Oil Seal: RE519116 Valve Seat Ring: RE504828 V. Selection Guide (Procurement Mistakes Avoided) Older Two-Valve Tier2/Tier3 (8130, 9660STS, 350D) Pre-installed Assembly: RE523680; Raw Cylinder Head: R525583 Newer Four-Valve Tier4 Euro IV (8R Tractor, S760, 350GLC) Pre-installed Assembly: RE533513; Refurbished Assembly: SE501747 Complete Overhaul Package Assembly Number: TRE536967 (Includes cylinder head gasket, valve oil seals, and manifold gasket)

Durable and reliable materials: The piston sleeve is made of high-strength alloy cast iron, the piston is made of high-strength alloy, and the bearing alloy layer is wear-resistant and impact-resistant. One-stop solution: Includes all core components required for the overhaul, covering the entire repair cycle even if additional purchases are made. Performance restored to factory condition, etc.: After repair, the engine can be restored to its original factory power level, resolving issues such as burnout, black smoke, and insufficient power.