Key Features

• Genuine OEM seal—designed to meet John Deere original equipment specifications for reliable sealing.
• Durable elastomer construction—resists heat, pressure, and exposure to hydraulic, diesel fluids, and related media.
• Leak-resistant design—helps prevent fluid loss and contamination ingress in high-temperature, high-pressure systems.
• Simple replacement—ideal for servicing components where the original O-ring has worn, cracked, or hardened.
• Versatile fitment—used in a variety of joints, fittings, housings, and connections where the specified part number is required.
• Ideal for replacement sealing on John Deere tractors, construction equipment, and other machinery where part R158521 is specified.
• Common applications include hydraulic connections, pump housings, transmission components, fuel system fittings and engine housings—where a fluid-tight seal is critical for performance and safety.

Product Details

• Product Type: O-Ring / sealing gasket
• Part Number: R158521
• Construction: Rubber/elastomer sealing ring
• Application: Provides a fluid-tight seal in compatible John Deere equipment systems
• Function: Prevents leakage of oil, hydraulic fluid, fuel or other liquids in assemblies requiring a compatible O-ring
• Replacement guidance: Replace the O-ring whenever components are serviced or replaced to maintain sealing integrity

Compatibility

• Compatible models: John Deere equipment across multiple lines, including Compact Utility Tractors (4M, 5M, 5E); Utility & Row-Crop Tractors (6M, 6R); Heavy Utility & High-Horsepower Tractors (7R, 8R); Industrial, Turf & Construction Machines (loaders, excavators, harvesters).
• Engine platforms: Common on 4.5L and 6.8L John Deere diesel engines and associated hydraulic/pump interfaces.
• Compatibility note: Exact compatibility varies by model, system and serial number—always confirm fitment with your machine’s parts diagram or dealer lookup.