Donaldson P502536 equivalent filter

SGL-20805349 P502536 Spin-On Diesel Fuel Filter  The SGL-20805349 fuel filter is a premium spin-on replacement element cross referenced with Donaldson P502536, professionally designed for heavy construction machinery, medium & heavy-duty trucks and industrial diesel power units. Constructed with high-density reinforced multi-layer filter media, this filter efficiently traps rust, sediment, dust, sludge and colloidal contaminants contained in diesel fuel, delivering reliable protection for fuel injectors, high-pressure fuel pumps and precision engine components against abrasion, clogging and premature wear. Manufactured strictly to original OEM dimension specifications, it supports direct plug-and-play installation without modification. Featuring steady fuel flow performance, excellent contaminant holding capacity and economical aftermarket pricing, it is a trusted maintenance spare part for machinery repair shops, construction fleet operators and global filter distributors worldwide. Core material and internal structure: Preparation: Shut down the engine completely, close the fuel inlet valve and release residual pressure within the fuel pipeline. Prepare a filter wrench, oil-absorbent rags and a container to catch spilled diesel fuel during removal. Remove old filter: Turn the old filter counterclockwise to unscrew it fully. Clean the filter mounting base thoroughly to wipe off leftover gasket debris, dirt and residual fuel completely. Gasket treatment: Apply a thin coat of clean diesel fuel evenly onto the new rubber sealing gasket. Do not apply grease, which will cause rubber degradation and sealing failure over time. Install new filter: Hand-tighten the SGL-20805349 filter clockwise until the gasket sits flush against the mounting surface, then tighten an additional 3/4 turn using a wrench. Never over-tighten to avoid thread damage and gasket deformation. Leakage inspection: Restore fuel supply and start the engine to idle for 3–5 minutes. Carefully check the connection joint; installation is successful if no fuel leakage is detected. Replacement schedule: Replace regularly during regular highway or standard working conditions. Shorten the replacement cycle appropriately when operating on dusty construction sites, mining areas or using low-quality diesel fuel.