Forklift Muffler AF932-30301 – XinChai 490 2-3 Ton

Forklift Muffler AF932-30301 — Exhaust Silencer for XinChai 490 Diesel Engine, 2-3 Ton Forklift Applications

This forklift muffler part number AF932-30301 is a Kingstream OEM exhaust silencer for XinChai 490 diesel engines used in 2-3 ton forklift applications in building material, manufacturing, construction, port, logistics, and freight yard environments. The XinChai 490 is one of the most common 4-cylinder diesel engines in the Chinese forklift market, powering Heli, Hangcha, Lonking, Tailift, and other domestic and export forklift brands in the 2-3 ton capacity range. The AF932-30301 muffler uses a reactive multi-chamber design to attenuate the mid-frequency exhaust noise characteristic of the 490 engine running at its 1500-2500 RPM operating range under load — the expansion chambers and resonant cavities of the reactive design target specific frequency bands without using sound-absorbing packing material that degrades over time from exhaust condensate saturation. A failed muffler on a 490 engine manifests as excessive exhaust noise (clearly audible inside the warehouse), black soot deposits around the muffler seams and flange connections indicating exhaust gas leakage, and in severe cases reduced engine power from altered backpressure — the 490 engine’s mechanically governed fuel injection pump is calibrated for a specific exhaust system restriction, and a rusted-through muffler with zero backpressure changes the air-fuel ratio enough to cause power loss and increased fuel consumption. 5kg with 80×50×50cm packaging. 100% professional tested with 7-15 day delivery.

Installing the AF932-30301 muffler on a XinChai 490 engine requires disconnecting the exhaust manifold flange and tail pipe clamp connections. The exhaust manifold flange gasket must be replaced — reusing the old gasket virtually guarantees an exhaust leak because the gasket has compressed to match the old muffler flange surface, and the new flange inevitably has slightly different surface contours. Clean the manifold flange surface of old gasket material. Torque the flange bolts evenly to specification. After installation, verify no exhaust leaks at both the manifold and tail pipe connections. For 490 engines in frequent stop-start operations, the muffler’s internal condensation cycle is more aggressive than continuous-duty engines, making aluminized steel construction critical for service life.

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Technical Specifications

100% professional tested. Carton box packaging. Kingstream OEM. For bulk orders, contact us.