Engine Crankshaft for 495-Series Forklift Diesel Engine

This crankshaft is a forged steel OEM-spec replacement for the 495-series 4-cylinder diesel engine widely used in 2-4 ton HELI, Hangcha, Lonking, and other domestic-brand internal combustion counterbalance forklifts. The 495 engine platform — sharing its 95mm cylinder bore designation with the XinChai, QuanChai, and Jiangling engine families — powers tens of thousands of Chinese-manufactured forklifts currently in service worldwide. As the engine’s primary rotating assembly, the crankshaft converts the reciprocating motion of four pistons and connecting rods into smooth rotational torque through five main bearing journals, delivering power to the flywheel, transmission, drive axle, and ultimately the front wheels. A crankshaft that has suffered journal scoring, bearing spin damage, or fatigue cracking will produce progressively worsening symptoms: low oil pressure at idle (below 1.0 bar hot), metallic knocking that increases with engine RPM, visible vibration at the crankshaft pulley, and eventually seizure or catastrophic block damage if the failure propagates to the connecting rods.

The crankshaft is manufactured from high-grade forged alloy steel (42CrMo or equivalent) through a multi-stage hot forging process that orients the grain flow along each crank throw for maximum fatigue resistance at the highly stressed fillet radii between journals and webs. After forging, the journals are induction-hardened to a case depth of 2-4mm with a surface hardness of 50-55 HRC, providing the wear resistance necessary for the boundary and mixed-film lubrication conditions that occur during cold starts and low-speed, high-load forklift operation. Each main and connecting rod journal is precision-ground to final dimensions with tolerances of +0/-0.015mm and a surface finish of Ra 0.2μm, then micro-polished to remove grinding directionality that could cause premature bearing wear. The oil galleries are drilled, chamfered, and deburred to ensure unrestricted oil delivery from the main bearings to the connecting rod bearings. After machining, the crankshaft undergoes dynamic balancing to within 15g·cm correction, minimizing engine vibration and extending main bearing life.

Direct OEM replacement for 495-series diesel engines including XinChai 495, QuanChai 495, and compatible 4-cylinder industrial engines. Fits HELI CPCD20-CPCD40, Hangcha CPCD20-CPCD40, Lonking LG20DT-LG40DT, and equivalent 2-4 ton forklifts. When replacing the crankshaft, always install new main bearings, connecting rod bearings, and thrust washers matched to the crankshaft journal grade — standard size or first/second undersize depending on whether the journals have been reground. Measure all bearing clearances with Plastigauge (0.040-0.090mm mains, 0.030-0.080mm rods typical) and verify crankshaft end float (0.05-0.25mm). Replace the front timing cover seal and rear main seal during installation. After assembly, pre-lubricate the oil pump and crank the engine without fuel until oil pressure builds on the gauge. For compatible main bearings, rod bearings, piston ring sets, timing gears, oil seals, and complete engine overhaul gasket kits, visit our Forklift Engine Parts section. For 495 engine service specifications, refer to XinChai Power technical documentation.

Technical Specifications

• SKU: 495-CRANKSHAFT
• Engine: 495-Series 4-Cylinder Diesel (XinChai / QuanChai Compatible)
• Type: Forged Steel Crankshaft, 5-Main Bearing
• Material: Forged 42CrMo Alloy Steel
• Hardness: Induction Hardened Journals, 50-55 HRC, 2-4mm Depth
• Journal Finish: Ra 0.2μm, Micro-Polished
• Balance: Dynamic Balanced to 15g·cm
• Oil Galleries: Drilled, Chamfered & Deburred

Compatible Forklift Models

Each Kingstream 495 crankshaft undergoes comprehensive QC: multi-point journal diameter measurement with 0.001mm accuracy, roundness verification on a precision rotary fixture, surface roughness profilometer inspection, magnetic particle crack detection on all journals and fillet radii, and dynamic balance verification on a computerized balancing machine. The crankshaft ships with a heavy preservative coating on all machined surfaces, each journal individually wrapped in VCI anti-corrosion paper, packed in a reinforced wooden crate with desiccant. 12-month warranty. Always pre-lubricate bearings and journals with engine assembly lube, and replace the crankshaft pulley bolt with a new OEM-spec fastener torqued to specification. For complete 495 engine overhaul kits, contact our technical team.