1005121-630-0000 Euro 3 Flywheel With Crown

The 1005121-630-0000 Euro 3 flywheel with crown gear is a critical power transmission and starting component for Euro 3-compliant heavy-duty trucks and construction machinery (tractor trucks, cargo trucks, excavators). It stores rotational energy and collaborates with the starter motor to start the engine.

During engine operation, the flywheel stores excess energy from the combustion stroke, offsets energy shortages in other strokes, and ensures stable engine rotation to avoid stalling. Its outer crown gear meshes with the starter gear, converting electrical energy to mechanical energy to crank the engine.

Crafted from high-quality materials-QT500-7 ductile iron (rigid and impact-resistant) for the flywheel body and heat-treated 40Cr alloy steel (wear-resistant) for the crown gear-this integrated component delivers stability at high speeds. It is a direct fit for Euro 3 engines with no modifications needed. It resists 120℃ heat, high centrifugal force, and startup impacts, preventing cracking and tooth breakage. Easy to replace (remove the transmission, install the new flywheel, and fasten bolts), it passes strict pre-shipment tests for balance, hardness, and fatigue, guaranteeing reliability.

Good energy storage: Reduces speed fluctuation by 40%, stable power output.

Wear-resistant crown gear: 2.5x longer life than ordinary ones.

High balance: ≤5g·cm precision, no vibration/noise.

Fits Euro 3 engines: No mods, saves 35% maintenance time.

Only for heavy-duty trucks/engineering machinery with Euro 3 engines (Weichai WP10/Yuchai YC6L/Dongfeng Cummins ISDe). No non-Euro 3 engines or other specs-different dimensions, won't fit.

Product Model: 1005121-630-0000Applicable vehicles/engines: Euro 3 emission-standard engines (Weichai WP10/Yuchai YC6L/Dongfeng Cummins ISDe)

Type: Flywheel with crown (ductile iron + 40Cr alloy steel)

Function: Store energy, stabilise the engine, cooperate with the starter

Material: Ductile iron flywheel body; 40Cr alloy steel crown gear

Installation: Direct replacement (fits Euro 3 engine specs)

Working conditions: -30℃~120℃; ≤2500rpm; ≤5g·cm balance; 350k+ km life

Q1: Works on Euro 4 heavy-duty trucks?

A1: No-Euro 4 engines have different structure, size, and balance requirements. It causes mismatched install, poor balance, or failure to start-leads to vibration, high fuel consumption, or engine damage. Get a Euro 4-specific flywheel instead.

Q2: Engine abnormal vibration after new flywheel install?

A2: First check installation (align with crankshaft pin, no misalignment). If good, inspect bolt torque (insufficient torque causes looseness/vibration). If bolts are fine, replace the flywheel (rare balance defect).

Q3: How to maintain the flywheel?

A3: 1. Check for wear/cracks/deformation during engine maintenance (replace if damaged); 2. Keep surface clean, no oil/debris; 3. Avoid frequent forced startup; 4. Ensure starter gear meshes well with crown gear (adjust starter if needed).

Q4: Can the crown gear be replaced independently?

A4: No-crown gear and flywheel body are integrally connected by hot pressing + welding. Independent replacement affects firmness and balance, causing safety hazards. Replace the entire flywheel if the crown gear is damaged.

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