L9030240A0 Inter Gear Transfer Box Device ZQC2000 Parts For Mining Truck

‌Manufacturing Process for L9030240A0 Transfer Case Gear Assembly (ZQC2000 Liugong Mining Truck)‌

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20CrMnTiH alloy steel‌ with 58–62 HRC post-carburizing.

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Perform CNC hobbing for 35-tooth helical gears; grind to ±0.005 mm profile tolerance.

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QT500-7 nodular iron‌ with 0.02 mm flatness tolerance on mating surfaces.

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Induction-harden shafts (55–60 HRC depth: 3–5 mm) per ISO 2639.

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Press-fit tapered roller bearings with 0.05–0.08 mm preload.

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Run 4-hour load cycles (max 2,500 N·m torque) with IR thermal imaging (<85°C pass).

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Gear noise <=78 dB(A).

CMM-verify backlash (0.10–0.15 mm) and tooth contact patterns (>=90% area).

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