XCMG Intermediate Gear OEM 800172336 – Precision Engine Timing Component for Articulated Dump Trucks

The XCMG Intermediate Gear 800172336 is a precision-engineered timing component used in the engine timing gear train of XCMG articulated dump trucks (ADTs). This genuine XCMG 800172336 intermediate gear serves as an idler wheel that transmits rotational motion from the crankshaft gear to the camshaft gear while reversing the direction of rotation. XCMG XDA30, XDA40, XDA45, XDA45U, and TA30 ADTs depend on 800172336 for precise valve and injection timing synchronization. Manufactured from case‑hardened alloy steel with precision‑cut involute teeth, 800172336 ensures accurate timing under the extreme torsional loads of engines producing up to 390 kW (523 hp) and 2,600 N·m of torque.

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Parameter	Specification / Detail
OEM Part Number	800172336
Product Name	Intermediate Gear / Idler Gear / Timing Intermediate Gear
Brand	XCMG (Genuine OEM)
Material	Case‑Hardened Alloy Steel (20CrMo / SAE 8620 Equivalent)
Gear Type	Spur Gear / Involute Profile
Number of Teeth	48 (OM460/OM502 Engine Specifications)
Gear Module (Pitch)	Module 3 (Metric Standard)
Pressure Angle	20° (Standard Involute Profile)
Tooth Hardness	58‑62 HRC (Induction Hardened / Carburized Case)
AGMA Quality Class	Class 9 (Precision Ground)
Shaft Mount	Press‑Fit or Bolted (Engine‑Specific)
Compatible ADT Models	XCMG XDA30, XDA40, XDA45, XDA45U, TA30
Compatible Engines	Mercedes‑Benz OM460LA, OM502; Yuchai YC6K; Weichai WP13
Lubrication	Pressurized Engine Oil (Splash and Spray)
Quality Standards	IATF 16949:2023, ISO 9001:2025, AGMA 2000
Country of Origin	China (XCMG Group)

The intermediate gear 800172336 is part of the engine’s timing gear train, transferring rotational power from the crankshaft to the camshaft, injection pump, and auxiliary components. Because the camshaft rotates at half the speed of the crankshaft, the intermediate gear must reverse the direction of rotation while maintaining perfect tooth‑to‑tooth meshing. The XCMG intermediate gear 800172336 is precision‑hobbed with an involute profile to ensure smooth engagement and minimize backlash under heavy cyclic loads.

In engines like the Mercedes‑Benz OM460LA used in the XDA45U ADT (360 kW, 2,300 N·m) or the OM502 V8 used in the XDA40 (350 kW), the intermediate gear 800172336 must withstand dynamic loads that spike during variable-speed operation. Any wear or misalignment in this gear directly affects valve timing and can cause loss of power, increased emissions, or catastrophic piston‑to‑valve contact.

The intermediate gear 800172336 is produced from 20CrMo alloy steel, a material selected for its excellent case‑hardenability and high core toughness. The blank is forged to near‑net shape, rough‑machined, then carburized to achieve a hardened case depth of 0.8‑1.2 mm (58‑62 HRC) while maintaining a softer, ductile core. After heat treatment, the teeth are precision‑ground using CNC gear grinders to achieve AGMA Quality Class 9, ensuring tooth‑to‑tooth error below 0.025 mm and runout within 0.05 mm.

Every intermediate gear 800172336 is subjected to 100% magnetic particle inspection (MPI) to detect surface cracks, followed by a final lapping operation that creates a mirror‑like tooth surface finish (Ra ≤ 0.4 μm). This ultraprecise finishing reduces friction and noise while extending the service life of both the gear and the mating timing gears. Such meticulous quality control is why the genuine 800172336 intermediate gear outlasts aftermarket alternatives.

XCMG field data from XDA40 and XDA45U fleets operating in Australian iron ore mines shows that the genuine intermediate gear 800172336 typically exceeds 12,000‑15,000 operating hours before tooth wear becomes measurable. Aftermarket gears often fail at 6,000‑8,000 hours due to inadequate case depth, inferior material, or poor tooth geometry, leading to gear whine, increased backlash, and ultimately timing drift.

Common failure indicators for a worn intermediate gear 800172336 include gear whine or rattle from the timing case, rough engine operation, hard starting, and visible tooth pitting or spalling when inspected. If the gear shows advanced wear, the mating crankshaft and camshaft gears should also be inspected, as worn gears tend to accelerate wear on all mating components.

When replacing the intermediate gear 800172336, always use genuine XCMG mounting bolts and torque them to the engine manufacturer’s specification (typically 45‑55 N·m for M10 bolts). Verify that the gear rotates freely with no axial play after installation. Correct gear backlash must be measured using a dial gauge (0.05‑0.15 mm is typical). Always set the engine to top dead center (TDC) before loosening or removing the intermediate gear to preserve engine timing.

During reassembly, align the timing marks on the intermediate gear 800172336 with those on the crankshaft and camshaft gears. These marks ensure correct valve and injection timing. After timing is verified, rotate the engine manually through two full revolutions and recheck the marks. XCMG recommends inspecting the intermediate gear thrust washer and bearing during replacement, as these components also wear over time.

The intermediate gear 800172336 is compatible with the full XCMG ADT range, including XDA30 (30‑ton payload, 280 kW), XDA40 (39‑ton payload, 350 kW OM502 V8), XDA45 (41‑ton), XDA45U (41‑ton, OM471, 390 kW), and TA30 (30‑ton). It fits both Mercedes‑Benz OM460LA and OM502 engine platforms, as well as Yuchai YC6K and Weichai WP13 variants. The intermediate gear is also used in XCMG wheel loaders (LW series) and motor graders (GR215, GR300, GR350) that share the same gear train architecture. Use the inquiry button above to request a quote or place an order for genuine XCMG intermediate gear 800172336.

XCMG and the XCMG logo are registered trademarks of Xuzhou Construction Machinery Group Co., Ltd.
OEM part number 800172336 is an original manufacturer reference for a genuine XCMG intermediate gear. All specifications are derived from XCMG engineering standards and field validation data.