SSY004929649 Bushing 180×160×76 Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

SSY004929649 Bushing 180×160×76 Sany SY1350C1C3KH Tracked hydraulic excavator spare parts

SSY004929649 is a bushing with a unique part number from Sany, measuring 180×160×76 (outer diameter 180mm, inner diameter 160mm, length 76mm). Specifically designed for the SY1250H 125-ton mining excavator, it integrates a high-strength wear-resistant base material, precision-formed structure, self-lubricating protection, and corrosion-resistant and wear-resistant surface. It is a key component connecting the shaft system of core assemblies such as the SY1250C2C3KH slewing device and travel gearbox. Primarily used in large open-pit coal mines and metal mines for excavation and topsoil stripping operations, its precise dimensional fit and excellent wear resistance support smooth shaft operation, reduce friction and wear between the shaft and housing, absorb impact vibrations from heavy-duty operations, prevent shaft scratches and housing wear, and prevent transmission jamming, abnormal noises, and other malfunctions. Suitable for mining conditions characterized by high temperature, high dust, strong vibration, and large temperature differences, it is a crucial original equipment manufacturer (OEM) part for reducing maintenance costs and ensuring operational continuity in mines.

Core technical parameters

Model: SSY004929649, SANY SY1250H 125-ton mining excavator dedicated bushing, specifications are 180×160×76 (outer diameter 180mm, inner diameter 160mm, length 76mm).
Main material: GCr15 high carbon chromium bearing steel (corresponding to national standard grade, suitable for heavy-duty wear-resistant requirements in mining), after quenching and tempering treatment (oil quenching at 830-850℃ + tempering at 500-600℃) to obtain tempered sorbite structure, hardness reaches HRC58-61, tensile strength ≥1800MPa, excellent fatigue resistance, wear resistance and impact resistance, sulfur and phosphorus content ≤0.025%, non-metallic inclusion grade ≤2.
Operating temperature: -30℃ to 150℃; no brittleness or deformation at low temperatures; maintains good mechanical and lubrication properties at high temperatures.
Key operating parameters: Precise dimensions of 180×160×76mm (outer diameter 180mm±0.02mm, inner diameter 160mm±0.01mm, length 76mm±0.02mm), dimensional accuracy reaching IT7 level, surface roughness Ra≤0.4μm; Adopting a self-lubricating structure design, with built-in graphite solid lubricant, porosity controlled within a reasonable range, it can store lubricating oil, eliminating the need for frequent grease replenishment; coefficient of friction ≤0.15; bearing pressure up to 50-80MPa, effectively supporting heavy-duty shaft systems, absorbing impact vibration, avoiding direct contact wear between the shaft and housing, service life ≥5000 working hours.
Structural Design: It adopts a cylindrical hollow structure with chamfered ends (3×45°) to avoid scratching the shaft and housing during assembly; the inner wall is precision honed and rolled to form a 0.5-1mm cold-worked hardened layer, increasing surface hardness by 15%-20%, residual compressive stress ≥300MPa, and fatigue resistance by more than 30%; the outer wall is smooth and flat, precisely fitting the housing holes; it has built-in self-lubricating graphite holes, evenly distributed on the inner wall.
Shape and Dimensions: The overall structure is a hollow cylinder with a regular shape, free of burrs and cracks. The dimensions precisely correspond to 180×160×76mm (outer diameter 180mm, inner diameter 160mm, length 76mm). It features a 3×45° chamfer, smooth inner wall, and flat outer wall. Dimensional tolerances are strictly controlled. The mounting holes precisely match the shafts and housing holes of the SY1250C2C3KH rotary device and travel gearbox, with a coaxiality ≤0.03mm.

Core functions and roles

As the “core of shaft protection” for the Sany SY1250H 125-ton mining excavator, its core function is to support the smooth operation of the shaft system, reduce friction and wear between the shaft and the housing, absorb the impact vibration generated by heavy-duty operations, compensate for assembly errors between the shaft and the housing, protect the shaft and housing from damage, and ensure the smoothness and stability of the transmission system. In scenarios such as large open-pit mines and water conservancy projects, it not only avoids transmission jamming and abnormal noise caused by shaft scratches and housing wear, but also reduces the frequency of lubrication maintenance and lowers operating costs through its self-lubricating design. At the same time, its high strength, wear resistance, and impact resistance can adapt to the needs of 24-hour continuous heavy-duty operation, reduce shaft sleeve wear and breakage, and reduce downtime for maintenance.

Applicable Scenarios

Widely used in the SY1250C2C3KH slewing device shaft system, travel gearbox shaft end, and working device hinge joint of the SANY SY1250H 125-ton mining excavator, this wear-resistant component is essential for shaft support and wear protection. It is also compatible with corresponding shaft systems of other large mining excavators of the same specifications from SANY. It is particularly suitable for 24-hour continuous heavy-duty operation in harsh conditions (high dust, strong impact, large temperature difference between day and night, high humidity) in open-pit mines and large-scale earthmoving projects. It is an essential wear-resistant part for equipment manufacturing, overhaul, old machine upgrades, and fault repair. It is also suitable for commercial scenarios such as after-sales maintenance and bulk parts procurement. Its original factory precision compatibility and high reliability can significantly reduce modification costs and downtime, avoid damage to transmission components due to bushing failure, and improve the return on investment of projects. It is an indispensable core component in the field of heavy-duty transmission in construction machinery.

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