13510938 Sany SY485C1 hydraulic excavator main pump top cover assembly

13510938 Sany SY485C1 hydraulic excavator main pump top cover assembly

The SANY SY485C1 hydraulic excavator main pump top cover assembly (13510938) is a key protective and sealing integrated component of the hydraulic main pump. Manufactured strictly according to SANY’s original design drawings, dimensional tolerances, and process specifications, it is specifically designed for harsh working conditions involving heavy loads, high pressure, and strong vibrations, such as in mining, infrastructure construction, and earthmoving. As the top protective barrier for the core moving components such as the plunger and distributor plate inside the main pump, it undertakes the crucial functions of high-pressure sealing, dust and contamination prevention, and pressure stabilization. It directly ensures that the main pump’s hydraulic oil does not leak and that internal components are not corroded by impurities. It is a high-quality original factory replacement assembly for the SY485C1 excavator’s main pump repair and sealing performance restoration.

The main pump cover assembly is forged from high-strength alloy structural steel, undergoing heat treatment and precision machining to achieve a hardness of HRC32-38. It boasts high structural rigidity and compressive strength, capable of withstanding the main pump system’s maximum working pressure of 35MPa for extended periods without deformation or cracking. The cover’s sealing surface is precision ground, with a flatness error ≤0.01mm. Equipped with original factory-specific high-pressure fluororubber sealing rings, it offers excellent sealing performance, effectively preventing hydraulic oil leakage and protecting the main pump from external dust, mud, and impurities, thus avoiding accelerated wear of core components.

The cover integrates original factory standard functional holes such as pressure detection interfaces, oil inlets, and venting channels. These holes precisely match the mounting pins and bolt holes of the main pump valve body and cylinder, with tolerances controlled within ±0.02mm. Internally reserved lubrication channels are fully connected to the main pump’s lubrication system, ensuring long-term lubrication of moving parts. The surface undergoes a double-layer anti-corrosion treatment of phosphating and electrophoresis, providing strong resistance to corrosion and rust, and enabling it to adapt to dusty and high-humidity construction environments. All mounting threads are rolled and strengthened, resulting in high strength and resistance to stripping. When used with original high-strength bolts, installation is reliable and can withstand severe vibrations during equipment operation.

Core Technical Parameters

Part Model: 13510938
Part Name: Main pump top cover assembly (including seals and installation accessories)
Applicable Model: SANY SY485C1 Hydraulic Excavator
Material: High-strength alloy structural steel, high-pressure resistant fluororubber sealing ring, high-strength mounting bolts
Process: Integral forging, tempering heat treatment, precision grinding, phosphating + electrophoretic anti-corrosion, sealing assembly
Features: Pressure-resistant sealing, precision structure, wear-resistant and vibration-resistant, corrosion-resistant and durable, precise installation
Functions: Main pump top protection, high-pressure sealing to prevent leakage, dustproof and dirt-proof, pressure detection interface reserved, lubrication channel adaptation

Core Advantages

Original factory standard seamless adaptation, no modification required for installation; integral forging + heat treatment, strong pressure and deformation resistance; high-precision sealing surface + special sealing ring, low leakage failure rate; integrated multi-functional holes for convenient maintenance; ensures long-term stable operation of the main pump and reduces hydraulic system failure costs.

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