Ce-Approved Sy305/Sy335/Sy365/Sy485 Excavator Long Reach Boom and Arm for Sale

All steel plates are 45° beveled by a beveling machine before welding, ensuring full penetration and structural integrity.

Main welding is performed by robotic machine, producing welding seams that are very solid, durable, and even.

Consistent weld quality across the entire boom and arm structure supports long-term reliability under heavy-duty operation.

To achieve higher machining accuracy, we operate a 30 m boring machine used to process larger-diameter pin holes after welding. It meets micrometer accuracy requirements and ensures both pin centers remain in one line.

Our metal pipes are welded by robotic welding, which effectively prevents oil leakage compared with manual welding.

Hydraulic cylinders are customized from the S-ANY factory for reliable performance and long service life.

Material: 40Cr. All pins are hardened to enhance hardness above 55HRC, tempered to enhance toughness, and ground to enhance precision — greatly increasing the service life of the long boom.

All high-pressure hoses use the American EATON brand for dependable performance in demanding conditions.

We use Japan KANSAI paint, the same supplier used by excavator factories such as HITACHI and KOBELCO. This ensures the color matches original machines 100% and delivers a durable, professional finish.

Steel structure: You need to provide photos or videos of the failure to prove that the defect arises from our material or workmanship rather than improper operation. If proven to be a defect in our material or workmanship, we will direct you on how to remedy the failure, and you may charge us for those remedy expenses. Please note that you must follow our directions when performing the remedy under such circumstances; otherwise, we will not take any responsibility.

Accessories (cylinder, pipes, hoses, pins): You also need to provide photos or videos to prove that the defect arises from our material or workmanship rather than improper operation. If proven to be a defect in our material or workmanship, we will send you replacement parts free of charge.