12921535 Sany Sheath SY1350C1C3KH Tracked hydraulic excavator spare parts

12921535 Sany Sheath SY1350C1C3KH Tracked hydraulic excavator spare parts

Part number 12921535 is a SANY original part number, specifically designed for the SY1250H mining excavator. This model operates under heavy loads, and its pipes and cables are susceptible to wear and tear from sand and gravel, making protection crucial. It integrates high-strength wear-resistant base material, flexible adaptable structure, sealed dustproof protection, and anti-aging and anti-corrosion properties as core characteristics. It complies with national and industry standards such as GB/T 9266-2009 and EN ISO 5674:2025, and is compatible with core components such as the SSY009114936 cooling pipes and hydraulic pipes. Suitable for open-pit coal mines and metal mines, it prevents pipe and cable damage due to wear and impact, making it a key original part for ensuring continuous operation in mines.

Core technical parameters

Model: 12921535
Main material: Nylon (PA) and thermoplastic elastomer (TPE) are available; Nylon has excellent wear resistance and tensile strength ≥120MPa, which is suitable for wear protection of pipelines[2]; TPE has good flexibility and impact resistance, which is suitable for cable and vibration protection; The material is dense, and there are no burrs or cracks after processing. It has excellent toughness, meets industry standards, and can resist sand and gravel impact and friction, which is suitable for extreme mining conditions.
Operating temperature: -30℃ to 120℃, suitable for the day and night temperature difference and complex environment of open mine, can resist hydraulic oil, dust, acid and alkali corrosion, no aging and cracking, long service life; dimensional stability error ≤ ±0.5%, will not loosen after long-term use, can be used with SSY009114936 cooling pipe to achieve double protection.
Core working parameters: compatible pipe diameter φ25-φ50mm (customizable), conforming to the general specifications of engineering machinery sheaths [8]; wall thickness 1.5-3.0mm, dimensional tolerance ±0.02mm, friction coefficient ≤0.15; wear rate ≤0.05g/1000 rpm (ASTM G65 standard), tear strength ≥25MPa; adopts spiral or split design, easy to install, service life ≥5000 working hours.
Structural Design: The structure adopts spiral winding or split-type integrated molding and is processed by heat setting to fit the protected parts, increasing the contact area by 50% and dispersing local stress; the built-in buffer layer can absorb impact and prevent parts from being damaged by collision and friction; the two ends adopt a snap-lock sealing design to prevent dust and moisture from entering; the flexible structure can adapt to the bending of the parts without affecting the operation of the equipment, and the key parts are equipped with a reinforcing layer to resist vibration and prevent falling off.
Shape and size: spiral or tubular structure (customized according to the protected part), regular shape, size compatible with SY1250H hydraulic pipeline and cable, length customized according to the original factory assembly standard, inner diameter precisely fits the protected part [5][8], mounting hole position accuracy ±0.05mm, can be directly replaced by the original factory.
Surface treatment: It adopts an anti-aging coating, which can withstand salt spray for ≥600 hours, and is corrosion-resistant and UV-resistant; the surface is smooth and burr-free, does not damage the surface of the protected parts, is easy to clean, and can effectively resist the erosion of high dust and high humidity environments in mines, thus extending its service life.

Core functions and roles

As a “protective barrier” for the SY1250H, its core function is to isolate wear, resist impact, seal and prevent dust, protect core components such as hydraulic pipelines and cables, and prevent damage and leakage caused by sand and gravel friction and impact. It can extend the service life of the protected components by 30%-50% and reduce operation and maintenance costs [6]. Together with cooling pipelines, hydraulic pipelines and other components, it forms a whole machine protection system and is a key protective component to ensure stable mining operations.

Applicable Scenarios

Widely used in the protection of the SY1250H machine, it is compatible with the protection of SSY009114936 cooling pipes, hydraulic pipes, wires and cables and shaft parts [3][8], and can also be used with large mining excavators of the same specifications. It is suitable for open-pit mines and earthwork projects with 24-hour continuous heavy load and harsh working conditions. It is an essential protective component for equipment manufacturing, overhaul, after-sales maintenance and bulk purchase.

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1. Pump chamber piping
2. Return oil pipeline
3 SSY009114936 Cooling Pipeline
4. Traveling Pipeline
5 Valve body installation
6-turn pipeline
7. Boom piping
8. Boom and Bucket Piping
9 SSY008119457 Hydraulic oil tank assembly
10 12921534 Sheath
11 12921535 Sheath

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