high-pressure hose models for excavator booms
In the operation of large excavators, the hydraulic hoses for excavator arms are core components that bear high pressure, high-frequency pulses, and frequent bending, directly determining the stability and safety of the equipment. Many users often ask when purchasing, maintaining, or replacing: what types of hoses are used for large excavator arms? Combining international general standards and engineering practice, this article details the common hose models for excavator booms, sticks, and bucket cylinders, including mainstream models such as EN856 4SH, SAE100 R12, EN856 4SP, SAE100 R13, to help you quickly select and accurately match the right hose.
1. Core Logic for Selecting Hoses for Large Excavator Arms
The boom, stick, and bucket cylinders of large excavators (above 20 tons) are under ultra-high pressure, high-pulse, and dynamic bending working conditions, with a working pressure usually between30–42MPa. Therefore, hoses with four or more layers of steel wire winding are preferred, mainly following the two major systems of EN856 (European standard) and SAE100 (American standard), which balance pressure resistance, fatigue resistance, oil resistance, wear resistance and other performances.
2. Complete List of Hose Models for Large Excavator Arms (Including Standards and Uses)
1. EN856 4SH High-Pressure Steel Wire Wound Hose
EN856 4SH is the preferred model for the main cylinders of large excavator arms, with a four-layer high-strength steel wire winding structure, strong pressure-bearing capacity and excellent anti-pulse performance, suitable for the main oil circuits of excavator booms and sticks.
- Standard: EN856
- Structure: 4-layer steel wire winding
- Working pressure: 35–42MPa
- Applicable parts: Main cylinders of 20–50 ton large excavator booms and sticks
- Advantages: Ultra-high pressure, long pulse life, suitable for extreme heavy-load working conditions
2. SAE100 R12 High-Pressure Hydraulic Hose
SAE100 R12 has similar performance to EN856 4SH, which is an internationally general four-layer steel wire wound ultra-high pressure hose. It is a mainstream supporting model for excavator arms and is widely used in domestic and foreign brand excavators.
- Standard: SAE100 R12 (SAE J517)
- Structure: 4-layer steel wire winding
- Applicable parts: Main cylinders of large excavators and main pipelines of hydraulic breakers
- Features: Strong versatility, suitable for imported/domestic excavators, high and low temperature resistance
3. EN856 4SP Medium-High Pressure Steel Wire Wound Hose
EN856 4SP also has a four-layer steel wire winding structure, with a pressure level slightly lower than 4SH, suitable for the stick, bucket cylinder, and auxiliary high-pressure oil circuits of large excavators.
- Standard: EN856 4SP
- Structure: 4-layer steel wire winding
- Working pressure: 30–38MPa
- Applicable parts: Sticks, bucket cylinders, and auxiliary circuits of large excavators
- Advantages: Better flexibility, small bending radius, suitable for installation in narrow spaces
4. SAE100 R13 Ultra-High Pressure Steel Wire Wound Hose
SAE100 R13 is a 4–6 layer steel wire wound hose, belonging to the ultra-high pressure level. It is specially designed for extra-large excavators above 50 tons and mining excavator arms to cope with strong impact and high-load scenarios.
- Standard: SAE100 R13
- Structure: 4-layer/6-layer steel wire winding
- Working pressure: Up to 45MPa or more
- Applicable parts: Mining excavators above 50 tons and main pipelines of large hydraulic breakers
- Features: Explosion-proof, anti-aging, dedicated for heavy loads
5. Other Common Supporting Models
- EN853 2SN/SAE100 R2AT: Double-layer steel wire braided, used for pilot pipelines and control oil circuits of excavator arms
- EN857 2SC: Small outer diameter and ultra-soft, suitable for bending installation in compact spaces of excavator arms
- ISO18752 CC/DC: New generation constant pressure hose, replacing traditional 4SP/4SH, lightweight and long service life
3. Suggestions for Matching Hose Models with Excavator Tonnage
- 20–30 ton excavators: Main cylinders EN856 4SH / SAE100 R12; auxiliary oil circuits EN856 4SP
- 30–50 ton excavators: Main cylinders EN856 4SH / SAE100 R13
- Above 50 tons/mining type: SAE100 R13 6-layer steel wire wound model
4. Summary
The hoses dedicated to large excavator arms are mainly high-pressure steel wire wound types. EN856 4SH, SAE100 R12, EN856 4SP, SAE100 R13 are the four most commonly used core models, corresponding to the high-pressure hydraulic needs of different tonnages and different parts. When selecting, prioritize pressure level, number of steel wire layers, installation space and bending frequency to ensure that the hose is accurately matched with the working conditions of the excavator arm, reducing the risk of pipe bursting, oil leakage and shutdown.
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