Highlight:
Heavy Duty Hydraulic Cylinder Seal Kit
, Mining Excavator 990K Seal Kit
, 990H Hydraulic Cylinder Seal Kit
1. Quick Details of seal 521-7796:
| Part NO. |
521-7796 |
| Machine |
wheel loader |
| Size |
OEM |
| Material |
NBR |
| Oil seal type |
SEAL KIT
|
2. 521-7796 picture:
3. Service part number :
| PART NO. |
PART NO. |
Part NO. |
| 1J6474 |
2K2961 |
3K-0360 |
| 5F3999 |
1411774 |
6V-9746 |
| 1S0668 |
2R0098 |
3J-1907 |
| 6H3997 |
6V5059 |
6V-8397 |
| 1790464 |
8C5176 |
3D-2824 |
| 277-9940 |
8C5175 |
5K-9090 |
| 152-3968 |
1H7339 |
5P-2235 |
| 326-7289 |
8T9528 |
1T-0132 |
| 6V5393 |
5K5129 |
9X-7735 |
| 5P4076 |
6J3134 |
194-9584 |
4. FAQ
Q: Please describe the natural color and surface texture of each part without any artificial coloring or coating.
A: Abrasion-proof NBR components are deep jet black with a fine matte texture and firm elasticity. High-durability PU seals present warm golden yellow with an ultra-dense solid surface. Fly ash filled PTFE rings are light gray, with subtle tiny particle texture on the surface. Reinforced non-woven fabric guide rings are natural dark beige, featuring obvious fluffy fibrous texture.
Q: What outstanding performance does high-durability PU deliver in mining hydraulic cylinders?
A: This PU material is optimized for long-cycle heavy-load operation. When the excavator digs hard rock and loads massive ore continuously, it closely fits reciprocating parts inside the cylinder. It maintains stable sealing performance under persistent high pressure, strong friction and occasional rigid impact, and is not easy to wear or deform even after long hours of non-stop work in mining areas.
Q: What is the functional principle of fly ash filled PTFE when matched with main PU seals?
A: Fly ash filler greatly improves the overall hardness and anti-extrusion ability of PTFE. It can fully fill the narrow assembly gaps of piston grooves. When the bucket hits hard rock and creates extreme instantaneous pressure peaks, this material disperses pressure evenly and protects the thin sealing lip of PU from being squeezed, torn or permanently deformed, extending the whole sealing system’s service life.
Q: In what ways is abrasion-proof NBR superior to ordinary rubber materials?
A: Apart from standard oil resistance, this upgraded NBR adds strong anti-grit and anti-wear properties. In dry mining environments filled with rock dust and fine gravel, it will not be scratched or worn easily. It also resists long-term aging under strong sunlight and dry wind, keeping stable elasticity and sealing tightness for a long time.
Q: Where are the abrasion-proof NBR sealing parts mainly installed on the hydraulic cylinder?
A: These rubber parts are mainly assembled on stationary connection positions, including cylinder end cover flanges, hydraulic pipeline joints and fixed sealing gaskets. These areas are exposed to rock dust, hydraulic oil and dry air all day long, which can fully display the material’s excellent comprehensive performance.
Q: What practical value can reinforced non-woven fabric guide rings bring during piston movement?
A: Different from traditional woven rings, the reinforced non-woven structure has better shock absorption and uniform load distribution. It offsets the lateral force generated by uneven ore resistance, keeps the piston moving along the central axis steadily, and greatly reduces metal wear between piston and cylinder wall, making the cylinder run more smoothly under heavy mining loads.
Q: Are all sealing accessories produced strictly according to OEM original size specifications?
A: Every seal, backup ring and guide ring is manufactured in strict accordance with original factory drawings and groove dimensions. All parts achieve precise one-to-one matching, so maintenance personnel do not need to carry out any cutting, drilling or structural modification during on-site replacement.
5. Exhibition and Wearhous
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