Destacar:
CAT excavator cylinder seal assembly
, heavy duty cylinder seal kit
, M315D M316D excavator seal kit
1. Quick Details of seal 155-8421:
| Part NO. |
155-8421 |
| Machine |
wheeled excavator |
| Size |
OEM |
| Material |
PU |
| Oil seal type |
SEAL KIT
|
2. 155-8421 picture:
3. Service part number :
| PART NO. |
PART NO. |
Part NO. |
| 4J-0520 |
3D-2824 |
9X7289 |
| 334-3562 |
5K-9090 |
229-5092 |
| 061-8639 |
8T-6404 |
158-8979 |
| 136-2942 |
6V5326 |
4F7389 |
| 095-1714 |
2H3934 |
5K2595 |
| 2L2777 |
5F3106 |
1359044 |
| 5P8068 |
8T7000 |
295-9695 |
| 6V5134 |
7J6285 |
360-5603 |
| 061-8561 |
1124717 |
193-2200 |
| 8J4351 |
6V5586 |
3215628 |
| 6D-0692 |
2080926 |
2D6392 |
| 161-9835 |
5P5874 |
3511768 |
4. FAQ
Q: Please describe the natural color and surface texture of each sealing component.
A: Reinforced nitrile rubber presents matte jet black with uniform fine texture. Cast polyurethane seals show warm light amber color with dense and solid surface. Talc-filled PTFE rings are off-white with subtle fine powder texture. Multi-strand fabric guide rings are dark tan brown, with distinct woven lines visible on the surface.
Q: What is the main working principle and sealing function of cast polyurethane?
A: As the core dynamic sealing unit, cast polyurethane combines excellent elasticity and anti-tear performance. When the excavator carries out continuous digging, lifting and discharging actions, it closely fits the reciprocating piston and rod. It can firmly lock high-pressure hydraulic fluid inside the cylinder chamber and avoid fluid leakage under long-duration alternating pressure and mechanical movement.
Q: Why is talc-filled PTFE matched to work with polyurethane main seals?
A: Talc filler improves the rigidity and pressure resistance of pure PTFE. It can fully fill the tiny assembly gaps in piston grooves. Once the bucket strikes hard rock or compacted soil and triggers instantaneous hydraulic pressure surges, this material can disperse extra pressure effectively and prevent the lip of polyurethane seals from being squeezed, deformed or cracked, extending the overall service life of the sealing system.
Q: What are the prominent advantages of reinforced nitrile rubber compared with ordinary rubber?
A: This upgraded nitrile rubber possesses superior long-term oil resistance and weather aging resistance. After being immersed in hydraulic fluid for years or exposed to outdoor wind, rain and sunlight all year round, it can still maintain stable elasticity and sealing performance, and will not harden, shrink or lose tightness easily.
Q: Where are the reinforced nitrile rubber seals mainly installed on the hydraulic cylinder?
A: These rubber parts are mainly assembled on static connection positions, such as cylinder end cover flanges, pipe joint threads and fixed oil port gaskets. These areas are exposed to hydraulic oil and external harsh environment for a long time, which can give full play to the material’s excellent comprehensive performance.
Q: What role does the multi-strand fabric phenolic guide ring play during piston movement?
A: This guide ring can bear the lateral deflection force generated by unbalanced digging resistance. It calibrates the running track of the piston in real time, keeps the piston moving along the central axis steadily, and greatly reduces direct friction between metal parts, thus slowing down the wear of piston and cylinder inner wall.
Q: Do all sealing parts comply with the original OEM dimensional standards?
A: Every component is produced strictly in accordance with the original factory technical parameters and groove sizes. All parts realize one-to-one matching with the original equipment, and workers do not need to carry out any structural transformation on the cylinder during replacement.
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