Επισημαίνω:
Hydraulic stick cylinder seal kit
, Excavator cylinder overhaul kit
, D5 D6N XL seal kit
1. Quick Details of seal 448-4913:
| Part NO. |
448-4913 |
| Machine |
Tracked tractor |
| Size |
OEM |
| Material |
EPDM |
| Oil seal type |
SEAL KIT
|
2. 448-4913 picture:
3. Service part number :
| PART NO. |
PART NO. |
Part NO. |
| 6V6560 |
1687319 |
1293719 |
| 8T6850 |
8T-4750 |
2979545 |
| 5673714 |
2J7764 |
2H-6340 |
| 5671750 |
9J5151 |
5D-7523 |
| 567-1748 |
2225824 |
2D-6533 |
| 1410749 |
3052215 |
8M-4389 |
| 1453576 |
2074710 |
9H-3360 |
| 2314707 |
6V5326 |
6F-8146 |
| 4S5924 |
6E4240 |
3D-8422 |
| 5494308 |
5673612 |
6V-1196 |
| 5673714 |
5673611 |
5P-4889 |
4. FAQ
Q: What materials are adopted to make up all sealing components inside this repair kit?
A: The complete set is composed of four tailored materials: high-density PU for main dynamic sealing, tourmaline mineral reinforced PTFE as anti-extrusion back-up rings, weather-resistant EPDM for static sealing joints, and cotton linen blended phenolic fabric that acts as load-bearing and anti-wear guide rings for the piston.
Q: What is the natural appearance and color of each component without extra pigment or surface treatment?
A: High-density PU seals present soft eggshell white with a fine matte texture; tourmaline-filled PTFE rings are pale gray with tiny sparkling mineral particles; EPDM rubber parts are deep jet black with uniform surface; cotton linen blended fabric guide rings show natural flax brown with clear woven texture.
Q: What key sealing function does high-density PU perform inside the stick cylinder?
A: As the core dynamic sealing element, high-density PU boasts outstanding compression resilience and wear resistance. It closely fits the reciprocating piston rod, effectively locking high-pressure hydraulic fluid inside the cylinder and preventing leakage while the stick stretches and retracts repeatedly to dig soil, lift debris and adjust working posture in tight construction spaces.
Q: What is the functional design of tourmaline-filled PTFE matched with PU main seals?
A: This modified PTFE material perfectly fills the micro gaps inside piston mounting grooves. When the stick suddenly touches hard sundries or bears instant impact load during operation, it buffers sharp hydraulic pressure surges and stops the edge of PU seals from being squeezed, deformed or torn, so as to stabilize the whole sealing system.
Q: What unique advantages does EPDM have compared with common rubber materials?
A: EPDM features remarkable low-temperature flexibility, ultraviolet resistance and anti-ozone aging performance. It can keep stable sealing performance for a long time under long-term exposure to outdoor wind, sunlight and alternating cold and hot climate, and will not become hard, brittle or deformed in complex open-air working environments.
Q: Where are EPDM rubber seals mainly installed on the stick cylinder?
A: EPDM components are mainly arranged for static sealing at cylinder end cover connecting flanges and external hydraulic pipe thread joints. These positions are directly exposed to the outside environment, and EPDM can effectively block rainwater, dust and moist air from penetrating into the cylinder while preventing slow oil seepage at fixed joints.
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