Επισημαίνω:
Hydraulic Boom Cylinder Seal Kit
, 420F 430F Articulated Hauler Seal Kit
, 428E Overhaul Seal Kit with Warranty
1. Quick Details of seal 521-2973:
| Part NO. |
521-2973 |
| Machine |
Backhoe loader |
| Size |
OEM |
| Material |
PU |
| Oil seal type |
SEAL KIT
|
2. 521-2973 parts on group :
| NO. |
PART NO. |
PRAT NAME |
QTY |
| 1 |
340-9310 |
O-RING |
1 |
| 2 |
338-2443 |
SEAL |
1 |
| 3 |
323-2466 |
SEAL |
1 |
| 4 |
340-9308 |
O-RING |
1 |
| 5 |
340-6272 |
SEAL |
2 |
| 6 |
478-4174 |
SEAL |
1 |
| 7 |
161-7145 |
SEAL |
1 |
3. 521-2973 picture:
4. Service part number :
| PART NO. |
PART NO. |
Part NO. |
| 8M8110 |
4J7533 |
8275517 |
| 4K4376 |
7J0204 |
5J8275 |
| 3J0375 |
3J7354 |
6J6553 |
| 1N9177 |
1J9671 |
8325525 |
| 6N9312 |
3J1907 |
5J8325 |
| 4S7805 |
3K0360 |
6J7167 |
| 3F8638 |
2M9780 |
8200506 |
| 9M4849 |
3D2824 |
5J8200 |
| 8S8858 |
4K1388 |
6J6917 |
| 5M2667 |
7M8485 |
2J1411 |
| 1S0668 |
2R0098 |
3J-1907 |
| 325-3780 |
095-0598 |
2K8198 |
5. FAQ
Q: What four distinct raw materials compose all sealing accessories contained inside this maintenance kit?
A: The full repair assortment consists of high tensile injection molded PU, feldspar mineral powder compound modified PTFE, high heat resistant AEM acrylic rubber and ramie woven substrate phenolic resin saturated anti-friction piston guiding fabric.
Q: What natural primitive color does each sealing component feature without artificially blended pigment or outer coating paint?
A: Injection molded PU dynamic primary seals are soft milky white, feldspar-filled PTFE backup rings are uniform stone gray, AEM static rubber seals are pale wheat beige, ramie phenolic fabric wear rings are rustic reddish brown.
Q: What core sealing obligation does injection molded PU perform inside the hauler’s tipping hydraulic cylinder?
A: As the core reciprocating sealing component, injection PU depends on steady elastic rebound performance to lock high-pressure hydraulic fluid inside cylinder inner cavity and prevent medium leakage when tipping boom hoists fully loaded cargo bed upward and retracts downwards repeatedly on uneven bumpy mine access roads.
Q: What is the core design logic behind configuring feldspar-filled PTFE as auxiliary backup ring matched with main PU seal?
A: It fills micro interstitial clearances within piston mounting grooves and protects PU sealing lip from being extruded and torn by abrupt hydraulic pressure spikes caused by sudden cargo gravity shift while the hauler crosses rugged undulating mine terrain.
Q: What outstanding inherent advantages make AEM rubber surpass conventional regular NBR rubber grades?
A: AEM boasts excellent long-term thermal oxidation and oil deterioration resistance, retaining stable sealing tightness after prolonged immersion in thermally degraded high-temperature hydraulic oil inside closed cylinder housing under uninterrupted round-the-clock mine transportation operation.
Q: At which specific fixed stationary cylinder positions are AEM rubber sealing parts arranged for installation?
A: AEM fittings are mainly mounted for static sealing on high-temperature cylinder end cap flange surfaces and threaded connector gaps of main high-pressure hydraulic pipelines exposed to continuous engine heat radiation and floating mine dust.
Q: What practical wear-reducing and supporting effect can ramie base phenolic impregnated fabric wear ring bring to reciprocating piston movement?
A: It bears partial lateral eccentric load generated from unbalanced payload weight, corrects slight piston radial offset during boom telescopic travel and effectively cuts down long-term abrasive scratching between piston outer perimeter and inner cylinder barrel wall.
6. Exhibition and Wearhous
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