721-98-07300 7219807300 Arm Hydraulic Cylinder Full Seal Repair Kit for Excavator Stick Cylinder Rebuild & Heavy‑Duty Digging Site Hydraulic Maintenance

1. Quick Details of  seal 721-98-07300:

2.  721-98-07300 picture:

3. Service part number :

 
4. FAQ

Q: I’m looking for overhaul seal spare parts for the stick cylinder of heavy‑duty excavator, could you confirm which part number I should select for purchase?
A: The exact matching part number is 721‑98‑07300, this complete arm cylinder seal kit is specially produced for heavy‑duty excavator stick cylinder field servicing and full hydraulic cylinder rebuild assignments.

Q: Which hydraulic cylinder assembly does part number 721‑98‑07300 fit on excavator equipment?
A: 721‑98‑07300 applies to the arm hydraulic cylinder, which performs extension and retraction motions of the stick arm during deep‑trench digging and heavy‑rock excavation construction tasks.

Q: What raw materials make up each sealing component inside this repair kit?
A: It adopts NBR for oil‑resistant o‑rings, PU for high‑wear resistant primary rod sealing lips, PTFE anti‑extrusion backup rings and HNBR for improved heat‑aging resistant auxiliary sealing components.

Q: What sealing parts are included inside this full repair kit?
A: It contains piston seals, rod seals, buffer rings, PTFE backup rings, dust wiper seals and various sizes of supporting O‑rings for cylinder reassembly.

Q: Where is this cylinder seal kit mounted on mini excavator?
A: These sealing assemblies are installed inside cylinder barrel and cylinder head, surrounding piston and reciprocating bucket cylinder rod.

Q: Can this product prevent hydraulic oil leakage effectively?
A: The precise size design effectively reduces internal leakage and external oil seepage.

Q: What construction scenarios often require this arm cylinder seal kit for regular maintenance?
A: It is widely used for maintaining mini excavators working on villa foundation projects, landscape engineering, pipeline trenching and rural road reconstruction.

5. Exhibition and Wearhous

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