721-98-00370 7219800370 Complete Boom Hydraulic Cylinder Seal Repair Kit for Excavator Main Boom Cylinder Overhaul & On‑Site Maintenance

1. Quick Details of  seal 721-98-00370:

2.  721-98-00370 picture:

3. Service part number :

 
4. FAQ

Q: I am going to service the boom cylinder for my excavator, which seal assembly should I purchase?
A: The correct part number you require is 721‑98‑00370, this full boom cylinder seal kit is specially manufactured for excavator main boom cylinder overhaul and field maintenance jobs.

Q: Which hydraulic cylinder assembly does part number 721‑98‑00370 match on the excavator equipment?
A: 721‑98‑00370 is applied to the main boom hydraulic cylinder that undertakes lifting and lowering motions of the excavator front boom arm during digging operations.

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‑pressure resistant main rod seals, PTFE extrusion‑resistant backup rings and POM rigid anti‑abrasion guide wear rings.

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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