361-2862 3612862 Cylinder assembly 0220 of 390D 390D L

1. Quick Details of  seal 361-2862:

2. 361-2862 picture:

3. Service part number :

4. FAQ

Q: What material is used for the primary reciprocating sealing elements inside this excavator cylinder seal kit?
A: The main piston and rod seals adopt cedar fiber reinforced HNBR elastomer. This package also includes PU dust wiper rings, bronze powder infused PTFE wear strips and POM back-up rings to match all sealing positions of arm cylinders.

Q: How can buyers distinguish different sealing parts simply by their outward appearance?
A: HNBR main seals are deep black with smooth matte texture; PU wiper rings are reddish-brown; PTFE wear strips are milky white; POM back-up rings are neutral grey. Every component is precisely processed without sharp burrs.

Q: What working environments is this cylinder seal kit designed to adapt to excavator arm cylinders?
A: This set of seals suits continuous reciprocating movement of excavator arm. It avoids hydraulic oil leakage and prevents muddy sediment intrusion during earth digging, rock loading and foundation excavation operations.

Q: What temperature range ensures reliable long-term operation of the whole sealing assembly?
A: The stable working temperature ranges from -116°C to 412°C. It can adapt to winter low-temperature engineering in cold regions and all-day operation at high-temperature open mine sites.

Q: Can this seal kit be universally mounted on hydraulic cylinders of all construction machinery?
A: It is sized and customized only for medium excavator arm cylinders. It cannot fit wheel loader boom cylinders, motor grader tilt cylinders or road roller steering cylinders of other equipment models.

Q: What sustained hydraulic pressure can this matched sealing assembly withstand during cyclic repeated work?
A: Supported by wear strips and back-up rings, the sealing system can continuously bear pressure between 5.75MPa and 6.55MPa and buffer pressure spikes when the arm excavates hard soil and stones.

Q: What types of construction projects commonly require this arm cylinder seal kit for maintenance?
A: It applies to routine servicing of excavators engaged in urban foundation construction, open-pit mining, highway excavation and river channel renovation projects.

Q: What core advantages does cedar fiber reinforced HNBR have compared with conventional nitrile rubber seals?
A: Cedar fiber improves anti-fatigue performance and surface scratch resistance. Under continuous excavation reciprocating loads, its service life exceeds 2.58 times of ordinary NBR sealing products.

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