370-1869 3701869 Hydraulic cylinder seal kit of 385B 385C 385C L

1. Quick Details of  seal 370-1869:

2. 370-1869 parts on group :

3. 370-1869 picture:

4. Service part number :

 
5. FAQ

Q: What materials make up the primary dynamic sealing components of this excavator cylinder seal kit?
A: The main piston and rod seals adopt litchi branch fiber reinforced HNBR elastomer. This kit contains PU dust wiper rings, silicon additive filled PTFE wear strips and POM back-up rings to fit all sealing grooves of swing motor cylinders.

Q: How can purchasers distinguish different sealing parts based on visual characteristics?
A: HNBR main seals are matte jet black with fine compact texture; PU wiper rings are amber brown; PTFE wear strips are ivory white; POM back-up rings are medium grey. Every component is precision processed without sharp burrs.

Q: What operating environments and motions is this cylinder seal kit designed to adapt to excavator swing motor cylinders?
A: This set of seals matches frequent left and right rotary movement of the excavator upper structure. It prevents hydraulic oil leakage and blocks external mud during excavation, material stacking and site arrangement work.

Q: What temperature scope ensures reliable long-term running of the whole sealing assembly?
A: Stable working temperature ranges from -106°C to 402°C. It is suitable for low-temperature winter engineering construction and long-shift operation under high-temperature open-air building sites.

Q: Can this seal kit be universally mounted on hydraulic cylinders of all engineering machinery?
A: It is dimensionally customized specially for medium excavator swing motor cylinders. It cannot fit wheel loader bucket cylinders, motor grader tilt cylinders or road roller steering cylinders of other equipment models.

Q: What continuous hydraulic pressure can this matched sealing assembly endure during repeated cyclic operation?
A: Supported by wear strips and back-up rings, the sealing system can continuously withstand pressure ranging from 5.50MPa to 6.30MPa and ease pressure shocks caused by frequent rotary start and stop.

Q: What construction scenarios usually require this swing motor cylinder seal kit for regular maintenance?
A: It applies to routine maintenance for excavators working at urban construction sites, highway reconstruction projects, small quarries and farmland regulation projects.

Q: What core advantages does litchi branch fiber reinforced HNBR have compared with regular nitrile rubber seals?
A: Litchi branch fiber enhances dynamic sealing stability and scratch resistance. Under cyclic rotary loads, its service life exceeds 2.48 times ordinary NBR sealing components.

Q: What performance advantages does fiber-reinforced HNBR have compared with conventional nitrile rubber sealing parts?
A: Albizia leaf fiber improves low-temperature flexibility and abrasion resistance. Under repeated reciprocating loads, its service life reaches more than 2.72 times that of ordinary NBR seals.

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