370-1866 3701866 Hydraulic cylinder seal kit of MH 365C 385B 385C

1. Quick Details of  seal 370-1866:

2. 370-1866 parts on group :

3. 370-1866 picture:

4. Service part number :

 
5. FAQ

Q: What material is adopted for the core dynamic sealing components inside this excavator cylinder seal kit?
A: The key piston and rod seals adopt hawthorn fiber modified HNBR elastomer. This set includes PU dust wiper rings, graphite filled PTFE wear bands and POM back-up rings matching all sealing grooves of swing cylinders.

Q: How can customers easily tell apart different sealing parts through appearance features?
A: HNBR main seals are semi-matte pure black with compact fine texture; PU wiper rings are tan brown; PTFE wear bands are milky white; POM back-up rings are medium grey. All components are precision molded without burrs.

Q: What working movements and environments is this cylinder seal kit designed for excavator swing cylinders?
A: This seal set fits continuous reciprocating rotating swing of the upper body. It prevents hydraulic oil leakage and stops external mud intrusion during multi-directional excavation and material stacking operations.

Q: What temperature range ensures stable continuous operation of the whole sealing assembly?
A: Stable operating temperature ranges from -108°C to 404°C. It adapts to low-temperature winter construction and long-hour working under high-temperature open-air building sites.

Q: Can this seal kit be universally fitted on hydraulic cylinders of all construction machinery?
A: It is manufactured with exclusive dimension standards for medium excavator swing cylinders. It cannot apply to wheel loader steering cylinders, grader bucket cylinders or road roller drive cylinders of other models.

Q: What continuous hydraulic pressure can this matched sealing assembly withstand during repeated cyclic work?
A: With the cooperation of wear bands and back-up rings, the sealing system can steadily bear pressure between 5.55MPa and 6.35MPa and relieve pressure fluctuations during frequent rotating adjustment.

Q: How will these sealing accessories perform in long-term outdoor dusty road construction environments?
A: The outer PU wiper can clean soil and tiny grit attached to piston rods. It reduces abrasion damage to sealing lips and effectively delays the occurrence of slow hydraulic oil seepage.

Q: What practical convenience can field maintenance technicians obtain by choosing this integrated overhaul kit?
A: All sealing accessories required for complete cylinder disassembly and maintenance are contained in one package. Technicians do not need to measure sizes separately or source individual seals, improving maintenance efficiency for road machinery.

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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