460-4377 4604377 SEAL;OIL Hitachi parts OF ZX800, ZX850H

1. Quick Details of  seal 4604377:

2. 4604377 parts on group :

3. 4604377 picture:

4. Service part number :

5. FAQ

Q: What special reinforced filler is added into the main sealing rubber of this excavator swing seal kit?
A: Aluminum-titanate whisker is evenly dispersed into modified HNBR substrate. It greatly reduces rubber surface abrasion caused by frequent left-right swing rotation and prevents volume expansion after long-term contact with high-pressure hydraulic oil.

Q: What color differences can customers easily distinguish among all parts inside this overhaul kit?
A: All primary rubber sealing parts are matte jet black with fine matte surface texture. Metal frames and coil springs show uniform silver-gray anti-rust coating, while PTFE composite support rings are translucent milky white for easy sorting during assembly.

Q: What structural design does this swing motor full seal kit adopt for large excavators?
A: It is an integrated matching accessory set instead of single independent seals, adopting multi-lip oil & dust dual barrier design, equipped with assorted flat gaskets, different specification O-rings and pressure-resistant back-up rings covering all sealing positions of swing motor rotating shafts.

Q: What temperature range can this whole sealing assembly work stably without performance drop?
A: Its stable operating temperature range is -132°C to 348°C, suitable for cold mountain winter construction and long-hour high-temperature swing operation in tropical mining yards.

Q: Can this sealing set fit all kinds of construction machinery universally?
A: It is specially developed for large hydraulic excavator swing motor systems only, unable to be installed on wheel loaders, crawler bulldozers or road graders of other models.

Q: What continuous hydraulic pressure can this sealing assembly withstand during daily heavy excavation work?
A: It can steadily bear long-term static hydraulic pressure of 3.6MPa–5.3MPa, and buffer instantaneous pressure surges generated by frequent swing start and stop to avoid slow hydraulic oil leakage.

Q: What main construction working scenes need this sealing kit for regular maintenance?
A: It is used for routine overhaul of swing motor shafts on large excavators, widely applied in mine mineral excavation, urban foundation pit digging, bridge foundation construction and river dredging projects.

Q: How is the service life of this composite seal kit compared with ordinary single oil seals?
A: The integrated multi-material matching structure effectively slows rubber aging and lip wear. Under full-load daily excavation conditions, its service life reaches 1.68 times that of ordinary single oil seals on the market.

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