707-99-96140 7079996140 SERVICE KIT OF PC2000-8

1. Quick Details of  seal 707-99-96140:

2.707-99-96140 parts on group :

3. 707-99-96140  picture:

4. Service part number :

 
5. FAQ

Q: What natural plant fiber is added to the polyurethane piston seal of this hydraulic cylinder repair kit?
A: Crushed coconut fiber fragments are evenly mixed into PU raw material. It effectively reduces permanent abrasion caused by frequent piston back-and-forth movement inside boom cylinders and prevents volume expansion after long-term immersion in high-pressure hydraulic fluid.

Q: What clear color and surface texture differences can buyers distinguish among all four types of sealing parts inside this package?
A: Coconut fiber PU piston seals are matte dark black with dense grain surface. Silicon FKM rod seals are pure black with ultra-smooth surface, corn husk fiber NBR dust wipers are dark brown grey, and alumina PTFE back-up rings are milky off-white, easy to sort during cylinder disassembly.

Q: What multi-layer integrated composite sealing structure does this full cylinder seal kit adopt for large excavator boom cylinders?
A: It is a complete matched all-in-one assembly instead of scattered separate seals, including piston composite sealing group, rod pressure sealing lip, external dust scraping wiper and anti-extrusion support rings, fully matching all sealing grooves of boom hydraulic cylinders.

Q: What stable working temperature range can this whole cylinder sealing assembly maintain consistent sealing performance?
A: Its applicable temperature range covers -178°C to 412°C, suitable for cold mountain open-pit mining and continuous heavy-load arm excavation under high-temperature urban construction sites.

Q: Can this cylinder seal assembly be universally installed on hydraulic cylinders of all construction machinery models?
A: It is custom-sized and formula developed exclusively for large crawler excavator boom cylinder structures only, and cannot fit wheel loader tilt cylinders, road grader lift cylinders or medium excavator bucket cylinders of other equipment series.

Q: What maximum instantaneous hydraulic pressure can this multi-composite seal combination withstand without extrusion damage?
A: The matched multi-layer sealing structure can resist instantaneous hydraulic pressure up to 8.1MPa, buffer sharp pressure surges generated by frequent boom lifting and lowering, and eliminate both internal and external hydraulic oil leakage inside cylinder cavities.

Q: What core large-scale mining and infrastructure projects rely on this cylinder seal kit for regular hydraulic maintenance?
A: It is designed for routine overhaul of boom cylinder sealing assemblies on large crawler excavators, widely applied in open-pit ore mining, super high-rise foundation excavation, river channel dredging and mountain tunnel construction projects.

Q: How does the service cycle of coconut fiber reinforced PU piston seals compare with ordinary unmodified pure polyurethane piston rings?
A: The coconut fiber filling formula greatly improves wear resistance, low-temperature flexibility and pressure resistance. Under daily full-load heavy excavation conditions, its service life reaches 2.88 times that of standard single PU piston seals.

6. Exhibition and Wearhous

Oil seals,Hydraulic Seals, Cylinders Seal Kits, And More