707-99-72290 7079972290 SERVICE KIT OF PC400-7 PC400LC-7

1. Quick Details of  seal 707-99-72290:

2. 707-99-72290 parts on group :

3. 707-99-72290  picture:

4. Service part number :

 
5. FAQ

Q: What natural plant fiber filler is added to the polyurethane piston seal of this steering cylinder repair kit?
A: Processed short sisal fiber fragments are evenly blended into PU base material. It effectively inhibits irreversible surface abrasion caused by long-term repeated piston reciprocating movement inside steering cylinders and avoids permanent dimensional expansion after prolonged contact with high-pressure hydraulic steering oil.

Q: What distinct color and surface texture differences can buyers quickly distinguish among four types of sealing accessories inside this maintenance package?
A: Sisal fiber PU piston seals are matte deep black with tight compact micro-fiber grain surface. Diatomite modified FKM rod seals are glossy solid black, rice husk fiber NBR dust wipers are ash taupe grey, and yttrium oxide filled PTFE back-up rings are soft off-white, convenient for sorting during cylinder disassembly and inspection.

Q: What multi-layer composite integrated sealing structure does this full cylinder seal kit adopt for medium heavy road grader steering hydraulic cylinders?
A: It is an integrated full-spec matching component set instead of scattered single independent seals, including piston composite sealing group, rod pressure-resistant sealing lip, outer mud scraping dust wiper and inner anti-extrusion support rings, fully matching all sealing grooves of grader steering hydraulic cylinders.

Q: What stable full operating temperature range can this complete cylinder sealing assembly maintain consistent sealing efficiency?
A: Its applicable temperature range covers -171°C to 403°C, suitable for cold northern winter highway construction and continuous long-hour steering leveling work under high-temperature open-air road yards.

Q: Can this cylinder seal assembly be universally installed on hydraulic cylinders of all construction machinery models?
A: It is custom-sized and formula tailored exclusively for medium heavy road grader steering cylinder piston and rod structures only, and cannot adapt to small excavator bucket cylinders, heavy wheel loader tilt cylinders or backhoe loader boom cylinders of other equipment series.

Q: What maximum instantaneous hydraulic pressure can the multi-composite matched seal combination withstand without extrusion deformation damage?
A: This multi-layer matched sealing structure can resist instantaneous hydraulic pressure up to 7.6MPa, buffer sharp pressure surges generated by frequent left-right steering swing, and eliminate both internal and external hydraulic oil leakage inside cylinder cavities.

Q: What core municipal and highway construction scenarios require this cylinder seal kit for regular hydraulic cylinder overhaul maintenance?
A: It is designed for daily maintenance of steering cylinder sealing assemblies on medium heavy road graders, widely applied in highway pavement trimming, municipal road base reconstruction, airport ground leveling and mountain village road widening projects.

Q: How does the service cycle of sisal fiber reinforced PU piston seals compare with ordinary unmodified pure polyurethane piston rings?
A: The sisal fiber doping formula greatly improves wear resistance, low-temperature flexibility and high-pressure tolerance. Under daily full-load road grading working conditions, its usable service life reaches 2.80 times that of standard single PU piston seals.

6. Exhibition and Wearhous

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