07010-00140 0701000140 HNBR PU FKM Graphite Infused PTFE Multi-Material Composite Oil Seal Kit for Bulldozer Hydraulic Sequence Priority Valve Complete Servicing

1. Quick Details of  seal 07010-00140:

2. 07010-00140  picture:

3. Service part number :

4. FAQ

Q: What core performance upgrades does the four-material composite collocation bring to bulldozer blade lift cylinder sealing compared with ordinary single NBR seal kits?
A: Bulldozer blade lift cylinders bear extreme heavy load impact, frequent reciprocating friction and long-term mud-water mixed erosion all year round during full-load soil pushing and rock leveling operations. HNBR main seals possess far superior low-temperature flexibility and hydraulic oil aging resistance than conventional ordinary NBR rubber; they will not harden, crack or lose radial pre-tightening elasticity under cold plateau winter construction environments with subzero temperatures. Wedge-shaped PU buffer rings absorb sudden hydraulic pressure surges generated by instant blade lifting load changes, avoiding direct tearing damage to thin main sealing lips. FKM static O-rings maintain stable sealing tightness under long-hour high-temperature hydraulic oil circulation during uninterrupted all-day pushing work. Carbon-filled PTFE backup rings deliver stronger wear resistance and anti-extrusion capacity than unfilled pure PTFE, effectively preventing the main seal from being squeezed into tiny gaps between piston and cylinder barrel under instantaneous peak pressure. The four materials form a multi-layer interlocking heavy-load protection system, lifting the overall service life of the seal kit by over 44% compared with traditional single-rubber seal kits.
Q: What distinct color and structural visual differences allow maintenance technicians to quickly identify each component inside this blade lift cylinder seal kit?
A: HNBR rod and piston main seals are matte deep black with triple-lip integrated sealing structure, the contact lip surface undergoes precise mirror polishing without burrs or micro scratches. Wedge-shaped PU buffer rings are light apricot yellow with exclusive triangular wedge shock absorption outline, visually distinguishable from arc, oval and circular buffer rings used on valves, pumps and auxiliary cylinders. FKM static O-rings are dark coffee brown with uniform round cross-section, no shrinkage or permanent deformation after long-term warehouse storage. Carbon-filled PTFE anti-extrusion rings are off-white with evenly scattered tiny black carbon particles on the surface, easy to tell apart from light gray graphite-filled PTFE rings for hydraulic valve assemblies. The heavy-duty dust wiper is thick black with dual internal and external scraping lips; the outer thick lip blocks large mud clumps and gravel, while the inner fine lip filters tiny abrasive dust particles. Each accessory is printed with clear blade lift cylinder matching size marks on the surface for fast sorting and matching during on-site assembly.
Q: What wide temperature range and extreme heavy hydraulic pressure working conditions can this four-material composite seal kit sustain for long-term stable continuous operation?
A: This integrated oil seal kit can continuously bear stable long-term working pressure up to 410 bar, and withstand instantaneous peak impact pressure up to 465 bar without extrusion failure of sealing components. HNBR and PU accessories retain stable elastic recovery and sealing performance within -38°C ~ +122°C, fully adapting to low-temperature frozen mountain construction in winter. FKM O-rings can operate normally within -26°C ~ +145°C, perfectly matching the high-temperature hydraulic oil circulation state of non-stop full-load earthmoving in summer. Carbon-filled PTFE backup rings will not soften or deform under heavy-load reciprocating friction and high temperature, maintaining consistent anti-leakage protection performance all year round regardless of seasonal environment changes.

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