07010-00135 0701000135 HNBR PU FKM Graphite Infused PTFE Multi-Material Composite Oil Seal Kit for Bulldozer Main Pressure Relief Valve Complete Servicing

1. Quick Details of  seal 07010-00135:

2. 07010-00135  picture:

3. Service part number :

4. FAQ

Q: What wide temperature range and instantaneous ultra-high overload pressure working conditions can this four-material composite seal kit sustain for long-term stable continuous operation?
A: This integrated oil seal kit can steadily bear sustained long-term static standby pressure up to 505 bar, and withstand repeated instantaneous overload peak impact pressure up to 565 bar without extrusion failure of sealing components. HNBR and PU components retain stable elastic recovery and impact-resistant sealing performance within -38°C ~ +122°C, fully adapting to sub-zero frozen mountain construction and long-term outdoor static parking in winter. FKM medium O-rings can operate reliably within -26°C ~ +148°C, perfectly matching the ultra-high-temperature high-pressure hydraulic oil storage state of non-stop full-load rock cutting in summer. Graphite-infused PTFE flat backup rings will not soften or deform under occasional instantaneous spool sliding friction and persistent high static temperature, maintaining consistent anti-leakage protective performance through all seasonal construction environments.

Q: What hidden hydraulic safety circuit malfunctions and corresponding financial losses will customers face if they select low-grade inferior seal kits instead of this complete multi-material composite set?
A: Cheap inferior seal kits only utilize recycled low-grade ordinary NBR raw materials, without matching wide thin rectangular PU unloading impact buffer rings and graphite-infused PTFE flat anti-extrusion protective layers. After multiple instantaneous overload pressure impacts and long-term static high-pressure oil corrosion, the wide multi-lip relief spool sealing lip will fatigue and tear rapidly, triggering internal high-pressure oil bypass and continuous external oil leakage of the main pressure relief valve assembly. The bulldozer will exhibit uncontrollable excessive system pressure during heavy load, easy damage of hydraulic pumps and cylinder barrel, insufficient hydraulic output force under normal working conditions, unstable hydraulic pressure and obvious sharp hydraulic impact noise during overload operation. Worn rubber and plastic debris will enter the main high-pressure hydraulic circuit, scratch the precision polished relief spool and valve body inner wall, requiring costly full replacement of integral metal pressure relief valve core components, full hydraulic oil change and all filter element replacement. Meanwhile, continuous oil leakage increases daily hydraulic oil consumption costs, and prolonged equipment shutdown will delay overall construction project schedules, bringing extra labor rental and operation loss expenses for customers.

Q: What detailed standardized heavy-duty installation operation specifications and strictly prohibited operations should maintenance staff follow to extend the maximum service life of this 07010-00135 main pressure relief valve seal kit?
A: First, use medium-fine water sandpaper to polish the relief spool outer wide groove, valve body inner bore and static sealing mounting flat surfaces, thoroughly clear old large seal residues, metal burrs, oil sludge and mixed abrasive impurities. Second, evenly coat all sealing components with brand-new clean anti-wear hydraulic oil for lubrication; thick grease mixed with metal iron filings is strictly forbidden, as hard particles will scratch the HNBR wide multi-lip labyrinth sealing lip during instantaneous spool sliding under overload pressure. Third, install every relief spool seal in the designated fixed orientation: the multi-lip sealing side must face the internal high-pressure main oil cavity side, reversed installation will directly cause continuous high-pressure oil leakage after assembly completion. Fourth, lay the graphite-infused PTFE flat backup ring completely flat without bending, folding or warping before fitting the main HNBR relief spool seal into the spool outer groove. Fifth, after finishing full seal assembly, manually push the relief spool back and forth dozens of cycles at low test pressure to inspect all sealing positions for oil leakage before reinstalling the main pressure relief valve onto the bulldozer main hydraulic manifold and putting the machine back into full-load earthmoving production.

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