07011-00090 0701100090 HNBR PU FKM Carbon Filled PTFE Multi-Material Composite Oil Seal Kit for Komatsu Wheel Loader Steering Priority Flow Valve Complete Overhaul Servicing D355A-3

1. Quick Details of  seal 07011-00090:

2. 07011-00090  parts on group :

3. 07011-00090  picture:

4. Service part number :

5. FAQ

Q: What clear color and structural visual differences allow maintenance technicians to quickly distinguish each precision sealing component inside this steering priority flow control valve oil seal kit?
A: HNBR steering priority shuttle spool and balance piston main seals are matte jet black with asymmetrical double-lip unidirectional dual-circuit dynamic sealing structure, the contact lip surface adopts ultra-fine nano mirror precision polishing without micro burrs or frequent steering-flow conversion cyclic abrasion scratches. Rounded rectangular PU steering priority flow buffer rings are pale apricot yellow with exclusive rounded rectangular shock absorption outline, which can be clearly distinguished from arched rectangular, rectangular curved and wide narrow trapezoidal PU buffer rings used on loader multi-speed shift valves, directional shift valves and bulldozer main relief valves. FKM medium thick static O-rings are dark coffee brown with thick uniform circular cross-section, no shrinkage or permanent micro deformation after long-term steering/loading alternating high-temperature oil soaking storage. Carbon-filled PTFE medium-gap anti-extrusion rings are off-white with evenly scattered tiny black carbon particles spread across the flat surface, easy to separate from light gray graphite-infused PTFE rings applied to narrow-gap miniature pilot valve assemblies. The medium-duty double-layer dust wiper ring is medium-thick black composite structure with two layers of scraping lips; the outer thick lip intercepts coarse sandstone and metal friction debris mixed in transmission oil, and the inner fine lip blocks tiny gravel abrasive sludge particles from entering the dual-circuit steering priority spool gap. Each accessory is printed with clear steering priority control valve matching dimension marks on the surface for fast sorting and matching during on-site loader transmission valve assembly.

Q: What wide temperature range and steering priority flow conversion alternating cyclic pressure hydraulic working conditions can this four-material composite oil seal kit withstand for long-term stable continuous operation?
A: This integrated full oil seal kit can steadily bear sustained long-term average dual-circuit mixed working pressure up to 500 bar, and withstand repeated instantaneous steering priority flow switch unidirectional peak impact pressure up to 575 bar without extrusion failure or lip cracking of sealing components. HNBR and PU components retain stable elastic recovery and unidirectional flow conversion cyclic sealing performance within -38°C ~ +122°C, fully adapting to sub-zero frozen quarry frequent steering-loading combined operation in winter and high-temperature continuous long-distance port heavy cargo stacking operation in summer. FKM thick O-rings can operate reliably within -26°C ~ +148°C, perfectly matching the ultra-high-temperature dual-circuit alternating-pressure transmission oil circulation state of non-stop aggregate loading construction. Carbon-filled PTFE medium-gap backup rings will not soften or deform under millions of intermittent unidirectional spool sliding friction and frequent large-range cold-hot temperature alternation, maintaining consistent anti-leakage protective performance through all seasonal bulk material loading environments.

Q: What hidden steering priority flow hydraulic circuit malfunctions and corresponding economic losses will customers encounter if they select cheap inferior oil seal kits instead of this complete multi-material composite set?
A: Low-grade inferior oil seal kits only adopt recycled low-grade ordinary NBR raw materials, without matching rounded rectangular PU steering priority flow conversion surge buffer rings and carbon-filled PTFE medium-gap anti-extrusion protective layers. After millions of frequent steering-lifting compound cycles and long-term sand-mud mixed corrosion, the double-lip steering priority spool sealing lip will unilaterally fatigue and wear thin slowly, triggering internal steering flow bypass and continuous slow one-way external oil leakage of the steering priority valve assembly. The wheel loader will present dull, delayed steering response when turning while lifting full bucket, insufficient priority flow to steering circuit leading to large turning radius, unbalanced power between steering and working hydraulic circuits, unstable boom lifting speed during cornering and faint unilateral hydraulic flow vibration noise every time the operator turns the steering wheel under load. Worn rubber and plastic micro debris will flow into the whole transmission hydraulic circuit, scratch the precision polished steering priority shuttle spool and valve body inner bore, requiring costly full replacement of integral metal steering priority valve core components, full transmission oil change and all transmission filter element renewal. Meanwhile, persistent slow one-way oil seepage increases daily high-cost hydraulic oil consumption costs, and prolonged equipment shutdown will delay overall quarry and port loading progress, bringing extra labor rental and equipment idle loss expenses for customers, and insensitive steering under heavy load will raise collision risks at narrow stockpile yards.

Q: What standardized wheel loader steering priority flow system installation operation specifications and strictly prohibited operations should maintenance staff strictly follow to maximize the full service life of this 07011-00090 steering priority control valve oil seal kit?
A: First, use medium-fine water sandpaper to polish the steering priority shuttle spool outer installation groove, valve body inner bore and static sealing mounting flat surfaces, thoroughly clear old seal residues, metal micro burrs, transmission sand sludge and mixed metal friction abrasive impurities. Second, evenly coat all sealing components with brand-new clean anti-wear transmission hydraulic oil for lubrication; thick high-viscosity grease mixed with metal iron filings is strictly forbidden, as hard sand and metal particles will scratch the HNBR double-lip unidirectional dual-circuit sealing lip during millions of frequent steering-flow conversion spool sliding movements under alternating mixed circuit pressure. Third, install every steering priority shuttle spool seal in the designated fixed orientation: the thicker priority steering high-pressure sealing lip side must face the steering flow oil cavity side, reversed installation will completely lose preferential steering flow supply function and cause continuous slow oil seepage after assembly completion. Fourth, lay the carbon-filled PTFE medium-gap backup ring completely flat without bending, folding or micro warping before fitting the main HNBR steering priority shuttle spool seal into the valve installation groove. Fifth, after finishing all seal assembly, manually slide the steering priority shuttle spool back and forth hundreds of steering-lifting flow conversion cycles at low test pressure to inspect all sealing positions for oil leakage before reinstalling the steering priority control valve onto the wheel loader main transmission manifold and putting the machine back into full-load bulk material loading production.

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