07018-10904 0701810904 RING,SEAL OF D41E-3A D41A-3

1. Quick Details of  seal 07018-10904:

2. 07018-10904 parts on group :

3.  07018-10904 picture:

4. Service part number :

5. FAQ

Q: Which large road motor grader model matches this piston seal ring 07018-10904, and what bidirectional hydraulic pressure blocking sealing capacity can this single narrow split bronze piston seal deliver inside the auxiliary clutch hydraulic piston chamber?
A: This genuine OEM piston seal ring marked 07018-10904 is exclusively customized for Komatsu GD675-6 heavy-duty highway motor graders, installed on the auxiliary clutch pressure control piston inside the secondary transmission hydraulic assembly. The auxiliary clutch piston bears continuous low-frequency reciprocating compression strokes under long-term stable medium hydraulic pressure during expressway widening paving, airport auxiliary runway trimming and large municipal road foundation compaction supporting operations. It withstands irregular instantaneous pressure spikes caused by broken asphalt, crushed stone and hard subgrade rock uneven ground bumps, long-term continuous erosion of medium-temperature anti-wear transmission hydraulic oil mixed with tiny metal auxiliary clutch friction plate abrasive dust, plus year-round outdoor extreme temperature swings between northern alpine freezing winter road construction sites and non-stop full-load high-temperature summer pavement finishing work. This split tin bronze alloy piston seal assembly integrates precision sand-cast compact tin bronze main sealing ring paired with ultra-thin HNBR elastic backing liner, realizing stable bidirectional hydraulic oil pressure isolation inside the auxiliary clutch piston cavity. It effectively stops high-pressure clutch fluid cross leakage on both sides of the piston to prevent auxiliary clutch disengagement failure, incomplete gear combination and obvious loss of grader auxiliary driving power; the unique single narrow split opening design achieves automatic radial dimensional compensation to offset long-term piston groove inner wall uniform wear, while the matched HNBR elastic liner provides continuous uniform outward supporting tension to fill micro clearances between the ring and groove, avoiding bronze ring extrusion bending deformation under sudden peak pressure impact. All parts adopt exclusive oversized dimensional standards customized for GD675-6 auxiliary clutch pistons and cannot be interchanged with seal rings of medium graders, bulldozers or wheel loaders, suitable for full auxiliary clutch disassembly overhaul at professional large road machinery repair workshops and dedicated motor grader after-sales service centers, drastically cutting unexpected long-term equipment downtime caused by internal auxiliary clutch hydraulic cross leakage faults.

Q: What exclusive metal-rubber composite sealing comprehensive advantages does this tin bronze alloy piston seal ring possess compared with three-layer filled PTFE composite piston seals or one-piece integral rubber piston seals supplied by aftermarket vendors for GD675-6 large motor grader auxiliary clutches?
A: The auxiliary clutch piston of GD675-6 large motor graders reciprocates tens of thousands of times weekly under sustained 22–30Mpa medium hydraulic pressure, fully immersed in medium-temperature anti-wear transmission oil mixed with hard metal fine friction particles all year round, and exposed to highway construction sites with huge temperature gaps between freezing winter and sweltering summer. High-rigidity precision sand-cast tin bronze alloy main sealing ring features natural metal self-lubricating crystalline texture, ultra-high compressive creep resistance and superior anti-asphalt mixed sharp hard particle scratch performance that ordinary single NBR/PU rubber and carbon-filled PTFE composite materials cannot match; uniform dense bronze casting crystal structure will not produce surface swelling, softening or layer peeling after long-term continuous soaking in hydraulic oil below 129℃, and the narrow split opening structure can automatically adjust outer diameter to compensate piston groove wear after tens of millions of reciprocating sliding cycles. The ultra-thin HNBR elastic backing liner maintains stable elastic pre-tightening tension at ambient temperature as low as -37℃, effectively eliminating gap loosening and internal cross oil leakage induced by bronze ring cold shrinkage in northern low-temperature winter highway construction environments. Compared with multi-piece three-layer PTFE composite piston seals, this integrated bronze split structure has fewer assembly accessories, simpler on-site installation steps and lower assembly misalignment failure rate; compared with single integral rubber piston seals, it completely avoids irreversible permanent compression set deformation and rapid extrusion damage under long-duration stable medium pressure loads. This targeted metal-rubber matched composite layered protection structure extends the overall service life of the piston seal by more than 89% compared with ordinary single rubber piston seals, and greatly reduces repeated maintenance labor costs and spare parts repetitive procurement comprehensive expenses for large highway engineering fleet operators.

Q: How can on-site professional large motor grader maintenance technicians quickly distinguish each independent component of this 07018-10904 piston seal ring set through unique color difference, surface texture and structural shape characteristic differences?
A: The tin bronze alloy main piston sealing ring presents uniform soft golden matte solid narrow single-split metal ring with fine dense sand-cast metal grain texture on the surface, smooth dry outer sliding surface without sticky rubber tactile sensation, and adopts narrow flat rectangular cross-section specially customized for large grader auxiliary clutch piston bidirectional medium-pressure hydraulic sealing requirements. The matched ultra-thin HNBR elastic backing liner is matte black ultra-thin strip soft rubber component with soft elastic touch, closely attached to the full inner circular edge of the bronze ring to supply even radial outward supporting tension. The bronze ring is equipped with one unique narrow single-side split opening reserved for assembly and automatic shrinkage compensation, which is the most intuitive structural feature to distinguish it from wide-split, double-split, stepped-split or integral non-split sealing rings. Every bronze sealing ring is etched with miniature micro laser engraved oversized dimension and part number identification codes corresponding to GD675-6 auxiliary clutch piston groove standard parameters, supporting one-to-one rapid classification and accurate size matching during full auxiliary clutch disassembly overhaul work. Inferior imitation thin copper seal rings have rough uneven surface texture, ultra-thin easily bent metal wall thickness, blurred or missing laser marking codes, and lack matched HNBR elastic backing liners; inferior single rubber replacement seals have no metal main sealing ring, only integrated single black rubber one-piece structure without narrow split opening design.

Q: What complete range of stable working pressure, maximum reciprocating sliding speed and extreme temperature operation limit conditions can this copper-HNBR composite piston seal ring withstand to maintain long-term stable zero cross-leakage auxiliary clutch sealing performance for GD675-6 large motor graders?
A: This complete integrated piston seal ring assembly can continuously and stably operate under stable auxiliary clutch hydraulic pressure of 22–30Mpa, and withstand repeated instantaneous uneven asphalt-stone mixed ground bump peak pressure surges up to 37Mpa without copper ring extrusion bending deformation, surface deep scratch abrasion or HNBR backing liner long-term elastic fatigue failure. The maximum allowable piston reciprocating sliding speed reaches 0.66m/s, perfectly adapting to frequent fast forward-reverse gear shifting of full-load large pavement leveling motor graders. The stable applicable full working temperature range covers -37°C ~ +132°C, fully meeting ultra-low temperature cold startup demands of northern outdoor large highway construction sites in winter and long-hour continuous medium-temperature auxiliary clutch operation under full pavement compaction load in hot summer months. Tin copper alloy main ring and HNBR oil-resistant backing liner both resist thermal oxidation aging, low-temperature hardening and hard metal particle abrasion after tens of millions of reciprocating cycles and repeated drastic cold-hot temperature alternations, maintaining zero internal cross-leakage of auxiliary clutch hydraulic oil all year round. The narrow split opening buffer design can absorb instantaneous pressure impact pulses, block tiny metal friction debris from directly scratching the copper smooth sliding surface, and effectively reduce abnormal auxiliary clutch disengagement, slipping, slow gear engagement response and grader irregular walking vibration noise faults caused by premature seal wear.

Q: What hidden auxiliary clutch core failure risks and corresponding tangible comprehensive economic losses will large highway engineering project fleet management personnel face if cheap inferior imitation thin copper or single rubber piston seals replace this composite 07018-10904 piston seal ring?
A: Low-cost inferior imitation thin copper ring or single NBR/PU integral rubber piston seals lack thick high-density sand-cast tin copper main body and matched HNBR elastic backing liners, only relying on ultra-thin metal or single-layer rubber for unilateral pressure sealing. Under long-term continuous medium auxiliary clutch hydraulic pressure and frequent high-speed reciprocating sliding movement, thin imitation copper rings will easily bend, crack and produce unilateral deep scratch abrasion, while single rubber seals will form irreversible permanent compression set deformation, both leading to continuous internal cross-flow leakage of hydraulic oil inside the auxiliary clutch cavity. The GD675-6 large motor grader will show obvious auxiliary clutch disengagement malfunction, severe clutch slipping during full-load pavement compaction operation, obvious gear engagement delay, insufficient auxiliary driving traction output and frequent transmission overheating alarm signals, accompanied by dull harsh irregular metal friction noise during each forward-reverse gear shifting action. A large number of metal fine debris or rubber fragments peeled from worn inferior seals will circulate inside the closed auxiliary clutch hydraulic loop, blocking precision small-flow control valve spools and deeply scratching the ultra-high-precision honed large auxiliary clutch piston cylinder inner wall, resulting in relatively high comprehensive overhaul costs including cylinder secondary precision honing, full auxiliary clutch control valve group replacement and complete auxiliary clutch hydraulic oil drainage & full refilling. Frequent unexpected long-term equipment shutdown will interrupt core large highway construction projects such as expressway surface finishing and airport runway foundation earth shaping, bringing massive additional overtime labor wages and high idle large motor grader equipment rental loss fees. Severe complete seal failure may even cause sudden auxiliary power loss and walking stall during downhill medium-heavy load compaction operations, bringing major equipment collision damage and large highway construction site personal safety hidden hazards.

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