07018-31907 0701831907 RING,(F2310-51A0 -17 ) OF D475A-5A D475A-2

1. Quick Details of  seal 07018-31907:

2. 07018-31907 parts on group :

3.  07018-31907 picture:

4. Service part number :

5. FAQ

Q: Which large wheel loader model matches this piston seal ring 07018-31907, and what bidirectional hydraulic pressure isolation effect can this split bronze piston seal realize inside the torque converter piston hydraulic chamber?
A: This genuine OEM piston seal ring marked 07018-31907 is exclusively designed for Komatsu WA470-8 large mining wheel loaders, installed on the pressure regulating piston inside the torque converter hydraulic cavity. The torque converter piston bears continuous reciprocating compression strokes under long-term stable medium-high hydraulic pressure during large quarry aggregate loading, stockpile bulk material shoveling and highway construction earth transportation heavy-duty operations. It endures frequent instantaneous pressure surges triggered by uneven gravel and rock ground sharp bumps, long-term continuous erosion of medium-high temperature anti-wear torque converter hydraulic oil and tiny metal transmission gear grinding debris, plus year-round outdoor drastic cold-hot temperature alternations between high-altitude freezing winter quarry sites and non-stop full-load high-temperature summer continuous operation. This split tin bronze alloy piston seal assembly integrates precision forged tin bronze main sealing ring paired with a thin HNBR elastic backing liner, realizing stable bidirectional hydraulic oil pressure isolation inside the torque converter piston cavity. It effectively blocks high-pressure hydraulic oil from cross-leaking on both sides of the piston to avoid torque converter power drop, slow bucket lifting response and loader driving traction insufficiency; the unique double narrow split opening design supports automatic radial shrinkage compensation to offset long-term piston groove abrasion, while the matched HNBR elastic liner maintains continuous outward supporting tension to fill tiny piston groove clearances and prevent bronze ring extrusion bending deformation under instantaneous peak pressure impact. All components adopt customized dimensional standards exclusive to WA470-8 torque converter pistons and cannot be mixed and matched with seal rings of bulldozers or small loaders, suitable for full torque converter disassembly maintenance at large quarry dedicated machinery repair yards and comprehensive wheel loader one-stop after-sales service stations, greatly cutting unexpected long-term equipment downtime caused by internal torque converter cross oil leakage.

Q: What exclusive metal-rubber composite sealing comprehensive advantages does this tin bronze alloy piston seal ring have compared with filled PTFE three-piece composite piston seals or single integral rubber piston seals used in aftermarket WA470-8 wheel loader torque converters?
A: The torque converter control piston of WA470-8 large wheel loaders reciprocates millions of times every month under sustained 24–33Mpa medium-high hydraulic pressure, fully immersed in medium-high temperature anti-wear torque converter hydraulic oil mixed with hard metal fine grinding particles all year round, and exposed to construction sites with obvious cold-hot temperature difference fluctuations between frigid winter and sweltering summer. High-strength precision forged tin bronze alloy main sealing ring owns natural metal self-lubricating texture, ultra-high compressive hardness and outstanding anti-sharp hard particle scratch performance that ordinary single NBR/PU rubber and carbon-filled PTFE composite materials cannot reach; uniform dense bronze metal forging structure will not produce surface swelling, softening or peeling after long-term continuous soaking in hydraulic oil above 129℃, and the double narrow split opening structure can automatically adjust the outer diameter to compensate piston groove abrasion after tens of millions of reciprocating sliding cycles. The thin HNBR elastic backing liner retains stable elastic tightening tension at ambient temperature as low as -37℃, effectively avoiding gap loosening and internal cross oil leakage caused by bronze ring cold shrinkage in high-altitude alpine winter quarry construction environments. Compared with multi-piece three-layer PTFE composite piston seals, this bronze integrated split structure has fewer assembly accessories, simpler installation steps and lower assembly failure probability; compared with single integral rubber piston seals, it completely avoids permanent compression set deformation and rapid extrusion damage under long-duration stable medium-heavy pressure loads. This targeted metal-rubber matched composite layered protection structure extends the overall effective service life of the piston seal by more than 90% compared with ordinary single rubber piston seals, and significantly reduces repeated maintenance labor hours and spare parts repeated procurement comprehensive costs for large quarry fleet operators.

Q: How can on-site professional large wheel loader maintenance technicians rapidly distinguish each independent component of this 07018-31907 piston seal ring set via exclusive color difference, surface texture and structural shape feature differences?
A: The tin bronze alloy main piston sealing ring is uniform light golden brass matte solid double narrow split metal ring with fine dense metal forging grain texture on the surface, smooth dry outer sliding surface without sticky rubber touch feeling, and adopts medium flat rectangular cross-section specially customized for torque converter piston bidirectional medium-high pressure hydraulic sealing demands. The matched thin HNBR elastic backing liner is matte black ultra-thin strip soft rubber accessory with soft elastic touch, closely attached to the full inner circular edge of the bronze ring to provide uniform radial outward supporting tension. The bronze ring has two symmetrical narrow split openings reserved for installation and automatic shrinkage compensation, which is the most intuitive structural feature to distinguish it from single-split or integral non-split sealing rings. Every bronze sealing ring is engraved with miniature micro laser engraved dimension and part number identification codes corresponding to WA470-8 torque converter piston groove standard parameters, supporting one-to-one rapid sorting and accurate size matching during full torque converter disassembly overhaul work. Inferior imitation thin copper seal rings have rough uneven surface texture, ultra-thin easy-to-bend metal wall thickness, fuzzy 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 double split opening design.

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