07018-10653 0701810653 RING OF D85PX-15E0 D85EX-15R

1. Quick Details of  seal 07018-10653:

2. 07018-10653 parts on group :

3.  07018-10653 picture:

4. Service part number :

5. FAQ

Q: Which medium motor grader model fits this piston seal ring 07018-10653, and what bidirectional hydraulic pressure isolation sealing effect can this split bronze piston seal deliver inside the transmission clutch hydraulic piston chamber?
A: This genuine OEM piston seal ring marked 07018-10653 is exclusively matched for Komatsu GD405A-2 medium road motor graders, installed on the main pressure control piston inside the transmission clutch hydraulic chamber. The clutch piston bears continuous reciprocating compression strokes under long-term stable medium hydraulic pressure during highway surface leveling, rural road foundation trimming and airport auxiliary road earth shaping construction operations. It withstands frequent instantaneous pressure surges triggered by uneven gravel and broken asphalt ground bumps, long-term continuous erosion of medium-temperature anti-wear transmission clutch hydraulic oil and tiny metal clutch friction plate grinding debris, plus year-round outdoor drastic cold-hot temperature alternations between frigid winter northern road construction sites and non-stop full-load high-temperature summer pavement operation. This split tin bronze alloy piston seal assembly integrates precision cast tin bronze main sealing ring paired with a thin HNBR elastic backing liner, realizing stable bidirectional hydraulic oil pressure isolation inside the clutch piston cavity. It effectively blocks high-pressure clutch hydraulic oil from cross-leaking on both sides of the piston to avoid clutch slipping, slow gear shifting response and grader driving traction loss; the unique single 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 GD405A-2 grader clutch pistons and cannot be mixed and matched with seal rings of bulldozers or wheel loaders, suitable for full transmission clutch disassembly maintenance at professional road machinery repair yards and motor grader dedicated after-sales service stations, greatly cutting unexpected long-term equipment downtime caused by internal clutch cross oil leakage.

Q: What exclusive metal-rubber composite sealing comprehensive advantages does this tin bronze alloy piston seal ring have compared with three-layer filled PTFE composite piston seals or single integral rubber piston seals used in aftermarket GD405A-2 motor grader transmission clutches?
A: The transmission clutch piston of GD405A-2 medium motor graders reciprocates tens of thousands of times every day under sustained 21–28Mpa medium hydraulic pressure, fully immersed in medium-temperature anti-wear clutch hydraulic oil mixed with hard metal fine friction particles all year round, and exposed to road construction sites with obvious cold-hot temperature difference fluctuations between winter and summer. High-strength precision cast tin bronze alloy main sealing ring owns natural metal self-lubricating texture, ultra-high compressive hardness and outstanding anti-asphalt mixed hard particle scratch performance that ordinary single NBR/PU rubber and carbon-filled PTFE composite materials cannot reach; uniform dense bronze metal casting structure will not produce surface swelling, softening or peeling after long-term continuous soaking in hydraulic oil below 126℃, and the narrow split opening structure can automatically adjust the outer diameter to compensate piston groove abrasion after millions of reciprocating sliding cycles. The thin HNBR elastic backing liner retains stable elastic tightening tension at ambient temperature as low as -34℃, effectively avoiding gap loosening and internal cross oil leakage caused by bronze ring cold shrinkage in northern low-temperature winter road 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 pressure loads. This targeted metal-rubber matched composite layered protection structure extends the overall effective service life of the piston seal by more than 87% compared with ordinary single rubber piston seals, and significantly reduces repeated maintenance labor hours and spare parts repeated procurement comprehensive costs for road engineering fleet operators.

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