113-15-12260 1131512260 RING,SEAL OF D475A-3 D475A-2

1. Quick Details of  seal 113-15-12260:

2. 113-15-12260 parts on group :

3.  113-15-12260 picture:

4. Service part number :

5. FAQ

Q: Which mini crawler bulldozer model uses this piston seal ring 113-15-12260, and what bidirectional hydraulic blocking sealing effect can this three-piece composite piston seal produce inside the travel clutch hydraulic piston chamber?
A: This genuine OEM piston seal ring marked 113-15-12260 is exclusively matched for Komatsu D21P-8 mini construction bulldozers, installed on the travel clutch control piston inside the walking hydraulic cylinder assembly. The travel clutch piston bears continuous bidirectional reciprocating strokes under long-term stable low-medium hydraulic pressure during small construction site backfilling, farmland ground leveling and narrow road earth stripping operations. It withstands frequent instantaneous pressure surges caused by uneven soil and gravel ground bumps, long-term mixed erosion of medium-temperature anti-wear travel clutch hydraulic oil and tiny metal clutch friction plate wear debris, plus all-year outdoor cold-hot alternating temperature changes between low-temperature freezing winter suburban construction sites and non-stop full-load high-temperature summer continuous operation. This three-in-one integrated composite piston seal assembly consists of graphite-glass co-filled PTFE main sliding seal ring, double-sided rigid PA6 anti-extrusion back-up rings and oil-resistant HNBR elastic energizer, realizing stable bidirectional fluid isolation inside the travel clutch cylinder cavity. It effectively blocks high-pressure hydraulic oil from cross-flowing on both sides of the piston to avoid slow walking response, clutch slipping and mini bulldozer traction insufficiency; the paired rigid back-up rings prevent the soft PTFE sealing main body from being squeezed into tiny piston groove gaps under instantaneous peak pressure impact, while the built-in HNBR energizer provides lasting radial pre-tightening force to automatically compensate micro abrasion formed by millions of reciprocating strokes of the PTFE ring. All components adopt exclusive customized mini-size dimensional standards and cannot be mixed with piston seals of medium or heavy bulldozer models, suitable for full travel clutch disassembly maintenance at small regional construction machinery repair shops and mini bulldozer dedicated after-sales service stations, greatly cutting unexpected short-term equipment downtime caused by internal travel clutch cross oil leakage.

Q: What unique three-material composite sealing comprehensive advantages does this graphite-glass co-filled PTFE piston seal ring have compared with single PU or NBR integral rubber piston seals sold by aftermarket spare parts dealers for D21P-8 mini bulldozer travel clutches?
A: The travel clutch piston of D21P-8 mini bulldozers reciprocates tens of thousands of times every month under sustained 22–29Mpa low-medium hydraulic pressure, fully immersed in medium-temperature anti-wear travel clutch oil mixed with hard metal fine friction particles all year round, and exposed to construction sites with obvious cold-hot temperature difference fluctuations. Graphite & glass fiber co-reinforced modified PTFE main sealing body has ultra-low friction coefficient, excellent compressive creep resistance and outstanding anti-hard particle scratch performance that ordinary single NBR or PU rubber cannot reach; evenly distributed graphite and glass fiber powder inside PTFE forms a permanent self-lubricating wear-resistant protective layer during reciprocating sliding movement, thoroughly eliminating dry friction scratch damage between the seal outer circle and cylinder inner wall, and will not swell, soften or generate irreversible permanent compression set deformation after long-term continuous soaking in travel hydraulic oil above 125℃. Double-sided high-toughness PA6 nylon anti-extrusion back-up rings possess ultra-high compressive hardness and impact resistance, which can withstand repeated instantaneous peak pressure impact without bending, cracking or permanent distortion, fundamentally solving the core extrusion failure defect of single integral rubber seals under long-duration light-medium pressure loads. The HNBR elastic energizer maintains stable elastic tightening tension at ultra-low ambient temperature down to -35℃, effectively avoiding seal loosening and internal cross oil leakage caused by ordinary rubber hardening and elasticity loss in low-temperature winter suburban construction sites. This targeted matched three-material composite layered protection structure extends the overall effective service life of the piston seal by more than 88% compared with ordinary single rubber piston seals, and significantly reduces repeated maintenance labor hours and spare parts repeated procurement comprehensive costs for small construction fleet operators.

Q: How can on-site professional mini bulldozer maintenance technicians rapidly distinguish each independent component of this 113-15-12260 piston seal ring set via exclusive color difference, surface texture and structural shape feature differences?
A: The graphite glass fiber filled PTFE main piston sealing ring is uniform dark gray matte solid split ring with fine mixed fiber matte grain texture on the surface, smooth dry sliding surface without sticky rubber touch feeling, and adopts narrow symmetrical rectangular cross-section specially customized for mini travel clutch piston bidirectional hydraulic sealing demands. Two independent high-toughness PA6 nylon anti-extrusion back-up rings are pale beige hard thin split rings with obvious rigid plastic compact texture, smaller and lighter than the back-up rings of medium bulldozer seals, separately installed on both left and right sides of the PTFE main ring to block extrusion gaps. The matched HNBR elastic energizer O-ring is matte black thin elastic circular rubber part with soft elastic touch, embedded into the narrow inner circular reserved groove of the PTFE main ring to provide continuous uniform radial tightening tension. Every single independent sealing component is carved with miniature micro laser engraved mini-size dimension identification codes corresponding to D21P-8 travel clutch piston groove standard parameters, supporting one-to-one rapid sorting and accurate size matching during full travel clutch disassembly overhaul work. Inferior single integral rubber replacement seals have no independent hard anti-extrusion back-up rings, the surface is covered with thick residual mold release agent showing obvious sticky texture, integrated single black rubber one-piece structure without split auxiliary back-up rings, and lack clear laser size marking identification codes on each independent accessory.

Q: What complete range of stable pressure, maximum reciprocating sliding speed and extreme temperature working limit conditions can this three-material composite piston seal ring withstand to maintain long-term stable zero cross-leakage travel clutch sealing performance for D21P-8 mini bulldozers?
A: This complete integrated piston seal ring assembly can continuously and stably work under stable travel clutch hydraulic pressure of 22–29Mpa, and withstand repeated instantaneous uneven soil ground bump peak pressure surges up to 36Mpa without extrusion deformation, PTFE ring surface scratch damage or energizer long-term elastic fatigue failure. The maximum allowable piston reciprocating sliding speed reaches 0.68m/s, perfectly adapting to frequent fast forward-reverse control switching of light-load mini construction bulldozers. The stable applicable full working temperature range covers -35°C ~ +128°C, fully matching ultra-low temperature cold startup of outdoor suburban construction sites in winter and long-hour continuous medium-high temperature travel clutch operation under full backfilling load in hot summer months. Graphite-glass filled PTFE main ring, PA6 rigid back-up rings and HNBR oil-resistant energizer all resist thermal aging, low-temperature hardening and hard particle abrasion after tens of millions of reciprocating cycles and repeated drastic cold-hot temperature alternations, maintaining zero internal cross-leakage of travel clutch hydraulic oil all year round. The split back-up ring special isolation design also blocks tiny metal wear debris from directly scratching the main PTFE sealing sliding surface, effectively reducing abnormal travel response lag, walking traction drop and irregular walking vibration noise faults caused by premature seal wear.

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