195-15-49220 1951549220 RING,SEAL OF D375A-5 D375A-3

1. Quick Details of  seal 195-15-49220:

2. 195-15-49220 parts on group :

3. 195-15-49220  picture:

4. Service part number :

5. FAQ

Q: Which heavy mining bulldozer model adopts this piston seal ring 195-15-49220, and what two-way hydraulic isolation sealing capacity can this three-piece composite piston seal realize inside the torque converter control piston hydraulic chamber?
A: This genuine OEM piston seal ring marked 195-15-49220 is exclusively matched for D375A-6 heavy open-pit mining bulldozers, installed on the pressure control piston inside the torque converter hydraulic cavity. The torque converter control piston bears continuous bidirectional reciprocating strokes under long-duration stable high hydraulic pressure during super-large open-pit mine bulk ore pushing, mountain rugged rock road foundation trimming and massive construction waste soil stripping construction operations. It endures frequent instantaneous pressure spikes triggered by uneven rock ground violent bumps, long-term mixed erosion of high-temperature torque converter anti-wear hydraulic oil and tiny metal gear & bearing grinding debris, plus year-round outdoor drastic temperature alternations between high-altitude freezing winter mine zones and non-stop full-load high-temperature summer continuous operation. This three-in-one integrated composite piston seal assembly consists of a carbon powder filled PTFE main sliding seal ring, double-sided rigid POM anti-extrusion back-up rings and oil-resistant HNBR elastic energizer, achieving stable bidirectional fluid isolation inside the torque converter cavity. It effectively blocks high-pressure hydraulic oil from cross-flowing on both sides of the piston to avoid torque converter power loss, slow vehicle travel response and walking traction attenuation; the paired rigid back-up rings prevent the soft PTFE sealing main body from being squeezed into tiny piston groove clearances under instantaneous peak pressure impact, while the built-in HNBR energizer delivers sustained radial pre-tightening force to automatically compensate micro abrasion formed by millions of long-term reciprocating strokes of the PTFE ring. All components adopt exclusive customized dimensional standards and cannot be mixed and matched with piston seals of other bulldozer models, suitable for full torque converter disassembly maintenance at super-large open-pit bulldozer dedicated repair yards and comprehensive heavy construction machinery one-stop service stations, greatly cutting unexpected long-term equipment downtime caused by internal torque converter cross oil leakage.

Q: What distinctive three-material composite sealing comprehensive advantages does this carbon powder filled PTFE piston seal ring hold compared with single PU or NBR integral rubber piston seals supplied by aftermarket spare parts dealers for D375A-6 bulldozer torque converters?
A: The torque converter control piston of D375A-6 heavy mining bulldozers reciprocates millions of times every month under sustained 31–39Mpa high hydraulic pressure, fully immersed in high-temperature anti-wear torque converter oil mixed with hard metal fine grinding particles all year round, and exposed to cold-hot alternating complex working environments with large temperature difference fluctuations. Carbon powder reinforced modified PTFE main sealing body owns 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 carbon 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 torque converter oil above 132℃. Double-sided high-rigidity POM polyformaldehyde 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 heavy pressure loads. The HNBR elastic energizer maintains stable elastic tightening tension at ultra-low ambient temperature down to -44℃, effectively avoiding seal loosening and internal cross oil leakage caused by ordinary rubber hardening and elasticity loss in high-altitude alpine winter mine construction sites. This targeted matched three-material composite layered protection structure extends the overall effective service life of the piston seal by more than 97% compared with ordinary single rubber piston seals, and significantly reduces repeated maintenance labor hours and spare parts repeated procurement comprehensive costs for super-large open-pit mine fleet operators.

Q: How can on-site professional heavy bulldozer maintenance technicians rapidly distinguish each independent component of this 195-15-49220 piston seal ring set via exclusive color difference, surface texture and structural shape feature differences?
A: The carbon powder filled PTFE main piston sealing ring is uniform dark black matte solid split ring with fine dense carbon grain matte texture on the surface, smooth dry sliding surface without sticky rubber touch feeling, and adopts symmetrical rectangular cross-section specially customized for bidirectional torque converter hydraulic sealing demands. Two independent high-rigidity POM polyformaldehyde anti-extrusion back-up rings are pale milky white hard thin split rings with obvious rigid plastic compact texture, harder, lighter and smoother than all single rubber materials, 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 elastic circular rubber part with soft elastic touch, embedded into the 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 dimension identification codes corresponding to D375A-6 torque converter piston groove standard parameters, supporting one-to-one rapid sorting and accurate size matching during full torque converter 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 torque converter sealing performance for D375A-6 heavy mining bulldozers?
A: This complete integrated piston seal ring assembly can continuously and stably work under stable torque converter hydraulic pressure of 31–39Mpa, and withstand repeated instantaneous uneven rock ground bump peak pressure surges up to 46Mpa without extrusion deformation, PTFE ring surface scratch damage or energizer long-term elastic fatigue failure. The maximum allowable piston reciprocating sliding speed reaches 0.92m/s, perfectly adapting to frequent fast forward-reverse control switching of full-load heavy mining bulldozers. The stable applicable full working temperature range covers -44°C ~ +152°C, fully matching ultra-low temperature cold startup of high-altitude alpine open-pit mines in winter and long-hour continuous high-temperature torque converter operation under full ore pushing load in hot summer months. Carbon powder filled PTFE main ring, POM 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 torque converter 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 torque converter control response lag, walking traction drop and irregular walking vibration noise faults caused by premature seal wear.

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