421-22-31771 4212231771 Oil Seal Repair Kit for Medium Articulated Wheel Loader WA470-6 GD755-3

1. Quick Details of  seal 421-22-31771:

2. 421-22-31771 parts on group :

3. 421-22-31771  picture:

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5. FAQ

Q: What four distinct raw materials compose all sealing components inside this oil seal package?
A: The whole kit consists of hydrolysis-resistant HNBR primary lip rubber, carbon powder modified PTFE low-friction liner, heat-resistant ACM acrylic rubber and compact polyester needled felt dedicated to outer dustproof shielding structure.

Q: What natural raw color does each oil seal component retain without artificial pigment addition?
A: HNBR main oil seals are fine-textured solid black, carbon-filled PTFE inner liners are deep iron gray, ACM auxiliary shaft seals are pale cream beige, polyester needled dust felt is muted light brown.

Q: What core sealing function does HNBR fulfill on the loader’s rotating drive and steering shafts?
A: As the core lip sealing substrate, HNBR relies on steady compression recovery to block gear oil and steering hydraulic fluid leakage while articulated steering shafts swing flexibly and drive axles keep continuous rotation under frequent bumpy-site loading and shifting.

Q: What is the design purpose of bonding carbon-filled PTFE lining on the inner lip of HNBR oil seal?
A: It forms a smooth low-friction contact layer against polished metal shaft surface, reduces operational friction heat and stops sharp fine sand particles from abrading inner sealing lip in dusty outdoor construction surroundings.

Q: What unique practical advantages does ACM rubber have compared with regular NBR rubber grade?
A: ACM has prominent long-term thermal ageing resistance and anti-oxidation property, keeping stable sealing tightness even after long-term immersion in high-temperature degraded gear oil inside closed axle housings during all-day uninterrupted equipment operation.

Q: At which precise high-temperature mounting positions are ACM rubber oil seals arranged?
A: ACM seals are mainly installed at transmission rear output shaft and inner hub sealing seat of front drive axle, positions where enclosed lubricating oil maintains relatively high working temperature after long running.

Q: What protective role does polyester needled dust felt play for the whole oil seal assembly?
A: It serves as the outermost multi-layer barrier to intercept mud splashes, fine gravel and airborne construction debris, preventing external grit from piercing into inner rubber lip and greatly extending overall oil seal service lifespan.

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