419-46-12480 4194612480 PACKING SEAL FOR WA320-3 WA480-6

1. Quick Details of  seal 419-46-12480:

2. 419-46-12480 parts on group :

3.  419-46-12480 picture:

4. Service part number :

 
5. FAQ

Q: What unique layered material performance advantages does this four-in-one piston rod seal bring to wheel loader axle support rams compared with single-layer PU or NBR piston rod seals sold separately on the aftermarket?
A: The axle support piston rod of Komatsu WA380-3/WA4003 wheel loaders works under long-term alternating static heavy load and irregular ground bump reciprocating impact pressure every work shift, enduring long-term immersion in medium-temperature hydraulic oil mixed with fine sand and metal wear debris, plus year-round outdoor exposure to mud splashes, winter frost and wind-blown construction grit in all seasonal loading environments. Reinforced HNBR main sealing body outperforms ordinary single NBR seals greatly in low-temperature elasticity and long-term reciprocating fatigue resistance; it will not harden, swell or lose uniform rod clinging force after thousands of cold start axle buffer reciprocating cycles in freezing winter construction sites. Built-in carbon-filled PTFE back-up ring can bear instantaneous peak impact pressure generated by ground bumps, blocking the soft HNBR sealing lip from being extruded into tiny rod-cylinder clearance gaps and avoiding permanent lip deformation failure. Independent NBR dust wiper lip keeps soft scraping elasticity under low temperature, continuously cleaning sand and mud attached to the piston rod surface to stop abrasive particles from scratching the main sealing lip. Polyester fabric composite guide strip reduces direct metal friction between piston rod and cylinder end cap hole, lowering rod surface abrasion and extending the overall service cycle of the rod seal by more than 86% compared with single-layer rubber piston rod seals.

Q: How can field loader maintenance technicians quickly identify each functional layer of this 419-46-12480 piston rod seal through distinct color and structural shape features?
A: The core HNBR pressure sealing body is matte jet black, forming the middle main circular ring structure of the whole seal, with a smooth inner circular sealing surface tightly fitted to the piston rod. The embedded carbon-filled PTFE anti-extrusion back-up ring is off-white thin flat ring, hidden in the inner groove of the HNBR body, with evenly scattered tiny black carbon particles visible on the surface, which can be clearly distinguished from full rubber components. The outer protruding NBR dust wiper lip is also matte black thin soft rubber edge, extending outward as an asymmetrical scraping brim, separate from the thick main HNBR sealing ring. The outer wrapped polyester fabric guide strip is light beige thin woven layer attached to the seal outer circumference, with obvious textile fiber texture on the cross-section, the only non-rubber rigid wear layer of the whole seal. The whole seal is an integrated one-piece circular rod seal with special width and inner diameter customized for WA380-3/WA400-3 axle support piston rods, with size identification marks printed on the outer fabric layer to speed up matching during on-site cylinder overhaul.

Q: What full range of temperature and static heavy load + uneven ground bump alternating reciprocating pressure working conditions can this four-layer composite piston rod seal withstand to maintain stable long-term leak-free axle support performance?
A: This integrated axle support piston rod seal can steadily sustain average steady axle buffer working pressure up to 455 bar, and withstand repeated instantaneous uneven ground bump peak pressure surges reaching 620 bar without extrusion lip cracking, rubber aging swelling or fabric layer peeling failure. HNBR and NBR rubber layers retain complete elastic recovery and stable reciprocating sealing performance across a wide temperature window of -44°C ~ +126°C, perfectly adapting to frozen mountain quarry loading construction in winter and non-stop high-temperature aggregate stockpiling operation during hot summer months. Carbon PTFE back-up ring and polyester fabric guide strip maintain stable anti-extrusion and anti-friction properties from -33°C up to 130°C, coping with variable temperature hydraulic oil circulation during all-day uninterrupted heavy-duty loading work. All composite layers resist softening, warping and accelerated abrasive wear through millions of back-and-forth piston rod reciprocating cycles and frequent extreme hot-cold temperature alternation, delivering consistent leak-free axle buffer protection in all year-round outdoor construction loading environments.

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