452-7462 4527462 Premium Hydraulic Cylinder Overhaul Seal Kit for Tracked Dozers 980H 980G

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2. 452-7462 parts on group :

3. 452-7462 picture:

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5. FAQ

Q: Could you elaborate on the material composition and respective functions of each part inside the kit?
A: Four tailored functional materials are adopted for different working scenarios. Modified NBR is applied for all static sealing joints and auxiliary O-rings. Solid forged PU acts as the core dynamic sealing component. Carbon-filled PTFE serves as high-pressure resistant backup rings. Yarn-blended phenolic fabric is manufactured into guide rings to share lateral force and reduce mechanical friction.

Q: What are the natural color and surface texture of each sealing component without any artificial pigment or coating?
A: Modified NBR parts present deep charcoal black with a soft matte surface and good elasticity. Solid forged PU seals are warm honey yellow with dense texture and firm touch. Carbon-filled PTFE rings are dark gray with fine carbon particle texture. Yarn-blended fabric guide rings are russet brown, with clear interwoven lines visible on the surface.

Q: What is the core working performance and sealing principle of solid forged PU in dozer hydraulic cylinders?
A: Featuring outstanding tear resistance and fatigue resistance, solid forged PU closely fits the reciprocating piston and rod during frequent blade lifting, lowering and angle adjustment. It can firmly confine high-pressure hydraulic fluid inside the cylinder chamber and maintain stable sealing effect even under continuous alternating load and long-duration mechanical movement.

Q: Why is carbon-filled PTFE matched to work together with PU main seals?
A: Carbon filler greatly improves the rigidity, wear resistance and pressure bearing capacity of PTFE. It can perfectly fill tiny assembly gaps in piston grooves. When the dozer blade pushes hard soil or rock piles and generates sudden hydraulic pressure peaks, this material can disperse excessive pressure effectively and prevent the PU sealing lip from being squeezed, deformed or fractured.

Q: In what aspects does modified NBR outperform ordinary rubber materials?
A: This upgraded NBR formula delivers excellent combined performance of oil resistance, low temperature resistance and ozone aging resistance. It will not harden or lose elasticity after long-term immersion in hydraulic oil, nor will it crack easily under the influence of outdoor wind, frost and temperature changes, adapting to all-weather outdoor operation.

6. Exhibition and Wearhous

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