CAT 472-8034 BEARING-SLV-GD

CAT 472-8034 YM is a Caterpillar genuine double-lip encased metal skeleton dust scraper seal. Its core application is on the outer end of the piston rod in hydraulic cylinders, effectively preventing dust, sand, and other contaminants from entering the cylinder, protecting the main seal and guide sleeve. It is suitable for the hydraulic systems of heavy-duty construction machinery such as excavators and loaders. The following are precise original factory specifications and application information, excluding replacement parts.

Core Technical Parameters

Item Details
Part Model: CAT 472-8034 YM (Double-lip metal frame dust scraper, press-fit installation)

Material: Main lip: Polyurethane (PU), hardness Shore A 90; Frame: Cold-rolled steel plate (SPCC), surface electrophoretic rust prevention; Auxiliary lip: Nitrile rubber (NBR), hardness Shore A 70, enhanced dust prevention and oil return

Key Dimensions: Fitting shaft diameter 80 mm (3.15 in), mounting groove inner diameter 95 mm, groove width 7.5 mm, total height 10 mm, lip interference 0.3-0.5 mm

Performance Parameters: Operating temperature -30℃ to +110℃, fitting piston rod speed ≤ 0.5 m/s, pressure resistance 0-0.3 MPa (no high pressure on the dustproof side), dustproof efficiency ≥ 98%

Single Weight: Approx. 0.08 kg (0.18 lbs)

Tolerance Standard: Inner diameter tolerance 0/-0.02 mm, skeleton outer diameter tolerance 0/+0.015 mm, lip thickness tolerance ±0.05 mm, surface roughness Ra ≤ 0.8 μm

Core Features: Double-lip design (main lip for dust scraping + auxiliary lip for leak prevention), metal skeleton ensures installation rigidity, PU main lip is wear-resistant and tear-resistant, suitable for dusty and vibrating conditions on construction sites.

Structure and Core Features:

Double-lip composite structure: The main lip is made of wear-resistant polyurethane material, effectively scraping sand and dust from the piston rod surface; the auxiliary lip is made of nitrile rubber to enhance sealing, prevent internal grease leakage, and block fine dust intrusion, providing double protection and extending the life of the main seal.

Metal skeleton support: The cold-rolled steel plate skeleton is electrophoretically treated, combining rigidity and rust resistance. It is not easily deformed after being pressed into the mounting groove, ensuring a good fit between the lip and the piston rod, suitable for the reciprocating motion of high-pressure hydraulic cylinders.

Press-in installation design: No additional fasteners are required; the skeleton is fixed by interference fit with the mounting groove, allowing for quick installation and meeting the needs of rapid maintenance in the field of construction machinery.

Optimized lip interference fit: A 0.3-0.5 mm interference fit ensures the lip fits tightly against the piston rod surface, thoroughly scraping dust without damaging the chrome plating of the rod, balancing dust prevention with motion resistance.

Compatible Models and Application Scenarios

Compatible Equipment: Outer ends of the piston rods of the boom cylinder, stick cylinder, and bucket cylinder of CAT 320, 325, and 330 series excavators, and 950, 966, and 972 series loaders. Also compatible with the lifting cylinders of some bulldozers.

Core Purpose: Installed in the mounting groove of the front cover of the hydraulic cylinder, it acts as the first dust barrier for the piston rod, preventing construction sand and dust from entering the cylinder interior, avoiding wear on the main seal and scratches on the cylinder barrel, ensuring the cleanliness of the hydraulic system, and suitable for harsh working conditions such as mining and infrastructure projects.