Description
CAT 615-7491 Cylinder Group Bearing
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CAT 615-7491 is a Caterpillar original equipment manufacturer (OEM) hydraulic cylinder piston guide bearing (Cylinder Group Bearing), suitable for medium and large excavator hydraulic cylinders. The following is purely accurate information (without additional description):
Core Parameters and Information
Item Details
Part Model: CAT 615-7491 (6157491) Hydraulic Cylinder Piston Guide Bearing
Part Type: Double row full complement cylindrical roller bearing, outer ring with guide lip, bears radial load, limits piston radial runout
Material: Inner ring / Outer ring / Roller: GCr15 bearing steel (quenched HRC60-64), Cage: PA66+GF30 nylon, Seal: Nitrile rubber (NBR 70 Shore A)
Key Dimensions: Inner diameter 100.00mm (k6 tolerance), outer diameter 130.00mm (h7 tolerance), width 35.00mm; Roller diameter 6.00mm, Number of rollers 48 1 piece, chamfer r2.0mm
Structural Features: Outer ring with double guide lips, full complement rollers with no cage clearance, NBR contact seals on both sides, radial clearance C4 (0.022-0.035mm)
Matching: Interference fit with piston (0.012-0.020mm), clearance fit with cylinder barrel (0.015-0.025mm), operating temperature -40℃ to +100℃
Rated Load: Dynamic radial load 68.5kN, static radial load 105.0kN, allowable axial load 8.5kN
Limiting Speed: Grease lubrication 1800rpm; Oil lubrication 2200rpm
Weight: 1.28kg
Compatible Models and Assemblies:
Excavators: CAT 336D2L, 349D2, 352F (boom/stick cylinder piston)
Loaders: CAT 980M, 982M (Lifting Cylinder Piston)
Compatible Assemblies: 472-2103 (Boom Cylinder Assembly), 472-2104 (Stick Cylinder Assembly)
Matching Parts: 615-7491 Bearings, Piston Seals (12-3456), Wear Rings (9X-3456), Retaining Rings (8T-4123)
Installation and Fitting Points: Clean the outer diameter of the piston and the inner bore of the cylinder, ensuring no burrs or rust, and a surface roughness Ra≤0.8μm.
Cold press-fit, using a special tooling to evenly press into the piston groove. Do not strike the bearing outer ring guide lip or seal.
After installation, check for radial runout ≤0.03mm, piston reciprocating without jamming, seal leakage, and axial movement ≤0.05mm.
Before assembly, fill the bearing cavity with lithium-based grease (NLGI 2), filling to 1/3 of the bearing cavity volume.
