CAT 030-8918 BEARING

CAT 030-8918 is a genuine Caterpillar radial spherical plain bearing (purely genuine and accurate information, no additional description), suitable for the boom, stick, and cylinder articulation points of mini excavators/skid steer loaders, used for swing support and heavy load transfer, and compatible with 030-3328 bushings and 009-3799 retainers.

Core Parameters and Information

Item Details
Part Model: CAT 030-8918 (0308918) Bearing (Ternary Spherical Plain Bearing)
Part Type: Integral radial spherical plain bearing with inner ring and self-lubricating gasket, suitable for heavy-load oscillating conditions, absorbing shock and compensating for installation errors.

Material: Outer ring (42CrMo tempered steel, HRC30-35), inner ring (ZCuAl10Fe3 aluminum bronze, HB120-140), self-lubricating layer (PTFE + bronze powder composite layer, thickness 0.3mm)

Key Dimensions: Inner diameter 40 mm, outer diameter 52 mm, width 25 mm, inner ring thickness 3 mm, outer ring locating groove width 4 mm, depth 1 mm

Structural Features: Outer ring with axial locating groove, inner ring inner wall evenly distributed with oil reservoir holes (diameter 1.2 mm, depth 1.5 mm, quantity 12), suitable for 030-3328 bushing outer diameter, compatible with… 009-3799 Fixture

Surface Treatment: Outer ring blackened + oxidized, inner ring tin-plated, self-lubricating layer natural color

Matching: Clear fit with 030-3328 bushing (D9/h9, clearance 0.05-0.08 mm), transition fit with mounting base (H7/k6, interference 0.01-0.03 mm)

Rated Load: Radial dynamic load 32 kN, radial static load 68 kN, allowable impact load 40 kN, maximum swing angle ±20°

Operating Temperature: -40℃ ～ +150℃

Weight: 0.26 kg

Compatible Models and Assemblies

Compatible Parts: CAT 030-3328 bushing, CAT 009-3799 fixture, CAT 009-2039 trunnion

Compatible Equipment: CAT 301.7CR/302.7CR Excavator and 242D/272D skid steer loader boom-stick hinge point, bucket cylinder upper hinge point

Matching parts: 030-8918 bearing, 030-3328 bushing, 009-2039 trunnion, 009-3799 retainer, M8×20 socket head cap screw set

Installation and maintenance points:

Clean the bearing inner and outer rings, bushing outer diameter, and mounting seat holes to remove burrs and oil stains, ensuring the mounting surface roughness Ra≤1.6μm.

Cold press installation: Use a special press to press the bearing into the mounting seat, controlling the pressing force to 8-10 kN. Directly hammering the outer ring end face is strictly prohibited.

Positioning and fixing: After the bearing is in place, insert the 009-3799 retainer into the outer ring positioning groove, ensuring axial movement ≤0.05 mm.

Maintenance: Check every 1500 working hours. Replace if the inner diameter wear exceeds 0.2 mm, or if the self-lubricating layer falls off or the oil reservoir is blocked. At the same time, check the condition of the bushing and retainer.