CAT 030-3328 BUSHING

CAT 030-3328 is a Caterpillar genuine radial self-lubricating steel backing bushing (pure original factory information, no additional description), used at the articulation points of mini excavators/skid steer loaders, providing wear resistance, friction reduction, and positioning, and compatible with specific trunnions and bearings.

Core Parameters and Information

Item Details
Part Model: CAT 030-3328 (0303328) Bushing (Radial Self-Lubricating Steel Back Composite Bushing)
Part Type: Steel back + copper alloy + PTFE self-lubricating layer composite bushing, used for radial support of boom, stick, and cylinder hinge points, absorbing shock and vibration.

Material: Steel back (Q345B) + intermediate layer (tin bronze CuSn6) + surface layer (PTFE + bronze powder composite self-lubricating layer, thickness 0.3mm)

Key Dimensions: Inner diameter 40 mm (tolerance H7), outer diameter 48 mm (tolerance g6), length 35 mm, positioning groove width 5 mm, depth 1 mm

Structural Features: The outer ring of the steel back has an axial positioning groove, and the inner ring has 12 evenly distributed 1.2mm diameter oil reservoir holes. The self-lubricating layer contains solid lubricant. Compatible with 009-3799 retainer.

Matching Method: With 009-2039 Trunnion clearance fit (clearance 0.04-0.07 mm), transition fit with 009-4857 bearing (interference 0.01-0.03 mm)

Rated Performance: Radial rated load 35 kN, allowable swing angle ±15°, operating temperature -40℃ ～ +120℃, wear life ≥5000 working hours

Weight: 0.18 kg

Compatible Models and Assemblies:

Compatible Parts: CAT 009-2039 trunnion, CAT 009-3799 retainer, CAT 009-4857 bearing

Compatible Equipment: Boom-stick hinge point of CAT 301.7CR/302.7CR excavators, upper hinge point of bucket cylinder of 242D/272D skid steer loaders

Matching Parts: 030-3328 bushing, 009-2039 Trunnion, 009-3799 retainer, 009-4857 bearing, M8×25 socket head cap screw

Installation and Maintenance Points
**Clean the mounting hole and bushing surface, removing burrs and oil stains, ensuring the surface roughness Ra ≤ 1.6μm.**

Cold Press Installation: Use a special press to press the bushing into the mounting seat, controlling the pressing force to 10-12 kN. Direct hammering of the end face is strictly prohibited.

Positioning and Fixing: After the bushing is in place, insert the 009-3799 retainer to lock the axial position. Axial movement ≤ 0.05 mm.

Maintenance: Inspect every 1500 working hours. Replace when the inner diameter wear exceeds 0.2 mm, or when the self-lubricating layer has peeled off or the oil reservoir is blocked. Simultaneously check the condition of the trunnion and retainer.