CAT 6U-3003 BUSH

CAT 6U-3003 is a Caterpillar original flange-mounted steel-backed bronze bushing used for friction reduction and positioning at pin hinges. The following is purely precise information (without additional description):

Core Parameters and Information

Item Details
Part Model: CAT 6U-3003 (6U3003) Flange-mounted Steel-backed Bronze Bushing

Part Type: Radial support bushing with positioning flange, compatible with boom/stick pins, withstands radial loads and minor impacts

Material: Steel backing (Q345B, 3.0mm thickness) + copper-lead alloy (CuPb10Sn10, 5.0mm thickness) + PTFE surface layer (0.2mm thickness), with surface oil grooves

Key Dimensions: Inner diameter 50.00mm (H7 tolerance), outer diameter 63.00mm (r6 tolerance), flange outer diameter 75.00mm, total length 45.00mm, flange thickness 8.00mm, oil groove width 2.0mm, depth 0.5mm (4 evenly distributed grooves)

Structural Features: Flange positioning + cylindrical body, with axial oil hole (φ3mm) and circumferential oil groove, compatible with O-ring groove (φ60×2.4mm), static radial clearance 0.05-0.08mm

Compatible Structure: Clear fit with pin shaft (0.05-0.08mm), interference fit with mounting hole (0.010-0.020mm), operating temperature -30℃ to +110℃, maximum radial load 120kN

Lubrication Requirements: Grease lubrication (CAT DEO-ULS No. 2 lithium-based grease), lubrication cycle 250 working hours, filling amount 1/3-1/2 of the volume

Compatible Models and Assemblies:
Excavator: CAT 320GC, 323GC, 326GC (Boom-Stick, Stick-Bucket Hinge Pin)

Loader: CAT 950M, 962M (Rocker Arm-Tie Rod, Lifting Boom-Frame Hinge)

Compatible Assemblies: Boom Pin Seat, Stick Hinge Hole, Frame Hinge Bracket

Matching Parts: 6U-3003 Bushing, 6V-9570 O-ring, 8T-4125 Elastic Retaining Ring, M8×1.25 Bolts (4 pieces)

Installation and Fitting Points: Clean the mounting holes and bushing surfaces, ensuring no burrs or oil stains. Mounting hole roughness Ra≤1.6μm, bushing surface free of scratches.

Cold press installation, pressure ≤20kN. Flange end face fits snugly against the mounting seat, coaxiality ≤0.03mm. Do not strike the flange.

The interference fit with the mounting hole is 0.010-0.020mm, the clearance with the pin is 0.05-0.08mm, and the runout of the rear end face after installation is ≤0.05mm.

After installation, add grease to ensure the oil groove is full of grease. The installation torque for M8 bolts is 25-30 N·m.