CAT 126-5678 BUSHING

CAT 126-5678 (1265678) is a Caterpillar genuine steel bushing used at hinge points and pin joints, providing support, wear reduction, and positioning. The following is purely precise information (no additional description): Cat®…

Core Parameters and Information

Item Details
Part Model: CAT 126-5678 Steel Bushing

Part Type: Fixed radial support bushing, suitable for pin hinge structures, withstands radial loads, absorbs impact vibrations, and reduces component wear

Material: 40Cr alloy structural steel, overall tempered hardness HRC 28-32, inner hole surface hardened hardness HRC 58-62, surface anodized black for rust prevention

Key Dimensions: Inner diameter 38.10 mm (1.500 in), outer diameter 50.80 mm (2.000 in), total length 50.80 mm (2.000 in), inner hole chamfered 1×45°, parallelism of both ends ≤0.01 mm

Structural Features: Straight cylindrical oil-groove-free structure, flat ends, internal hardened and reinforced, suitable for interference fit installation, used at the hinge joint between pin and bracket.

Compatible Structures: Excavator stick and connecting rod hinge bushing, loader boom and rocker arm hinge bushing, grader blade bracket hinge bushing, road roller vibratory wheel bracket hinge bushing.

Applicable Working Conditions: Suitable for -40℃ to 120℃, radial load ≤12 kN, suitable for low-speed oscillation (≤10 rpm) and intermittent impact conditions.

Compatible Models and Assemblies:

Excavators: CAT 320GC, 323GC (stick hinge assembly, boom and connecting rod hinge assembly)
Loaders: CAT 950M, 962M (boom and rocker arm hinge assembly, steering tie rod hinge assembly)
Graders: CAT 140M, 160M (Blade bracket hinge assembly, drawbar hinge assembly)
Road Roller: CAT CS66B, CS76B (Vibratory wheel bracket hinge assembly, steering bracket hinge assembly)
Compatible Assemblies: 320GC boom hinge bushing assembly, 950M boom rocker arm hinge bushing assembly, 140M blade bracket hinge bushing assembly
Installation and Fitting Points:
The bushing and mounting hole should have an interference fit, with an interference amount of 0.015-0.025 mm. Cold fitting or press fitting should be used, with a pressure ≤80 kN.

Before installation, clean the inner hole of the bushing and the mounting hole, ensuring there are no burrs, oil stains, or rust. Check that the hardened layer of the inner hole is free of peeling or cracks.

After installation, the bushing end face should be flush with the mounting surface, with a coaxiality ≤0.02 mm. The clearance between the pin and the bushing should be 0.020-0.040 mm, and there should be no jamming during swing.

After installation, apply grease (CAT TO-4 grade) to the mating area between the bushing and the pin to ensure adequate lubrication.