CAT 374-8359 BEARING-SLV-GD

CAT 374-8359 YM is a heavy-duty straight-sleeve sleeve bearing suitable for Caterpillar medium and large excavators/loaders. It emphasizes high wear resistance and compatibility. The core information is as follows:

Core Technical Parameters

Item Details
Part Model: CAT 374-8359 (3748359) YM Straight-Sleeve Heavy-Duty Sleeve Bearing (Suitable for medium and large machine working devices/chassis hinge points, bearing radial loads + low-speed oscillation, compatible with pin 374-8358)

Core Material: 20CrMnTi carburized steel, surface carburized and quenched, hardness HRC 58–62, carburized layer depth 1.1–1.4 mm, 3 axial lubrication grooves in the inner hole, compatible with NLGI 2 lithium-based grease

Key Dimensions: Inner diameter 85 mm, outer diameter 105 mm, length 70 mm, wall thickness 10 mm, inner hole roundness tolerance ≤0.01 mm, mounting surface perpendicularity tolerance ≤0.02 mm
Single weight: Approx. 3.12 kg (6.88 lb)
Compatible models: CAT 374D/374F/390F excavators (boom/stick hinge), 980M/982M loaders (bucket pin), matching seal ring 374-8360
Operating compatibility: Rated radial load 180 kN, limiting speed 600 rpm, operating temperature -40℃ to +140℃, suitable for low-speed heavy-duty oscillating conditions
Core functions and structural features:
Heavy-duty wear-resistant: Carburized steel surface hardening treatment, impact load resistance up to 220 kN, suitable for heavy-duty oscillating forces of boom/stick pins, service life up to 6500 hours or more.

Optimized lubrication: 3 axial lubrication grooves in the inner hole ensure uniform grease distribution, reduce the coefficient of friction (f≤0.08), and reduce adhesive wear between pins and bushings. Precise Fit: The clearance with the 374-8358 pin is 0.02–0.03 mm, ensuring smooth and unobstructed movement.

Deformation Resistance Enhancement: Integral forging and precision grinding ensures uniform wall thickness (tolerance ±0.01 mm), preventing deformation under heavy loads.

Installation and Maintenance Points
Installation Specifications: Clean the mounting hole. Hole tolerance +0.01–+0.02 mm. Cold press-fit with a pressing force of 15–18 kN. Do not strike the end face.

After installation, check the inner hole roundness to be ≤0.01 mm and the clearance with the 374-8358 pin to be 0.02–0.03 mm.

Secure with M16×1.5 bolts (grade 10.9) with a torque of 100–105 N・m to prevent axial movement.

Maintenance Recommendations:

Inspect for wear, cracks, and grease leakage every 600 working hours. Replace if inner diameter wear exceeds 0.2 mm.

Add 35–45 g of NLGI 2 lithium-based grease each time, ensuring the lubrication grooves are full.

Replace pin 374-8358 and seal ring 374-8360 simultaneously to ensure sealing and lubrication.