CAT 386-4205 Bearing-Aligning

CAT 386-4205 is a Caterpillar genuine self-aligning alignment bearing, suitable for articulated, oscillating, or drive shaft components in graders, loaders, and excavators that require angle compensation. It is used to withstand radial loads and accommodates installation/operating angle deviations of ±2° – ±5°. The following is precise original part information:

Core Technical Parameters
Item Details
Part Model: CAT 386-4205 (3864205) self-aligning alignment bearing, weighing approximately 0.92 kg (2.03 lb), with a spherical outer ring, a cylindrical inner ring, a cageless integrated structure, and circumferential lubrication grooves and radial oil filling holes.

Core Materials: Outer ring (50Mn alloy steel, tempered hardness HB 280-310, surface hardened HRC 58-62); Inner ring (42CrMo alloy steel, surface plated with nickel-phosphorus alloy for corrosion resistance); Anti-friction layer (copper-lead alloy + … Solid lubricant, coefficient of friction ≤0.07, bonding strength ≥140 MPa

Key Dimensions: Inner diameter 57.15 mm (2.25 in), outer diameter 82.55 mm (3.25 in), total width 38.1 mm (1.50 in), spherical radius 127 mm, lubrication groove width 2 mm, depth 0.5 mm, oil injection hole diameter 4 mm, 3 evenly distributed circumferentially

Rated Parameters: Rated radial dynamic load 150 kN, rated radial static load 300 kN, suitable temperature -35℃ to +120℃, coefficient of friction (oil lubrication) ≤0.05, suitable swing angle ±30°, permissible angle deviation ±3°, suitable pin diameter 57.15 mm

Suitable Operating Conditions: Medium to heavy load with angular deviation swing / Rotating parts, suitable for dusty, vibrating, and impact conditions, used in grader drawbar joints, loader boom hinges, and excavator stick pins. Bears radial loads and can withstand slight bidirectional axial loads.

Compatible Models: CAT 140M/160M graders (drawbar to frame hinge), 966K/972K loaders (boom lower hinge), 320GC excavators (stick to boom connection), 420F2 loaders (steering link joint)

Accessories: Compatible pins 386-4204, grease nipples 1U-8878, retaining rings 5K-8591, installation tools 107-7775 (83 mm pressure head)

Core Functions and Structural Features:
Angle Self-Adjustment: Spherical outer ring design automatically compensates for installation coaxiality errors and angular offsets during operation, avoiding edge contact wear and adapting to the swing requirements of hinged parts.

Reliable Lubrication: Circumferential lubrication grooves and radial oil injection holes ensure even grease distribution, suitable for long-term oscillating conditions and reducing friction and wear.

Strong Load Capacity: Alloy steel inner and outer rings provide high rigidity, while the copper-lead anti-friction layer is suitable for medium to heavy loads, capable of withstanding impact loads and reducing deformation and vibration.

Flexible Installation: Cage-free integrated structure allows for press-fitting at room temperature, facilitating quick on-site maintenance and minimizing downtime.

Good Compatibility: Compatible with mineral oils and synthetic greases, suitable for common temperatures and operating conditions, offering high versatility.