CAT 609-3781 140.415mm Outer Diameter Straight Sleeve Bearing

CAT 609-3781 is a straight sleeve bearing designed by Caterpillar specifically for the balance beam, rocker arm, and steering knuckle of heavy-duty equipment such as the D10/D11 series heavy-duty tracked bulldozers and 992 series loaders. It is used to withstand heavy radial loads and low-speed oscillating loads, and features high wear resistance, impact resistance, and fatigue resistance. The following are the core information:

Core Parameters
Item Details
Basic Attributes
Model 609-3781, straight flangeless sleeve bearing, suitable for the oscillating/rotating mechanisms of heavy-duty equipment, used for positioning shafts, bearing radial loads, preventing direct friction between the shaft and mounting holes, suitable for low-speed conditions (linear speed ≤ 0.5m/s)

Compatible Models
Caterpillar D10T/D10R, D11T/D11R heavy-duty tracked bulldozers, 992G/992K wheel loaders, suitable for balance beam pins, steering clutch shafts, rocker arm shafts, etc.

Material and Process
Material is high-density powder metallurgy steel (P/M Steel, oil-lubricated, surface hardened (hardness HRC 58-62), possessing wear resistance and anti-galling properties; operating temperature -30℃ to +120℃, no additional lubrication required (regular grease replenishment can extend life).

Key Dimensions: Inner diameter 101.60mm (4.00in), outer diameter 140.415mm (5.528in), width 76.20mm (3.00in), weight approx. 4.8kg, mounting hole tolerance H7 (+0.04mm~+0.06mm), shaft clearance 0.08-0.12mm

Functional Parameters: Radial rated load 1200kN, fatigue life ≥5000 hours, compatible pin diameter 101.60mm, installation method is interference fit (interference 0.05-0.08mm), self-lubricating, suitable for harsh working conditions such as dust and impact.

Matching Components: Compatible pin. For bearings 101-6070 and 152-8071, installation requires a dedicated press-fit fixture (pressure ≥100kN). It is recommended to use with anti-loosening washers.

Installation and Maintenance Points:

Preparation before installation: Clean the mounting hole and bearing outer surface, removing burrs and oil; check the bearing for cracks and deformation; measure the mounting hole diameter and bearing outer diameter to ensure the interference fit is within specifications; use a hydraulic press-fit machine or dedicated press-fit fixture; do not strike the bearing end face.

Installation steps: Apply a small amount of grease to the bearing outer surface and press it smoothly into the mounting hole (press-fitting force ≥80kN), ensuring the bearing end face is flush with the mounting hole end face; install the pin, ensuring the shaft and bearing coaxiality is ≤0.05mm; install the retaining ring to fix the bearing and prevent axial movement.

Maintenance and replacement: Check the bearing clearance every 1500 hours (replace when the radial clearance is ≥0.25mm). Replace the bearing immediately if it shows wear, peeling or abnormal noise. Regularly (every 500 hours) replenish lithium-based grease (NLGI 2) through the grease nipple, adding about 5g each time.