CAT 9R-4761 16mm Inner Diameter Sleeve Bearing

CAT 9R-4761 is a Caterpillar original single-row tapered roller bearing, commonly used in wheel loaders, excavators, and other equipment in the hubs, drive axles, or gearboxes. It is suitable for radial and combined axial load conditions. The following is precise original part information:

Core Technical Parameters
Item Details
Part Model: CAT 9R-4761 (9R4761) Single-row tapered roller bearing, weight approximately 1.2 kg (2.65 lb), suitable for low to medium speed, combined radial and axial load conditions (Cat)

Core Material: Bearing steel (high carbon chromium bearing steel), outer ring, inner ring, and rollers are hardened, surface hardness HRC 60-64, cage is made of stamped steel plate, wear-resistant and fatigue-resistant (Cat)

Key Dimensions: Inner diameter 70 mm (2.756 in), outer diameter 125 mm (4.921 in), width 32 mm (1.260 in), cone angle 12°15′, suitable shaft diameter 70 mm (tolerance h6), bearing housing bore tolerance H7 (Cat)

Structural Features: Single-row tapered roller structure, outer ring with sealing groove, can be equipped with double-lip seals, cage guides the rollers for smooth operation, suitable for radial and bidirectional axial loads, can withstand certain impact loads, suitable for wheel hubs and differentials (Cat)

Compatible Models: CAT 938G loader (front wheel hub), 312C excavator (travel drive axle), 416D backhoe loader (rear drive axle), etc. (Cat)

Accessories: Suitable bearing housing 9R-4762, lock nut 8T-4127, oil seal 436-7781

Core Functions and Structural Features:

Combined Load Adaptation: Tapered roller structure, can simultaneously withstand large radial loads (dynamic load approximately 112 kN, static load approximately 148 kN) and bidirectional axial loads, suitable for wheel hubs, drive axles, and other composite stress components, ensuring stable power transmission and smooth equipment operation (Cat).

**Sealing Protection:** The outer ring features a sealing groove, which, when used with a dedicated oil seal, effectively prevents dust, mud, and other impurities from entering the bearing, making it suitable for long-term operation under harsh conditions in construction machinery.

**Stable Installation:** The compact structure of the stamped steel cage ensures smooth roller operation after installation, suitable for low-to-medium speed (≤1800 rpm) conditions, reducing vibration and noise, and improving equipment smoothness.

**Durable and Fatigue-Resistant:** Made of high-carbon chromium bearing steel, quenched and tempered, it exhibits excellent fatigue resistance, suitable for the high-frequency, heavy-load working environment of construction machinery.

**Installation and Maintenance Points:**
**Installation Specifications:** Clean the journal and bearing housing bore, removing burrs and oil. Before installation, the bearing can be heated to 80-100℃ for hot mounting, or cold-pressed in using a dedicated press, ensuring a close fit between the bearing end face and the shaft shoulder.

**Stable Installation:** The journal surface roughness Ra≤0.4 μm, hardness≥HRC 58, and the radial clearance of the bearing after installation is 0.020-0.04 mm, ensuring smooth operation.

After installation, inject an appropriate amount of grease. During trial operation, there should be no jamming or abnormal noise, and the bearing temperature should be normal with no abnormal temperature rise.

Maintenance Recommendations:
Check the bearing seal and lubrication every 500 working hours and replenish grease. Each replenishment should be just enough to cause a small amount of grease to overflow from the seal; avoid excessive grease to prevent bearing overheating.

Regularly check the bearing’s operating noise and temperature. If any abnormalities are found, stop the machine immediately for inspection to prevent bearing damage and equipment failure.