CAT 571-2073 Bearing-Ball

CAT 571-2073 is a Caterpillar original single-row radial deep groove ball bearing (single seal), suitable for the drive wheel shaft/gearbox input shaft of Cat PM620/PM622/PM820/PM825/PM822 milling machines. It is used for low-friction support under predominantly radial loads, suppressing radial runout of the shaft system, ensuring transmission accuracy and dustproof sealing. The following is a professional technical and application guide:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 571-2073, Type: Single-row radial deep groove ball bearing (single-sided with contact rubber seal), Suitable for Cat PM series milling machine drive wheel shafts and gearbox input shafts, Material: Chromium bearing steel (SUJ2/SAE 52100, HRC 60-64), Inner diameter φ60 mm (tolerance 0/-0.013 mm), Outer diameter φ110 mm (tolerance 0/-0.018 mm), Width 22 mm (tolerance…) ±0.1 mm), single weight approximately 0.78 kg, rated dynamic load Cr 62.5 kN, rated static load Cor 35.2 kN, maximum speed for grease lubrication 4500 RPM, maximum speed for oil lubrication 5600 RPM, operating temperature -30℃ to +120℃, sealing type is single-lip contact rubber seal (nitrile rubber NBR, dustproof and waterproof IP65), cage is stamped steel plate (SPCC), ball diameter φ10 mm, number of balls 12, contact angle 0° (pure radial)

Key dimensions: chamfer r1/r2=1.5 mm (tolerance ±0.2 mm), radial clearance C3 group (0.015-0.035 mm), sealing lip interference 0.1-0.15 mm, bearing end face runout ≤0.012 mm, radial runout ≤0.008 mm, surface roughness Ra≤0.4 μm, compatible shaft diameter φ60 mm (tolerance h6), bearing housing bore diameter φ110 mm (tolerance H7)

Material and Manufacturing Process: Bearing steel quenched + low-temperature tempered (martensitic structure, retained austenite ≤5%), cage formed by stamping + spot welding, single-lip NBR seal (resistant to mineral oil/grease, temperature resistance -30℃ to +120℃), filled with lithium-based grease (NLGI 2, base oil viscosity ISO VG 32), dust cover made of cold-rolled steel plate + electrophoretic coating, rust prevention level ≥96 hours neutral salt spray

Compatible Models: Cat PM620/PM622/PM820/PM825/PM822 road milling machines. Core components include drive wheel axle support, gearbox input shaft positioning, and hydraulic pump drive shaft end. Suitable for continuous radial load ≤40 kN and instantaneous impact ≤60 kN conditions. Suppresses shaft radial runout, ensures transmission accuracy, and the sealing design prevents dust/asphalt debris from entering during milling operations.

Assembly and Fit The shaft is press-fitted (0.010-0.015 mm, heat fitting temperature 80-100℃), and the bearing housing is clearance-fitted (0.012-0.025 mm). After installation, axial positioning uses a combination of an 186-8990 outer retaining ring and a shaft shoulder. Radial runout ≤0.01 mm. The sealing lip contact pressure with the shaft is 0.2-0.3 MPa. Installation and Maintenance Points: Before installation, clean the journal and bearing housing bore. Check the bearing for rust/cracks/jamming. Measure the shaft diameter and housing bore tolerances, confirming the press-fit/clearance is compliant and the sealing lip is undamaged.

During assembly, heat the bearing to 80-100℃ using an induction heater (flame heating is strictly prohibited). Quickly slide the bearing onto the journal and ensure it fits snugly against the shoulder. After cooling, check the axial clearance with a 0.02-0.05 mm feeler gauge. Install the retaining ring to secure it, and finally add lithium-based grease (fill to 1/3-1/2 of the bearing cavity).

Maintenance Recommendations: Check the bearing temperature (≤80℃) and any abnormal noises every 500 hours. Add grease every 1000 hours. Replace the bearing immediately if abnormal temperature rise, seal damage, or radial clearance >0.06 mm occurs to prevent shaft wear or seizure.