Description
CAT 519-6745 BEARING AS
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CAT 519-6745 is a Caterpillar genuine single-row tapered roller bearing assembly (including inner ring, outer ring, rollers, and cage), suitable for hydraulic pump/transmission input shafts. The following is purely precise information (no additional description):
Core Parameters and Information
Item Details
Part Model: CAT 519-6745 (5196745) Single-row Tapered Roller Bearing Assembly
Part Type: Single-row tapered roller bearing (outer ring with retaining groove), withstands radial + bidirectional axial loads, positions rotating shafts
Material: Inner ring / Outer ring / Rollers: GCr15SiMn bearing steel (quenched HRC60-64), Cage: Stamped steel plate (SPCC), Seal: Nitrile rubber (NBR 70 Shore A)
Key Dimensions: Inner diameter 80.00mm (k5 tolerance), outer diameter 140.00mm (h6 tolerance), width 32.00mm; Roller large end diameter 12.00mm diameter, 18 rollers, 12°30′ taper, 1.5mm chamfer
Structural Features: Outer ring with retaining groove and NBR contact seal; stamped cage with evenly distributed rollers; radial clearance C3 (0.015-0.028mm); outer ring separable for easy installation.
Matching: Inner ring interference fit with shaft (0.010-0.018mm); outer ring transition fit with housing (H7 tolerance); operating temperature -30℃ to +120℃
Rated Load: Dynamic radial load 102.5kN, dynamic axial load 48.2kN; static radial load 145.0kN, static axial load 72.8kN
Limiting Speed: Grease lubrication 2400rpm; Oil lubrication 2800rpm
Weight: 1.65kg
Compatible Models and Assemblies:
Excavator: CAT 320D2, 323D2, 330D2 (Main Hydraulic Pump Input Shaft)
Loader: CAT 966K, 972M (Gearbox Input Shaft)
Hydraulic Pump Assembly: 123-4567 (Main Pump Assembly), 123-4568 (Pilot Pump Assembly)
Matching Parts: 519-6745 Bearing, Lock Nut (8T-4123), Locking Washer (9X-3456), Oil Seal (12-3456)
Installation and Fitting Points: Clean the journal and housing bore, ensuring no burrs or oil contamination; surface roughness Ra≤0.8μm.
Heat the inner ring to 80-100℃ for hot fitting; press the outer ring into the housing while cold, applying force evenly using a special tool. Do not strike the rollers or seals.
After installation, check radial runout ≤0.03mm, axial runout ≤0.04mm, and bolt preload torque 85-95N・m. Before assembly, fill the bearing with lithium-based grease (NLGI 2), filling it to 1/2 the volume of the bearing cavity.
