Description
CAT 191-2570 Bearing – Needle(Debris Resistant)
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The CAT 191-2570 is a Caterpillar original radial needle roller + cage roller assembly for heavy-duty parts (such as planetary gears, idler gears, connecting rods) with housing bores and shafts as raceways. It is compatible with the gearboxes and drive axles of Cat excavators/loaders, and features high radial load capacity and a compact cross-section. It weighs approximately 0.62 kg and only one piece is used per unit. The following is professional structured information:
Core Technical Parameters (Professional Version)
Item Details
Basic Attributes Model 191-2570, Radial Needle Roller Cage Assembly, Fitting Shaft Diameter φ50 mm (Tolerance m6: +0.025/+0.050 mm), Housing Bore Inner Diameter φ70 mm (Tolerance H7: +0.030/+0.060 mm), Operating Temperature -40℃ to +120℃, Rated Speed 3000 rpm (Grease Lubricated)
Key Dimensions Needle Roller Diameter φ5 mm, Needle Roller Length 28 mm, Cage Inner Diameter φ50 mm, Cage Outer Diameter φ68 mm, Assembly Total Width 30 mm, Number of Needles 24 (Evenly Distributed), Cage Pocket Diameter φ5.1 mm (Tolerance +0.020/+0.040 mm), Chamfer at Both Ends C1 mm
Material and Process Needle Roller Material GCr15 Bearing Steel (HRC) 62-64 (hardened layer depth 1.5-2.0 mm), cage made of 08F low carbon steel stamping, surface phosphated (film thickness ≥5 μm, salt spray test ≥24 h), needle roller surface roughness Ra≤0.08 μm, cage pocket inner wall Ra≤1.6 μm
Performance parameters: Rated radial dynamic load Cr≥85 kN, rated static load C0r≥120 kN, allowable axial runout ≤0.2 mm, lubrication method: Cat 1U-8888 extreme pressure lithium-based grease, protection rating: IP54 (compatible with end cap seal)
Compatible models: Excavators 320D2/323/326, loaders 950/966, compatible positions: gearbox second shaft idler gear, drive axle planetary carrier raceway, hydraulic pump gear shaft needle roller bearing seat, common matching bearing end caps. 5T-6062
Installation and Maintenance Points:
**Before installation, clean the journal and housing bore (free from burrs/scratches). Measure the shaft diameter and bore diameter tolerances to ensure they meet the m6/H7 fit requirements.** Check that the needle rollers are free from rust, the cage is free from deformation, and that the needle rollers rotate freely without jamming.
Assembly Specifications: Use a special fixture to evenly press the cage assembly into the housing bore. The pressing force should be ≤5 kN. Do not strike the needle rollers or cage. After pressing, use a dial indicator to check that the radial runout is ≤0.05 mm and the end face runout is ≤0.03 mm.
Lubrication Requirements: Apply sufficient grease to the raceway and needle roller surfaces before pressing. After installation, replenish the grease through the grease filler. It is recommended to check the grease condition every 500 hours. Replace the grease immediately if it becomes black or contains impurities.
Maintenance cycle: Check the tightness of the components every 1000 hours. If the needle rollers are worn (diameter decrease ≥0.1 mm) or the cage is deformed, the whole assembly must be replaced. Avoid overloading or uneven loading to prevent needle roller breakage.
