CAT 586-1793 General Duty Bearing Group

CAT 586-1793 YM (Yellowmark) is a double-row tapered roller bearing assembly manufactured by a Caterpillar-authorized aftermarket brand. It integrates the inner ring, outer ring, rollers, and cage, and is suitable for the drive axle, gearbox, or swing mechanism of Cat excavators/loaders. It is used to withstand high radial and bidirectional axial combined loads and is a key load-bearing component under heavy-duty conditions. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes Model 586-1793 (Yellowmark brand), double row tapered roller bearing assembly, single weight approximately 12.5 kg, suitable shaft diameter φ85 mm, outer ring with mounting flange, built-in preload adjusting shim, single unit usage 1 piece, operating temperature -40℃ to +120℃

Key Dimensions Inner diameter φ85 mm (tolerance P6: +0.015~+0.030 mm), outer diameter φ180 mm (tolerance G6: -0.012~+0.008 mm), total width 65 mm (including flange), flange diameter φ210 mm, flange thickness 12 mm, mounting holes 6×φ14 mm (evenly distributed, hole spacing φ190 mm), roller cone angle 15°, inner and outer ring raceway contact angle 28°

Material and Process Inner ring / Outer ring The rollers are made of chromium-molybdenum alloy steel (equivalent to 52100 bearing steel), the cage is made of stamped steel plate, surface carburized and quenched (HRC 60-64, hardened layer depth 2.0-2.5 mm), the outer ring flange surface is galvanized and passivated, and the roller surface is ultra-precision ground (Ra≤0.05 μm).

Performance Parameters: Rated dynamic load Cr≥420 kN, rated static load C0r≥580 kN, limiting speed 2800 rpm (grease lubrication), recommended preload 15-25 kN, compatible bearing housing bore tolerance H7, journal tolerance m6, lubrication method is grease lubrication (recommended Cat 1U-8888 extreme pressure lithium-based grease).

Compatible Models: Compatible with Cat 320D2/323/326 excavators, 950/966 The drive axle main reducer, gearbox output shaft, or slewing bearing pinion shaft of a loader are commonly installed at both ends of the differential or on the planetary carrier support.

Installation and Maintenance Points:
* **Cleaning and Inspection:** Before installation, thoroughly clean the bearing housing bore and journal to remove burrs, oil, and rust. Inspect the inner and outer rings of the bearing for cracks and for any jamming of the rollers. Measure the dimensions of the journal and housing bore to ensure tolerances are within m6/H7.

**Preload Adjustment:** This assembly includes three sets of adjusting shims with thicknesses of 0.1/0.2/0.3 mm. During installation, control the bearing preload by increasing or decreasing the number of shims. After preload, the axial movement should be ≤0.05 mm to avoid over-preload leading to overheating or under-preload causing impact wear.

**Installation and Maintenance Points:**
* **Cleaning and Inspection:** Before installation, thoroughly clean the bearing housing bore and journal to remove burrs, oil, and rust. Press-fit specifications: Use a dedicated bearing press, applying force evenly to the outer ring end face. Do not strike the inner ring or rollers. After press-fit, use a dial indicator to check radial runout (≤0.03 mm) and end face runout (≤0.02 mm).

Lubrication: Before press-fit, apply sufficient grease to the raceway and roller surfaces. After installation, replenish grease through the grease nipple on the bearing end cap. It is recommended to check the grease condition every 500 hours; replace immediately if it becomes black or contains impurities.