CAT 050-8785 BEARING

CAT 050-8785 is a genuine Caterpillar deep groove ball bearing (purely original and accurate information, no additional description). It is suitable for hydraulic pump spindles, fan drive shafts, or gearbox input shafts in C7/C9 engines, 320D/323D excavators, 950H/966H loaders, and other equipment. It is used in conjunction with 039-8729 shaft retaining rings, 039-8914 bearing caps, and 038-7406 bearing housings for radial support and rotary guidance under high-speed, low-load conditions, ensuring smooth operation of transmission components.

Core Parameters and Information

Item Details
Part Model: CAT 050-8785 (0508785) Deep Groove Ball Bearing

Type: Single row, open design, primarily for radial loads, allows for a small amount of bidirectional axial loads

Material: High carbon chromium bearing steel (GCr15), hardened (HRC60-64), outer ring surface anodized black for corrosion protection

Key Dimensions: Inner diameter 70 mm, outer diameter 110 mm, width 20 mm, weight 0.48 kg, radial clearance C3 group (0.012-0.028 mm)

Load Capacity: Radial rated dynamic load 42.8 kN, radial rated static load 29.2 kN, limiting speed 6000 rpm (grease lubrication)

Applicable Temperature: -40℃ ～ +120℃, suitable for engine compartment and hydraulic system temperature environments

Accuracy Class: Complies with ISO 492 standard, dimensional tolerance ±0.01 mm, rotational accuracy P0 Grade 1, meeting the high-speed rotation requirements of construction machinery.

Lubrication Method: Pre-filled lithium-based grease, grease filling amount 30% – 40%, suitable for long-term lubrication conditions.

Compatible Models and Assemblies

Compatible Parts: CAT 039-8729 shaft retaining ring, 039-8914 bearing cap, 038-7406 bearing housing, 038-7407 sealing ring

Compatible Equipment: CAT 320D/323D excavators, 950H/966H loaders, D6R bulldozers, etc., equipped with C7/C9 engines, used for radial support and positioning of hydraulic pump input shaft, fan pulley shaft, gearbox secondary shaft, etc.

Matching Parts: 050-8785 deep groove ball bearing, 039-8729 shaft retaining ring, 039-8914 bearing cap, 038-7406 bearing housing, 038-7407 Sealing Ring Installation and Maintenance Points: Before installation, clean the bearing, journal, and bearing housing bore, ensuring they are free of burrs, oil, and rust. Check the bearing for damage and ensure it rotates freely without jamming.

Use the cold-press method for installation. Apply even pressure to the inner ring end face using a special sleeve. Do not strike the outer ring. After installation, ensure the bearing end face fits snugly against the shaft shoulder, with no axial clearance.

After installation, check that the radial clearance meets C3 requirements, there is no interference between rotating parts, and there is no leakage at the seal.

Maintenance: Check bearing lubrication and temperature every 2000 working hours. Replace the bearing immediately if the temperature is abnormal (>80℃) or if there are unusual noises to prevent damage.