CAT 077-3080 BEARING

CAT 077-3080 is a Caterpillar genuine fuel pump tappet shaft support bearing (purely genuine and accurate information, no additional description). It is compatible with the high-pressure common rail fuel pump tappet assembly of C13/C15/C18 engines. It works in conjunction with the 077-2844 sealing bushing, 077-2965 retainer, and 069-5112 bushing. It provides radial support and rotary guidance for the tappet shaft, withstands reciprocating loads and radial forces, ensures tappet movement accuracy, and prevents shaft vibration and uneven wear.

Core Parameters and Information

Item Details
Part Model: CAT 077-3080 (0773080) Tappet Shaft Support Bearing

Structure Type: Single row deep groove ball bearing with dust cover, outer ring interference fit, inner ring and shaft clearance fit

Material: Inner ring / Outer ring: Chromium steel GCr15 (quenched HRC60-64, surface ground); Rolling elements: Chromium steel GCr15 (quenched HRC62-66); Cage: Reinforced nylon PA66; Dust cover: Nitrile rubber NBR; Weight: 0.078 kg

Key Dimensions: Inner diameter 22 mm, outer diameter 42 mm, width 12 mm, chamfer 1×45°, radial clearance 0.008-0.015 mm

Performance Parameters: Rated dynamic load 12.8 kN, rated static load 6.5 kN, limiting speed 8000 r/min, operating temperature -40℃ to 120℃, fatigue life ≥3×10⁶ cycles

Compatibility Standard: Complies with CAT 4W-7023 bearing technical specifications, inner and outer diameter tolerance ±0.01 mm, roundness ≤0.002 mm

Compatible Models and Assemblies

Compatible Parts: 077-2844 sealing bushing, 077-2965 retainer, 069-5112 bushing, 068-8555 retaining ring

Compatible Equipment: CAT 336D2L/349D2L excavators, 980M/982M loaders, D8T/D9R bulldozers (C13/C15/C18 engines), for radial support of high-pressure common rail fuel pump tappet shafts

Matching Installation: 1 tappet shaft per unit The component is press-fitted into the pump body bearing bore. The outer ring has an interference fit with the bore, while the inner ring has a clearance fit with the tappet shaft, providing stable rotational guidance.

Installation and Maintenance Points:

Clean the bearing, pump body bore, and tappet shaft. Check the bearing for deformation, cracks, and damage to the dust cover. The surface roughness Ra should be ≤1.6 μm, and the flatness ≤0.01 mm.

Cold press-fit the outer ring (press-fitting force 8-10 kN), ensuring the outer ring end face is flush with the pump body bore end face. The bearing should rotate freely without jamming, and the radial clearance should meet the standard.

After installation, check that the tappet shaft radial runout is ≤0.01 mm, there is no abnormal temperature rise at the bearing, and the tappet reciprocating motion is smooth and without abnormal noise.

Maintenance: Check the bearing clearance every 2000 hours (replace when >0.03 mm), and simultaneously check the dust cover sealing performance to prevent impurities from entering and causing wear.