CAT 068-4378 BEARING

CAT 068-4378 is a Caterpillar genuine fuel pump camshaft needle roller bearing (purely genuine and accurate information, no additional description). It is compatible with the high-pressure common rail fuel pump camshaft of C13/C15/C18 engines, supporting high-speed camshaft rotation, reducing friction, and precisely transmitting power. This ensures stable plunger reciprocation and fuel injection timing, preventing camshaft runout and wear that could lead to fuel pump failure (Cat®…).

Core Parameters and Information

Item Details
Part Model: CAT 068-4378 (0684378) Camshaft Needle Roller Bearing

Structure Type: Full complement needle roller bearing (without cage), outer ring with locating shoulder, inner ring is camshaft journal, dust lips at both ends, mounting holes for adapters

Material: Needle rollers: High carbon chromium bearing steel (GCr15, HRC62-65, ultra-fine ground surface Ra≤0.02 μm); Outer ring: Bearing steel (hardness HRC58-62); Dust lip: Nitrile rubber (NBR, oil resistant -40℃ to 120℃); Weight: 0.065 kg

Key Dimensions: Inner diameter 25 mm, outer diameter 35 mm, width 12 mm, locating shoulder diameter 38 mm, needle roller diameter 2 mm, number of needle rollers 15, chamfer at both ends 0.5×45°

Performance Parameters: Rated radial dynamic load 52 kN, rated static load 78 kN kN, maximum speed 8000 rpm, operating temperature -40℃ to 150℃, clearance 0.002-0.004 mm, fatigue life ≥10⁷ cycles

Compatibility Standard: Complies with ISO 3096 needle roller bearing standard, radial runout ≤0.003 mm, needle roller parallelism ≤0.002 mm

Compatible Models and Assemblies

Compatible Parts: 10R-2465 camshaft, 067-7785 camshaft bearing assembly, 067-7842 plunger, 068-2742 tappet retainer

Compatible Equipment: CAT 336D2/349D2 excavators, 980K/982M loaders, D8T/D9T bulldozers (C13/C15/C18 engines), for fuel pump camshaft support Cat®…

Matching Installation: 4 per camshaft The components are symmetrically distributed at the corresponding positions on the tappets, working in conjunction with the 068-2742 retainer to ensure precise contact between the camshaft and the tappets.

Installation and Maintenance Points:

Clean the bearing mounting holes and camshaft journals. Check for broken needle rollers, undeformed outer rings, and intact dust lips. The roundness of the mounting holes should be ≤0.003 mm, and the surface roughness Ra ≤1.6 μm.

Use a dedicated pressing tool (075-2348) to press the bearing into the mounting hole. The pressing force should be ≤5 kN, ensuring the outer ring shoulder fits snugly against the mounting surface without looseness or misalignment.

After installation, test the camshaft rotation for smooth rotation. The radial clearance should be 0.002-0.004 mm, and there should be no abnormal noise at high speeds. The lubrication pressure should be ≥0.3 MPa, with no leakage.

Maintenance: Check bearing wear every 2000 hours (replace when needle roller radial wear ≥0.005 mm). Regularly change the engine oil and fuel filter to prevent impurities from entering and causing needle roller wear and outer ring cracking.