CAT 078-0604 BUSHING

CAT 078-0604 is a Caterpillar original equipment bushing, compatible with 3044C/3054C engines, 306E/307E excavators, 226B3/246B3 skid steer loaders, etc. It is used for radial positioning and vibration damping/wear resistance between the generator rotor shaft and the end cover bearing housing. It is often used in conjunction with the 078-0253 retainer and the 077-8727 bearing (Cat®…).

Core Parameters and Information

Item Details
Part Model: CAT 078-0604 (0780604) Bushing
Structure Type: Cylindrical, with chamfered ends, inner bore with oil groove, suitable for clearance fit installation
Material: Tin bronze CuSn6Zn6Pb3, tin-plated surface, conforms to CAT MES B0302 specification
Key Dimensions: Outer diameter 32 mm, inner diameter 25 mm, length 28 mm, chamfer 0.5×45°, oil groove width 2 mm, depth 0.5 mm, 4 evenly distributed grooves
Performance Parameters: Radial clearance 0.02-0.05 mm, operating temperature -40℃ to +150℃, load capacity 12 MPa, coefficient of friction ≤0.15 (oil lubrication), hardness HB80-100
Compatibility Standard: Compatible with SAE J1926 bearing housing mounting standard, inner bore fit 077-8727 Bearing Outer Ring

Matching Relationship: Compatible with CAT 3044C/3054C engines, 306E/307E excavators, and 226B3/236B3/246B3 skid steer loaders; compatible with 078-0253 retainers and 077-8727 bearings.

Compatible Models and Application Scenarios

Compatible Equipment: Generator end cover bearing housings for CAT 3044C/3054C engines, 306E/307E mini excavators, and 226B3/236B3/246B3 skid steer loaders.

Application Scenarios: Radial positioning of the rotor shaft, vibration reduction and wear resistance, reducing frictional loss between the shaft and bearing housing, suitable for continuous operation of Cat®…

Installation: Press-fit end cover bearing housing, interference fit 0.015-0.03 mm, compatible with bearings and retainers; radial runout ≤0.05 mm after installation.

Installation and Maintenance Points:

Clean the bushing, bearing housing, and journal, checking for deformation and cracks. Ensure the bushing’s outer diameter matches the bearing housing’s inner diameter, and the inner bore is undamaged.

Use a special press to press the bushing into the bearing housing, ensuring the end face is flush with the housing bore without misalignment.

Post-installation inspection: The bushing-journal clearance meets standards, the rotor rotates smoothly without jamming, and radial runout meets requirements.

Maintenance: Check bushing wear and clearance every 1000 hours. Replace immediately if wear exceeds 0.1 mm or clearance exceeds 0.1 mm.