CAT 078-0108 RETAINER

CAT 078-0108 is a Caterpillar original equipment retainer, compatible with 3044C/3054C engines, 306E/307E excavators, 226B3/246B3 skid steer loaders, etc. It is used for axial positioning and anti-migration of the generator rotor shaft end, and is often used in conjunction with 077-8727 bearings and 078-0007 retainers (Cat®…).

Core Parameters and Information

Item Details
Part Model: CAT 078-0108 (0780108) Fixture

Structure Type: Annular with locating flange, central shaft hole + 3 evenly distributed mounting holes, bolt fastening type

Material: 40Cr alloy steel, galvanized and passivated surface, conforming to CAT MES J4203 specification

Key Dimensions: Outer diameter 85 mm, inner diameter 28 mm, thickness 12 mm, locating flange height 3.5 mm, mounting hole diameter 6.5 mm, hole spacing circle diameter 65 mm, compatible with M6.5 bolts

Performance Parameters: Axial locking force 6 kN, operating temperature -40℃ to +180℃, radial runout ≤0.05 mm, hardness HRC32-38

Compatibility Standard: Compatible with SAE J1926 rotor connection standard, central hole compatible with 077-8727 bearing inner ring

Matching Relationship: Compatible with Compatible with CAT 3044C/3054C engines, 306E/307E excavators, and 226B3/236B3/246B3 skid steer loaders, and equipped with 077-8717 retaining rings and 078-0007 securing devices.

Compatible Models and Application Scenarios

Compatible Equipment: Cat® generator rotors for CAT 3044C/3054C engines, 306E/307E mini excavators, 226B3/236B3/246B3 skid steer loaders, and some small wheel loaders…

Application Scenarios: Anti-mold protection for rotor shaft end movement, suppressing vibration displacement, ensuring stable power output, suitable for continuous operation.

Installation: Secure to the rotor shaft end flange with M6.5 bolts, torque 10-12 N·m, compatible with bearings and drive plates. Axial clearance ≤0.1 mm after installation.

Installation and Maintenance Points:

Clean the shaft end, retainer, and bolts. Check for deformation and cracks. Ensure the shaft end diameter matches the center hole and the mounting holes are undamaged.

Align the positioning flange with the rotor flange face and the mounting holes. Tighten the bolts crosswise, ensuring no misalignment.

Post-installation inspection: Check for looseness and wobble. Ensure rotor rotation is smooth and free of interference. Use a multimeter to measure rotor resistance; no abnormalities should be found.

Maintenance: Every 800 hours, check bolt torque and retainer wear. Replace immediately if deformed or with damaged threads.