CAT 078-0253 RETAINER

CAT 078-0253 is a Caterpillar original equipment retainer, compatible with 3044C/3054C engines, 306E/307E excavators, and 226B3/246B3 skid steer loaders, etc. It is used for axial positioning of the generator stator and end cover, preventing vibration and loosening. It is often used in conjunction with 078-0007/078-0108 retainers and 077-8727 bearings.

Core Parameters and Information

Item Details
Part Model: CAT 078-0253 (0780253) Fixture

Structure Type: Annular with positioning step, central through hole + 3 evenly distributed mounting holes, bolt fastening type

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

Key Dimensions: Outer diameter 92 mm, inner diameter 32 mm, thickness 14 mm, positioning step height 4 mm, mounting hole diameter 7 mm, hole spacing circle diameter 70 mm, compatible with M7 bolts

Performance Parameters: Axial locking force 7 kN, operating temperature -40℃ to +180℃, radial runout ≤0.05 mm, hardness HRC32-38

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

Matching Relationship: Compatible with 3044C/3054C This product is compatible with engines, 306E/307E excavators, and 226B3/236B3/246B3 skid steer loaders, and is paired with 077-8717 retaining rings and 078-0007/078-0108 retainers.

Compatible Models and Application Scenarios

Compatible Equipment: Positioning of the generator stator end cover for CAT 3044C/3054C engines, 306E/307E mini excavators, and 226B3/236B3/246B3 skid steer loaders.

Application Scenarios: Axial positioning of the stator and end cover to prevent misalignment, suppress vibration displacement, ensure stable power generation system, and suit continuous operation.

Installation: Secure to the end cover flange with M7 bolts, torque 12-14 N·m. It is compatible with bearings and drive plates. Axial clearance after installation is ≤0.1 mm.

Installation and Maintenance Points:

Clean the end caps, retainers, 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 step with the end cap positioning surface and the mounting holes. Tighten the bolts crosswise, ensuring no misalignment.

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

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