CAT 077-9675 RETAINER

CAT 077-9675 is a genuine Caterpillar mounting bracket (purely original and accurate information, no additional description). It is used to secure the generator/starter motor rotor to drive components, compatible with 3044/3054 engines, 306/307 excavators, 226B/246B skid steer loaders, etc., and can be used with 077-8727 bearings, 077-8807 drive plates, and 077-9360 rotor brackets.

Core Parameters and Information

Item Details
Part Model: CAT 077-9675 (0779675) Retainer

Structure Type: Disc-shaped with locating boss, central shaft hole + 3 evenly distributed mounting holes, compatible with rotor shaft end flange positioning, bolt fastening compatible

Material: 42CrMo alloy steel, blackened + anodized surface treatment, conforms to CAT MES J4203 retainer specification

Key Dimensions: Outer diameter 75 mm, inner diameter 22 mm, thickness 9 mm, locating boss height 3 mm, mounting hole diameter 5.5 mm, hole spacing circle diameter 55 mm, compatible with M5.5 bolts

Performance Parameters: Rated axial locking force 4.5 kN, operating temperature -40℃ to +180℃, radial runout ≤0.05 mm, hardness HRC34-39

Compatibility Standard: Complies with SAE J1926 rotor connection standard, central shaft hole compatible with 077-8727 The bearing inner ring mounting holes are compatible with the 077-8807 drive plate bolt hole positions.

Compatibility: Suitable for 3044/3054 engines, 306/307 excavators, and 226B/246B skid steer loaders; compatible with 077-8717 retaining rings and 077-9360 rotor retainers.

Compatible Models and Applications:

Compatible Equipment: CAT 306/307 mini excavators, 226B/236B/246B skid steer loaders, 3044/3054 engines, generator rotors, starter motor rotors, etc.

Applications: Anti-motor shifting of generator rotor shafts, starter motor rotor positioning, hydraulic pump drive component fixing, suppressing component displacement caused by vibration, and ensuring stable power output.

Matching Installation: Secure to the rotor shaft end flange with M5.5 bolts. This is compatible with the 077-8727 bearing, 077-8807 drive plate, and 077-9360 rotor retainer. After installation, the axial clearance should be ≤0.1 mm.

Installation and Maintenance Points: Clean the rotor 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.

The retainer positioning boss should fit against the rotor flange surface, aligning with the mounting holes. Tighten the M5.5 bolts crosswise to a torque of 10-12 N·m.

Post-Installation Inspection: Check for looseness and wobbling. The rotor should rotate without interference and without axial movement. A multimeter should be used to measure the rotor resistance; no abnormalities should be found.

Maintenance: Check the bolt torque and retainer wear every 800 hours. Replace any deformed or damaged threads immediately to prevent component imbalance and subsequent malfunctions.