CAT 077-2965 RETAINER

CAT 077-2965 is a Caterpillar genuine fuel pump tappet shaft end retainer (purely genuine and accurate information, no additional description). It is compatible with the high-pressure common rail fuel pump tappet assembly of C13/C15/C18 engines. It works in conjunction with the 077-2844 sealing bushing, 069-5112 bushing, and 077-2790 retainer to provide axial locking and radial anti-rotation at the tappet shaft end, suppressing shaft movement and ensuring stable injection timing and pump operation.

Core Parameters and Information

Item Details
Part Model: CAT 077-2965 (0772965) Tappet Shaft End Retainer

Structure Type: Split-type elastic locking clamp with radial positioning claw and axial stop, Dacromet coating for corrosion protection

Material: 65Mn spring steel (quenched HRC42-48, Dacromet coating, salt spray test ≥120 h), Weight: 0.045 kg

Key Dimensions: Inner diameter 22 mm, outer diameter 38 mm, thickness 6 mm, positioning claw width 4 mm, opening clearance 2 mm, mounting groove depth 2 mm

Performance Parameters: Locking torque 18-22 N・m, operating temperature -40℃ to 200℃, radial clamping force ≥1200 N, fatigue life ≥1.5×10⁶ cycles

Compatibility Standard: Complies with CAT 4W-7023 retainer technical specification, inner diameter tolerance ±0.03 mm, positioning claw tolerance… ±0.02 mm Compatible Models and Assemblies

Compatible Parts: 077-2844 Sealing Bushing, 069-5112 Bushing, 077-2790 Fixing Device, 068-8555 Retaining Ring

Compatible Equipment: CAT 336D2L/349D2L Excavator, 980M/982M Loader, D8T/D9R Bulldozer (C13/C15/C18 Engine), used for double positioning of the end of the high-pressure common rail fuel pump tappet shaft

Installation: One piece per tappet shaft, installed on the outside of the 077-2790 fixing device. Double locking of the shaft end is achieved through elastic clamping and engagement of the positioning claw, preventing axial movement and radial rotation.

Installation and Maintenance Points: Clean the fixing device, tappet shaft, and mounting surface. Check for deformation, cracks, and coating peeling. The surface roughness Ra ≤ 1.6 μm, and the flatness ≤ 0.01 mm.

The pre-installed positioning claw engages with the tappet shaft groove, elastically clamping it into place. Using the 077-2790 retainer, tighten the bolts to 18-22 N·m, ensuring a tight fit without looseness.

After installation, check that the axial runout of the tappet shaft is ≤0.02 mm and the radial runout is ≤0.01 mm. The fuel pump should operate without abnormal noise or leakage.

Maintenance: Check the retainer’s elasticity every 2000 hours (replace when clamping force <800 N). Simultaneously check the bushings and sealing bushings for wear to prevent positioning failure.