CAT 116-8242 36.5mm Thick Retainer

CAT 116-8242 is a Caterpillar original shaft retainer used for axial positioning and preventing detachment in engine valve mechanisms, hydraulic pump drive shafts, and other components. The following is structured original data and does not include replacement part information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 116-8242, Type: Shaft Open Elastic Retaining Ring (E-type), Material: 65Mn Spring Steel, Quenched + Tempered, Hardness: HRC 47-54, Surface: Zinc-plated and Passivated, Single Weight: 0.015 kg, Operating Temperature: -40℃ to +120℃, Fits Shaft Diameter: φ30 mm (1.181 in), Used for Axial Positioning of Engine Valve Tappets, Hydraulic Pump Drive Shafts, and Pilot Valve Cores

Key Dimensions
Free Diameter: 30.6 mm (1.205 in), Inner Diameter: 27.8 mm (1.094 in), Thickness: 1.5 mm (0.059 in), Width: 3.5 mm (0.138 in), Opening Width: 6.0 mm (0.236 in), Chamfer: 0.5×45°, Fits Shaft Groove Diameter: 28.5 mm (1.122 in), Groove Width: 3.7 mm (0.146 in), inner diameter tolerance + 0.12/-0.06 mm, thickness tolerance ±0.06 mm
Compatible Models and Parts: Compatible with Cat 3126, 3406E, C7.1, C9.3 engines; valve mechanisms, hydraulic pump drive shafts, and pilot valve groups of 320D2 and 330D2 excavators and 950M loaders, 1-2 pieces per part; axial static load ≤6 kN; suitable for low-speed (≤150 r/min) conditions.
Performance Parameters: Radial spring force ≥100 N, shear strength ≥620 MPa, fatigue life ≥6000 assembly cycles, salt spray test ≥48 hours, axial clearance after installation ≤0.18 mm, suitable journal surface roughness Ra≤1.6 μm
Structural and Performance Advantages:
65Mn spring steel material: quenched + Tempered finish for high elasticity and wear resistance, suitable for vibration and impact conditions, preventing deformation and breakage of the retaining ring.

Open elastic design: After radial contraction and insertion into the shaft groove, it automatically springs back, ensuring a tight fit and precise positioning. No additional fasteners are needed, making disassembly and assembly convenient.

Zinc-plated passivated surface: Enhances corrosion resistance, suitable for humid and dusty environments, and extends service life.

Original factory compatibility guarantee: Dimensions perfectly match the shaft groove, avoiding positioning failure or component wear due to tolerance deviations, ensuring stable equipment operation.

Installation and maintenance points (raw data)

Installation process: Clean the shaft groove and retaining ring. Use retaining ring pliers to pry open and insert the retaining ring into the shaft groove, ensuring it is firmly inserted to the bottom. Check for axial movement, no deformation of the retaining ring, and no scratches on the journal.

Maintenance cycle: Check elasticity and surface condition every 2500 hours. Replace immediately if deformation, cracks, or corrosion are found.

Common troubleshooting: If the elasticity fails and the component moves, replace the retaining ring; if the shaft groove is worn and the clearance is too large, repair the shaft groove or replace the journal; if the retaining ring is broken, check if the installation is in place and avoid uneven loading.