CAT 340-8107 RETAINER

CAT 340-8107 is a Caterpillar genuine axle retainer with a flexible retaining ring. It is used for axial positioning of hinge pins and shaft parts in small and medium-sized excavators, loaders, and other equipment to prevent movement during operation. The following are core original specifications and application information; replacement parts are not included.

Core Technical Parameters

Item Details
Part Model: CAT 340-8107 (Shaft Elastic Retaining Ring Fixer)
Product Type: Open-type elastic retaining ring with mounting groove, suitable for shaft diameter positioning
Material: 65Mn spring steel, integral quenching + tempering treatment
Surface Treatment: Galvanized / passivated, corrosion resistant, suitable for engineering machinery operating conditions
Hardness: HRC 42–48, balanced elasticity and toughness, not easy to break
Single Weight: Approx. 0.08 kg (0.18 lbs)
Suitable Shaft Diameter: Standard suitable shaft diameter 50 mm (tolerance range 49.8–50.2 mm)
Cross-section Dimensions: Thickness 2.5 mm, Width 12 mm
Mounting Groove Requirements: Groove width 2.6–2.8 mm, groove depth ≥ 1.5 mm
Operating Temperature: -40℃ ~ +120℃
Elastic Performance: Radial springback ≥ 3 mm, maintains stable preload after installation
Load Capacity: Rated axial positioning force ≥ 15 kN, suitable for low-impact, non-vibration operating conditions.

Structure and Core Features:
High-elasticity positioning structure: Made of spring steel with professional heat treatment, the open design allows for quick installation into the shaft groove. Elastic tension ensures tight positioning without the need for additional fasteners, making installation convenient.

Corrosion Resistance and Compatibility: Galvanized passivated surface treatment effectively resists corrosion from moisture and dust during construction machinery operation, suitable for shaft positioning needs of various small and medium-sized Caterpillar equipment.

Reliable Anti-migration: Precisely fits the shaft diameter and mounting groove, ensuring a tight fit to the shaft surface after installation. This prevents axial movement of hinge pins, trunnions, and other parts during operation, ensuring connection stability and reducing component wear.

Compatible Models and Application Scenarios:
Excavators: Small tonnage models such as 305.5E2, 306E2, and 307E2, used for hinge pin positioning of the boom, bucket, and connecting rod.

Loaders: Suitable for small and medium-sized models such as 906H, 907H, and 908H, providing axial fixation for booms, rocker arms, connecting rods, and other shaft components.

Core Application: Replaces worn or deformed retaining rings, restoring the positioning function of shaft components and resolving issues such as loose parts and abnormal noises caused by retaining ring failure.