CAT 7T-4214 Recoil Spring Retainer

The CAT 7T-4214 is a commonly used shaft end retainer (circlip retainer) for Caterpillar construction machinery. It is compatible with the slewing bearing, final drive, or track roller shaft ends of Cat 320, 330, and other series excavators. It is used to axially position bearings, gears, and other components to prevent them from shifting during operation and to ensure the stable operation of the transmission system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 7T-4214, Type: Shaft Elastic Retaining Ring (External Snap Ring), Material: 65Mn Spring Steel, Surface Oxidation Blackening Treatment, Hardness: HRC42-48, Single Weight: Approx. 0.08 kg, Applicable Temperature: -40℃ to +150℃, Elastic Limit ≥1200 MPa, Fatigue Life ≥5000 Cycles of Alternating Load

Key Dimensions
Inner Diameter: 100.0 mm (Tolerance -0.10/-0.20 mm), Outer Diameter: 118.0 mm (Tolerance 0/+0.15 mm), Thickness: 2.0 mm (Tolerance ±0.05 mm), Opening Width: 8.0 mm, Snap Ring Groove Diameter: 100.0 mm (Tolerance +0.02/+0.05 mm), Groove Width: 2.2 mm (Tolerance +0.10/+0.20 mm), Compatible Shaft Diameter 100.0 mm (Tolerance 0/-0.03 mm)
Compatible Models and Applications: Compatible with Cat 320D/D2, 323D/D2, 330D/D2 and other tracked excavators. Used on the slewing bearing end, final drive gear shaft end, and track roller shaft end. Matching parts include 7T-4215 snap ring clamps and 168-8393 seals for fixing bearings, gears, and other components, preventing axial movement, and protecting transmission system components.

Performance Parameters: Radial elastic deformation ≤0.5 mm, axial positioning clearance after assembly ≤0.10 mm, corrosion resistance meets ISO 9227 standard (no rust after 48 hours), shear strength ≥600 MPa, suitable for oil and grease lubrication.

Structural and Performance Advantages: High-elasticity material: 65Mn spring steel, professionally heat-treated, possesses excellent elasticity and toughness, can maintain preload for a long time, suitable for high-frequency vibration and impact conditions at the shaft end, avoiding fixation failure. Precise Dimension Control: Strict tolerances ensure a perfect fit with the retaining ring slot, preventing loosening and abnormal noise after installation, guaranteeing axial positioning accuracy of components, and reducing wear on the transmission system.

Oxidation Blackening Surface Treatment: Enhances corrosion and wear resistance, suitable for harsh construction environments, extends the lifespan of the retainer, and reduces maintenance frequency.

Standardized Design: Universal dimensions and installation interfaces adapt to various machine models, facilitating easy installation without additional processing, allowing for quick replacement, and improving maintenance efficiency.

Installation and Maintenance Points: Before installation, clean the retaining ring slot and shaft end, checking for burrs and cracks; use 7T-4215 dedicated retaining ring pliers to open the retaining ring and smoothly insert it into the retaining ring slot, ensuring the retaining ring is fully positioned, without twisting or skewing, and that the retaining ring fits tightly against the bottom of the slot.

After installation, check that the component has no axial movement, rotates freely without jamming, and undergoes a test run to confirm no abnormalities; regularly check the elasticity and surface condition of the retaining ring, and replace it immediately if deformation, breakage, or severe corrosion is found.

Maintenance: Check the condition of the retaining ring every 1000 hours. If the elasticity decreases and the positioning gap is greater than 0.20 mm, replace it in time. When replacing, original parts should be selected first to ensure compatibility with the retaining ring groove and shaft diameter, and avoid fixing failure due to size mismatch.