CAT 3D-6215 Final Drive And Wheel Seal Retainer

The CAT 3D-6215 is a Caterpillar original equipment manufacturer (OEM) retainer assembly (compatible with the boom/linkage articulation of Cat 980G/980H loaders and D8R bulldozers, used to secure pins and bearings, withstand vibration and impact loads, and ensure the positioning accuracy and stability of the articulated structure). The following is the original data and does not include information on replacement parts.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model: 3D-6215; Type: Pin Shaft Fixture Assembly (including mounting base, locking bolt, locating key, dust seal); Material: Mounting base (42CrMo alloy steel, heat-treated HB 280-320), Bolt (10.9 grade alloy steel), Locating key (40Cr), Dust seal (Nitrile rubber NBR); Single weight: 3.2 kg; Operating temperature: -40℃ to +120℃; Rated tensile strength: 80 kN; Rated shear strength: 50 kN; Corrosion resistance: IP65; Service life: ≥10000 hours; Applicable torque: 180-200 N・m; Bolt preload: 120-130 kN
Key Dimensions
Mounting base outer diameter: 120 mm (4.724 in); Inner diameter: 50 mm (1.969 in); Height: 65 mm (2.559 in); Number of mounting holes: 4 One piece per side, mounting hole diameter 22 mm (H7 tolerance), locating key dimensions 12 mm × 12 mm × 50 mm (width × height × length), flatness ≤0.06 mm, surface roughness Ra 0.8 μm, fixing seat wall thickness 18 mm, dust ring diameter 50 mm, mating clearance 0.03-0.06 mm, inner diameter tolerance 0/-0.018 mm, outer diameter tolerance 0/-0.025 mm, height tolerance ±0.25 mm.

Compatible Models and Parts: Compatible with the boom and rocker arm hinge points of Cat 980G/980H loaders, and the lifting arm and frame connecting pins of D8R bulldozers. One piece per side is used to lock the axial displacement of the pins, prevent bearing movement, reduce impact wear at the hinge points, and ensure the accuracy of boom/linkage movement.

Performance Parameters: Tensile strength ≥1000 MPa, yield strength ≥800 MPa, bolt thread specification… M20×2.0, locating key hardness HRC 40-45, dust seal oil resistant (compatible with Cat hydraulic oil), aging resistant (≥4000 hours at 100℃), impact load capacity 150 kN (instantaneous), radial runout after assembly ≤0.08 mm, repeatability ±0.02 mm.

Structural and Performance Advantages:

Modular Structure: Integrated mounting base, locking bolts, locating key, and dust seal, completing positioning and protection in one installation, reducing assembly steps and improving fixing reliability.

High-Strength Material: The 42CrMo mounting base is heat-treated, possessing high tensile and shear strength, suitable for vibration and impact under heavy-duty conditions; 10.9 grade bolts ensure stable preload and prevent loosening.

Precise Positioning Design: The locating key and pin/seat hole groove fit together, limiting circumferential rotation; the dust seal prevents mud, water, and dust intrusion, protecting internal pins and bearings and extending component life.

Installation and Maintenance Points (Original Data)

Installation: Clean the pin, bearings, and mounting surfaces (free from oil and impurities). Install the locating key, cold-press the mounting bracket, and evenly tighten the bolts in a crisscross pattern. The preload should be 120-130 kN. After installation, axial movement should be ≤0.05 mm, and radial runout ≤0.08 mm. Welding is prohibited to prevent material degradation.

Maintenance: Check bolt torque and locating key wear every 1200 hours. If torque decreases by more than 10%, retighten. Replace damaged dust seals immediately to prevent impurities from entering. Replace the entire mounting bracket if cracks or deformation are found.

Troubleshooting: Noise at the hinge is often due to worn locating keys or loose bolts, requiring repositioning and tightening. Pin movement is often caused by excessive clearance in the mounting bracket, requiring component replacement and adjustment of the fit clearance.