CAT 3K-0556 Torque Converter Bearing Retainer

CAT 3K-0556 is a Caterpillar genuine torque converter bearing retainer (retaining ring type), suitable for positioning torque converter bearings in drive systems such as loaders and bulldozers. The following is purely accurate information (without additional description):

Core Parameters and Information

Item Details
Part Model: CAT 3K-0556 (3K0556) Torque Converter Bearing Retainer

Part Type: Bearing retainer, used for axial positioning of the torque converter input shaft bearing, limiting the axial displacement of the bearing’s inner/outer ring, suitable for heavy-load and impact conditions in drive systems, bearing axial loads, preventing loosening and movement.

Material: Low carbon alloy steel (SAE 1045), integrally quenched and tempered, hardness HRC35-40, surface galvanized and passivated for corrosion resistance, surface roughness Ra≤1.6μm

Key Dimensions: Inner diameter 105.00mm (4.1339in), outer diameter 130.00mm (5.1181in), thickness… 4.50mm (0.1772in), locating groove width 4.00mm, locating diameter 105.00mm, bolt holes 4×φ10.5mm, pitch circle diameter 120.00mm

Structural Features: Annular disc shape with locating flange, 4 evenly distributed bolt holes, suitable for torque converter housing bolt fixing, anti-loosening washers included, rated axial load 18kN, operating temperature -30℃ to 120℃

Compatible Structure: Torque converter input shaft bearing end cover fixing assembly, compatible bearing models 081-5216, etc., installation torque 45-55N・m

Applicable Working Conditions: Torque converter transmission parts, speed ≤2500rpm, axial load ≤15kN, suitable for oil lubrication conditions

Compatible Machines and Assemblies:

Loaders: CAT 938M, 950M, 966M (torque converter bearing fixing assembly)

Bulldozers: CAT D3K, D4K, D5K (Torque Converter Input Shaft Bearing Positioning Assembly)
Compatible Assemblies: 950M Torque Converter Bearing Retainer Assembly, D4K Torque Converter Input Shaft Bearing End Cover Assembly
Installation and Fitting Points:
The mounting surface should be clean and free of burrs. The retainer positioning flange should match the bearing outer ring positioning groove. The bolt holes should be aligned with the housing threaded holes. Do not forcibly strike the positioning flange.

Before installation, check that the retainer flatness is ≤0.05mm, the positioning flange height tolerance is ±0.03mm, and the bolt hole position tolerance is φ0.15mm.

After assembly, there should be no gap between the retainer and the bearing outer ring. Tighten the bolts twice in a crisscross pattern to the specified torque (45-55 N·m). Ensure the anti-loosening washers are firmly against the retainer end face.

Disassembly: Use a socket wrench to unscrew the bolts. Do not pry the edges of the retainer. When replacing, check for retainer deformation. Replace if the deformation is >0.1mm.