CAT 389-0698 RETAINER

CAT 389-0698 is a dedicated shaft end retainer for Caterpillar hydraulic systems. It is used to secure bearings and seals of components such as hydraulic pumps and rotary motors to prevent axial movement. It is suitable for medium and high pressure conditions and ensures stable operation of the transmission system. It is commonly found in core hydraulic components of equipment such as excavators and loaders. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 389-0698, Type: Shaft End Fixture (Elastic Retaining Ring + Positioning Flange Combination), Material: 42CrMo Alloy Steel (Quenching Hardness HRC 45-50), Surface: Galvanized and Passivated, Single Weight: Approx. 0.52 kg, Operating Temperature: -20℃ to +120℃, Design Life: ≥10000 hours (normal operating conditions), Suitable for hydraulic systems with pressure ≤35 MPa, Impact Load Resistance: ≥15 kN, Complies with SAE J429 High-Strength Fastener Standard

Key Dimensions
Inner Diameter: 63.5 mm (Tolerance +0.01/-0.005 mm), Outer Diameter: 95.25 mm (Tolerance +0.02/-0.01 mm), Flange Thickness: 12.7 mm (Tolerance 0/-0.1 mm), Positioning Groove Width: 5 mm, Installation Chamfer: r1.2 Bolt hole diameter 10 mm (6 evenly distributed), bolt hole center circle diameter 82 mm, radial interference 0.02-0.04 mm (with shaft mating)

Compatible Models and Parts: Compatible with Cat 320D2, 323D2 excavators, 950H loaders, and other equipment equipped with C4.4/C6.6 engines. Used for hydraulic pump shaft ends, rotary motor housings, etc. Matching components include 103-8329 elastic retaining rings and 5P-0960 extreme pressure lithium-based grease. Can be used in combination with 8E-8162 sealing sleeves, 441-6210 cylinder blocks, etc. Compatible bolt type: 12-1982 (M10×1.5×30 mm)

Performance Parameters: Rated clamping force ≥8 kN, bolt preload torque 25-28 N・m, salt spray corrosion resistance ≥480 hours, tensile strength ≥900 N·m MPa, yield strength ≥750 MPa, flange flatness ≤0.02 mm, positioning accuracy ≤0.03 mm. Structural and Performance Advantages: Alloy steel material undergoes quenching treatment, resulting in high strength and impact resistance. A zinc-plated passivation coating enhances corrosion resistance, making it suitable for harsh working conditions in engineering machinery and preventing fixture corrosion failure.

The modular design integrates the positioning flange and elastic retaining ring. Precise positioning groove limits axial movement, while simplifying installation and adapting to compact equipment layouts.

The multi-bolt evenly distributed design ensures uniform clamping force, suitable for frequent start-stop and vibration conditions in high-pressure hydraulic systems, improving component operational stability and reducing seal wear.

Installation and Maintenance Points: Before installation, clean the fixture, shaft, and mounting base, checking for burrs, rust, or deformation. Use a special tool for press-fitting, ensuring the positioning groove aligns with the groove on the shaft. Tighten the bolts diagonally to achieve the specified preload torque, avoiding uneven local stress.

After installation, check the fit between the flange and the shaft to ensure there are no gaps. Install the elastic retaining ring to prevent the retainer from loosening. Before operation, perform a no-load test run to check for abnormal noises and leaks, ensuring reliable fixing.

Maintenance: Check the bolt tightness every 1000 hours. If loosening, corrosion, or flange deformation is found, replace immediately. If the journal wear exceeds 0.04 mm during replacement, the shaft must also be replaced. Do not mix with retainers of different models.