CAT 415-1894 General Duty Elevator Hub

CAT 415-1894 YM is a Caterpillar genuine retarder adjustment shim used for clearance control and sealing compensation in heavy-duty transmission retarders. The following is raw data only and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 415-1894 YM, Type: Retarder Adjusting Shim, Material: Low Carbon Alloy Steel (Galvanized and Passivated Surface), Weight: 0.08 kg, Applicable Working Conditions: Retarder piston clearance adjustment, sealing surface compensation, Operating Temperature: -40℃ to +150℃, Suitable for retarder piston stroke adjustment, sealing ring end face clearance compensation, Oil-resistant, Aging-resistant, Impact-resistant

Key Dimensions (Metric/Imperial)
Inner Diameter: 142.0 mm (5.591 in, Tolerance ±0.1 mm), Outer Diameter: 186.0 mm (7.323 in, Tolerance ±0.1 mm), Thickness: 2.0 mm (0.079 in, Tolerance ±0.02 mm), Surface Roughness: Ra≤0.8 μm, Flatness: ≤0.03 mm/100 mm, Galvanized Layer Thickness: 8-12 μm

Performance Parameters
Material Hardness: HB 180-220 mm, tensile strength ≥420 MPa, yield strength ≥240 MPa, oil resistance meets Cat DEO-ULS standards, no rust after ≥96 hours of salt spray testing, can withstand a maximum clamping force of 50 kN, suitable for retarder working pressure 0-2.5 MPa.

Structure and Compatibility Characteristics

Gap Adjustment Function: Precisely controls the working gap between the retarder piston and stator/rotor (standard gap 0.5-1.2 mm). The gap is adjusted by increasing or decreasing the number of shims, ensuring stable retarder braking torque and preventing braking failure due to excessive gap or component wear due to insufficient gap.

Sealing Compensation Function: The flat surface of the shims compensates for minor deformations and roughness differences in the sealing surface, enhancing the sealing effect, preventing hydraulic oil leakage from the retarder, reducing vibration and noise, and improving the retarder’s operational stability.

Operating Condition Adaptability: Made of low-carbon alloy steel, combining toughness and rigidity, with galvanized passivation treatment for corrosion resistance, it is suitable for retarder applications involving high-frequency start-stop and large temperature fluctuations. It is resistant to deformation and corrosion over long-term use, ensuring long-term stable clearance adjustment accuracy.

Installation and Maintenance Points (Original Data)

Installation: Clean the retarder sealing surface and gasket surface (free from oil, rust, and impurities). Gaskets must be placed flat, avoiding overlap or skewing. After installation, check the piston stroke and clearance. Adjust to the standard range by adding or removing gaskets. Tighten bolts in a symmetrical, cross-tightening sequence, using the original manufacturer’s specifications (typically 80-100 N·m).

Maintenance: Check the gasket condition every 2000 hours. Replace promptly if deformation, rust, or damage is observed. When replacing retarder seals, it is recommended to replace the gaskets simultaneously to ensure clearance and sealing performance. For long-term storage, ensure a sealed, moisture-proof environment to prevent rusting of the galvanized layer.