CAT 094-7904 SEAT SPRING

CAT 094-7904 (0947904) is a dedicated spring base for Caterpillar hydraulic pump/motor bearing cavities. It supports the bearing preload spring, providing stable axial preload force and is compatible with the power transmission systems of medium to large excavators and loaders, ensuring reliable operation of bearings and seals (Cat® Parts).

Core Parameters

Item Details
Part Model: CAT 094-7904 (0947904) Spring Base

Type: Bearing preload spring support, axial preload transmission and positioning, anti-loosening and vibration reduction

Material: 40Cr alloy steel, tempered + surface oxidation blackening treatment, hardness HRC38-42, tensile strength ≥980MPa, fatigue resistance, wear resistance

Key Dimensions: Inner diameter approx. 152mm, outer diameter approx. 172mm, height approx. 28mm, spring mounting groove depth approx. 12mm, single weight approx. 2.8kg

Compatible Models: CAT 330, 336 excavators, 972, 980 loaders, hydraulic pumps and travel motors compatible with C9.3/C13 engines

Matching Relationship: Compatible with preload springs, bearings, and lower retaining rings (e.g.) (094-7732) Matching material, installed above the bearing, transmits preload and suppresses vibration.

Applications:
Suitable for: Top of hydraulic pump bearing housing, inside of travel motor end cover; supports the preload spring, evenly transmits spring force to the bearing outer ring, provides continuous axial preload, and prevents increased bearing clearance and seal failure caused by vibration.

Application Scenarios: Heavy-duty and severe vibration conditions such as mining and large-scale earthmoving; suitable for medium and large equipment power systems, extending bearing life and reducing leakage risk.

Core Functions: Supports the preload spring and transmits axial preload, maintains optimal bearing clearance, counteracts vibration impact, ensures coaxiality, protects seals, and reduces failure frequency.

Installation and Maintenance Points:
Installation: Clean the mounting surface and spring groove; ensure the base, spring, and bearing outer ring are in close contact, without deformation or burrs; after installation, check for uniform preload and no axial movement.

Maintenance: Check the base condition every 300 hours for cracks, deformation, and wear; replace immediately if abnormal. Regularly check the temperature and unusual noises of related components; disassemble and repair if abnormalities are found.

Replacement: Prioritize original parts; verify model and dimensions. After installation, test the power system to ensure it operates normally, without unusual noises, leaks, or looseness.