CAT 094-9131 MAIN BRG SET

CAT 094-9131 (0949131) is a dedicated main bearing assembly for Caterpillar hydraulic pumps/slewing motors. It is compatible with medium to large-sized equipment such as 349/352/374 excavators and 982/988 loaders. It supports the main shaft and bears radial loads, ensuring stable transmission and reliable sealing. It is a core load-bearing component of the power system (Cat® Parts).

Core Parameters

Item Details
Part Model: CAT 094-9131 (0949131) Main Bearing Assembly

Type: Tapered roller bearing assembly, including inner ring, outer ring, rolling elements, and cage, withstands radial + bidirectional axial loads, suitable for heavy-duty applications

Material: Inner ring/outer ring: Chromium bearing steel (GCr15), quenched + tempered, hardness HRC60-64; Rolling elements: GCr15, precision grade P5; Cage: Phenolic resin/copper alloy, excellent lubrication and heat dissipation

Key Dimensions: Inner diameter approx. 180mm, outer diameter approx. 240mm, width approx. 45mm, roller diameter approx. 22mm, quantity approx. 20 pieces, single set weight approx. 8.2kg

Compatible Machines: CAT 349, 352, 374 excavators, 982, 988 loaders, suitable for hydraulic pumps and swing motors of C13/C15 engines

Matching Relationships Matching the retainer (094-8831/094-8835), spring base (094-8233), and lower retaining ring (094-7732), it is installed inside the bearing cavity to support the main shaft and suppress vibration.

Suitable for: Hydraulic pump main shaft support, rotary motor output shaft bearing cavity. It is installed in the bearing housing with an interference fit, supporting the main shaft and bearing radial loads. In conjunction with the axial retainer, it prevents axial movement, ensures preload and sealing effect, and avoids oil leakage and component wear (Cat® Parts).

Application scenarios: Heavy-duty, high-frequency vibration conditions such as mining and large-scale earthmoving. Suitable for medium to large-scale equipment power systems, improving bearing life and operational stability, and reducing the risk of failure.

Core functions: Provides high-strength radial support, offsets impact loads, suppresses vibration, protects seals and spring bases, extends component life, and reduces maintenance frequency.

Installation and Maintenance Points

Installation: Clean the bearing housing and spindle surface. Heat the bearing (80-100℃) before heat-fitting. Control the interference fit to 0.02-0.05mm. After installation, check the radial clearance (0.03-0.06mm). Tighten the axial retainer according to specifications (torque approximately 500-550N・m) to ensure no jamming or abnormal noise.

Maintenance: Check the bearing temperature (≤80℃) and vibration value every 200 hours. Regularly replace the hydraulic oil and filter element. If abnormal noise, abnormal temperature rise, or seal leakage is found, immediately stop the machine for repair.

Replacement: Prioritize original parts. Verify the model and dimensions. After installation, test the power system to ensure it operates normally, without abnormal noise, leakage, or abnormal temperature rise.