CAT 156-6997 BEARING

CAT 156-6997 (1566997) is a Caterpillar original single-row deep groove ball bearing used for the rotational support of components such as engines, transmissions, and hydraulic pumps. The following is purely precise information (without additional description): Cat®…

Core Parameters and Information

Item Details
Part Model: CAT 156-6997 Deep Groove Ball Bearing

Part Type: Single-row open deep groove ball bearing, capable of handling radial loads and small amounts of bidirectional axial loads, suitable for medium to high-speed rotation

Material: High-carbon chromium bearing steel (GCr15), integrally quenched and tempered, inner ring/outer ring/ball hardness HRC 60-64, cage is reinforced nylon 66

Key Dimensions: Inner diameter 38.10 mm (1.500 in), outer diameter 72.00 mm (2.8346 in), width 14.29 mm (0.5626 in), chamfer radius 1.0 mm

Structural Features Unsealed, no dust cover, with stamped cage, standard radial clearance (C3), suitable for grease/oil lubrication, easy to maintain and replace.

Compatible Structures: Engine water pump shaft bearing, gearbox input shaft front bearing, hydraulic pump drive shaft support bearing, drive axle half shaft bearing.

Applicable Operating Conditions: Suitable for -40℃ to 120℃, grease lubrication limiting speed 6000 rpm, oil lubrication limiting speed 8000 rpm, radial load ≤18 kN.

Compatible Models and Assemblies:

Engine: CAT C7.1, C9.3 construction machinery engine (water pump shaft bearing)

Loader: CAT 938M, 950M (gearbox input shaft bearing, hydraulic pump bearing)

Excavator: CAT 320GC, 323GC (swing motor reducer bearing, stick cylinder hydraulic pump bearing)

Grader: CAT 140M, 160M (blade drive motor bearing, gearbox output shaft bearing)

Compatible Assembly: CAT 3512 Engine water pump assembly, 950M gearbox input shaft assembly, 320GC rotary motor reducer assembly
Installation and Fitting Points
* Shaft diameter: 38.10 +0.012/-0.000 mm, interference fit with the bearing inner diameter (interference 0.005-0.012 mm) to prevent relative rotation.
* Mounting hole diameter: 72.00 +0.025/-0.000 mm, clearance fit with the bearing outer diameter (clearance 0.01-0.025 mm) for easy installation and heat dissipation.
* Install using cold pressing method. Apply pressure to the inner/outer ring end faces using a special bearing press. Do not directly hammer to avoid damage to the steel balls/raceways.
* Before installation, clean the shaft, mounting hole, and bearing surfaces, ensuring they are free of burrs, oil, and rust. Check the bearing for abnormal noise and jamming.

After installation, add general-purpose lithium-based grease (filling the bearing with 1/3 to 1/2 of its internal space), check the lubrication status regularly, and replenish lubrication every 1000 working hours.