CAT 171-5956 90mm Inner Diameter Journal Bearing

CAT 171-5956 is a Caterpillar genuine single-row deep groove ball bearing, suitable for hydraulic pumps, accessory drives, or steering systems in skid steer loaders, mini excavators, and other equipment. It is used for radial positioning and rotary support under medium to low speeds and medium loads. The following are core original specifications and application information, excluding replacement parts (Cat®)…

Core Technical Parameters

Item Details
Part Model CAT 171-5956 (BEARING – SINGLE ROW BALL)
Product Type Single row deep groove ball bearing, double-sided metal dust cover (Z/Z), non-contact seal, suitable for medium-low speed, medium load radial conditions

Material Inner/Outer Ring: High carbon chromium bearing steel (52100); Balls: Chromium steel; Cage: Reinforced nylon (PA66-GF25)

Surface Treatment Inner/Outer Ring Quenched and Tempered (HRC 60–64), Balls Precision Grinded, Surface Roughness Ra ≤ 0.08 μm, Dust Cover Stamped

Hardness Inner/Outer Ring HRC 60–64, Balls HRC 62–66, Coefficient of Friction 0.001–0.002 (Grease Lubricated State)

Single Weight Approx. 0.15 kg (0.33 lbs)

Key Dimensions Inner Diameter 30 mm, Outer Diameter 62 mm 16 mm wide, suitable for small hydraulic pump shaft ends or accessory drive shafts.

Matching Requirements: Suitable for shaft diameter tolerance f7, mounting hole tolerance H7, recommended radial clearance 0.015–0.03 mm.

Operating Temperature: -40℃ ~ +120℃

Load Capacity: Rated dynamic load 19.5 kN, rated static load 10.8 kN, limiting speed 7500 rpm (grease lubrication).

Lubrication Method: Pre-filled lithium-based grease (CAT specific), filling amount 1/3–1/2 of the bearing cavity, double-sided dust cover seal, no additional lubrication required under normal operating conditions.

Sealing Characteristics: Double-sided metal dust cover, protection rating IP54, effectively blocks dust and moisture intrusion, suitable for outdoor working conditions of construction machinery.

Structure and Core Characteristics: Double-sided dust cover design: The metal dust cover has a clearance fit with the inner and outer rings, providing reliable dust and moisture protection without affecting the rotational speed, extending the bearing’s service life, suitable for hydraulic pumps, steering systems, and other parts with high cleanliness requirements.

Nylon cage advantages: Reinforced nylon cages are lightweight, wear-resistant, and corrosion-resistant, effectively reducing operating noise (≤ 55 dB), meeting the low-noise requirements of equipment such as loaders, while improving stability during high-speed rotation.

Pre-lubricated sealing structure: Factory-filled with special lithium-based grease, double-sided dust caps prevent grease leakage and external contaminant intrusion, reducing maintenance frequency and adapting to harsh working conditions of construction machinery.

High compatibility: Compatible with hydraulic pumps, accessory drive shafts, or steering systems of Caterpillar 262D and 272D skid steer loaders, 301.7D and 302.7D mini excavators, etc., offering high versatility.

Compatible models and application scenarios: Skid steer loaders: 262D, 272D, etc., used for hydraulic pump drive shaft support and steering system gear shaft support, providing radial positioning and rotational support, reducing shaft wear and vibration.

Mini excavators: 301.7D, 302.7D, etc., compatible with accessory drive shafts and small hydraulic pump shafts, ensuring smooth transmission and resolving issues such as abnormal noise and leakage caused by bearing wear.

Core applications: Used for radial positioning and rotary support in small hydraulic pumps, accessory drives, or steering systems, suitable for low-to-medium speed and medium-load conditions, improving component operational stability and reliability.