CAT 188-4094 45mm Roller Bearing

CAT 188-4094 is a Caterpillar genuine single-row radial short cylindrical roller bearing, suitable for high-speed, medium-load rotating components such as hydraulic pumps and gearboxes. The following are precise original factory specifications and application information, excluding replacement parts.

Core Technical Parameters

Item Details
Part Model CAT 188-4094 (Single Row Cylindrical Roller Bearing, Cageless / Full Complement)

Product Type: Engineering machinery transmission bearing, suitable for radial positioning and high-speed rotational support of journals, bearing pure radial loads, suitable for gearbox and hydraulic pump spindle applications

Material: Inner ring / Outer ring: Bearing steel (SUJ2/52100), carburized and quenched hardness HRC 60–64; Rollers: High carbon chromium bearing steel, ultra-fine ground surface Ra ≤ 0.08 μm

Key Dimensions: Inner diameter 40 mm (1.575 in), outer diameter 62 mm (2.441 in), width 12 mm (0.472 in), radial clearance C3, fit tolerances: inner ring k5, outer ring P6

Structural Features: Full complement cylindrical rollers (cageless), load capacity 40% higher than caged bearings of the same specification, suitable for low-speed heavy-load or intermittent high-speed applications

Rated Parameters Basic rated dynamic load: 32 kN, basic rated static load: 38 kN, limiting speed (oil lubrication): 6500 rpm, operating temperature: -30℃ ~ +180℃
Single weight: Approx. 0.13 kg (0.29 lbs)
Lubrication compatibility: Suitable for mineral oil/synthetic gear oil, recommended viscosity ISO VG 46–68, lubrication method: oil bath or splash lubrication
Structure and core characteristics:
High load capacity: Full complement roller design, large contact area, suitable for radial load concentration areas such as gearbox shafts and hydraulic pump spindles, excellent impact and fatigue resistance.

Precise radial positioning: Cylindrical rollers and raceways make line contact, radial runout ≤ 0.01 mm, ensuring shaft rotation accuracy and reducing vibration and noise (≤ 65 dB).

Suitable for high-speed operation: Ultra-fine ground rollers and raceways, low coefficient of friction (μ≤0.002), limiting speed up to 6500 rpm under oil lubrication, suitable for the high-speed operation requirements of hydraulic pumps.

Stable Installation and Adaptability: The inner ring (K5) has an interference fit, and the outer ring (P6) has a clearance fit. After installation, the shaft system remains stable, adapting to temperature variations and vibration conditions.

Compatible Machines and Application Scenarios

Compatible Equipment: Hydraulic pumps (such as the 146-0817 pump unit), gearboxes (such as the 700-0500 gearbox), and transfer cases of CAT 307/308 excavators, 906/907 loaders, and 416/420 mini excavators.

Core Application: Installed on the hydraulic pump spindle, gearbox intermediate shaft, or transfer case output shaft, providing radial support and positioning, adapting to high-speed rotation and medium radial load conditions, ensuring stable operation of the transmission and hydraulic systems.