CAT 595-2226 Drive Shaft Mounted Bearing

CAT 595-2226 is Caterpillar’s driveshaft-mounted double-row tapered roller bearing assembly, featuring a built-in bearing housing and seal. It is suitable for intermediate supports on long driveshafts in engineering machinery, used to withstand radial and bidirectional axial loads, compensate for installation misalignment, and suppress vibration. The following is structural technical and application information from Cat® Parts.

Core Technical Parameters

Item Details
Basic Attributes Model 595-2226, type is mounted double row tapered roller bearing (dedicated for intermediate support of drive shaft), material is high carbon chromium bearing steel (chromium content 1.4-1.65%), bearing housing is ductile iron, cage is stamped steel plate, single weight is about 12.5 kg, operating temperature -40℃ to +120℃, lubrication method is lifetime pre-filled grease (NLGI 2 lithium-based grease, containing extreme pressure additives), fit tolerance: inner diameter js6, bearing housing mounting hole H7, surface roughness Ra≤0.4 μm

Key Dimensions Inner diameter 75 mm (2.95 in), outer diameter 180 mm (7.09 in), total width 110 mm (4.33 in), bearing housing mounting hole diameter 180 mm, bolt hole distribution circle diameter 220 mm, bolt specification M16×1.5 (4 pieces), radial clearance 0.10-0.15 mm, allowable self-aligning angle ≤0.5°, compatible shaft diameter 75 mm, rated load ≤350 kN

Compatible Models and Locations: Compatible with Cat 966K/972K loaders, 336GC excavators, and 444F2 backhoe loaders. Mounted on the intermediate support of the drive shaft, it supports long drive shafts to prevent deflection. One piece per drive shaft, used for the middle section of the drive shaft connecting the gearbox and drive axle, bearing combined loads.

Performance Parameters: Radial rated dynamic load ≥420 kN, radial rated static load ≥680 kN, axial rated dynamic load ≥180 kN, axial rated static load ≥320 kN, maximum allowable linear velocity ≤2.5 m/s, coefficient of friction ≤0.004, fatigue life ≥15000 hours, limiting speed 2200 rpm RPM

Structural and Performance Advantages

Integrated Design: The bearing, bearing housing, double-lip seal, and dust cover are integrated into one unit. Pre-lubricated for maintenance-free operation, no additional clearance adjustment is required during installation, reducing assembly difficulty and adapting to harsh outdoor conditions.

Double-row tapered roller structure: Two rows of rollers are symmetrically distributed, simultaneously bearing radial and bidirectional axial loads. The roller large-end contact angle is 25°, providing strong resistance to impact and vibration, suitable for frequent start-stop and load fluctuation conditions of the drive shaft.

Ductile iron bearing housing: Balancing strength and toughness, high mounting surface precision, and accurate bolt hole positioning, allowing direct mounting to the frame or subframe, ensuring bearing and drive shaft coaxiality ≤0.05 mm.

Upgraded sealing protection: Double-lip nitrile rubber seal + dust lip, IP65 protection rating, effectively preventing mud, water, and dust intrusion. Pre-lubricated for stable operation from -40℃ to +120℃, preventing lubrication failure.

Installation and Maintenance Points

Installation Procedure: Clean the drive shaft journal and bearing housing mounting surfaces, ensuring they are free of burrs and rust; heat-fit (journal heated to 80-100℃) or cold-press (interference allowance 0.03-0.05 mm), pressing in with a special tool, avoiding striking the bearing housing; tighten the M16 bolts to 80-90 N·m with a torque wrench, ensuring symmetrical tightening; after installation, check for radial runout (≤0.03 mm) and axial movement (≤0.05 mm).

Maintenance Cycle: Check bearing temperature (≤85℃) and vibration every 1500 hours; check seals and bolt torque every 3000 hours; disassemble and inspect every 5000 hours, replacing bearings with cracked housings, damaged seals, or worn rollers; under severe operating conditions, shorten the interval to 750-1000 hours.

Common faults and solutions: Excessive temperature rise is mostly due to loose bolts, which need to be tightened again; abnormal noise is mostly due to worn bearings or damaged rollers, which requires replacement of the assembly; oil leakage is mostly due to aging seals, which requires replacement of the seals or the assembly; excessive vibration requires checking the balance and coaxiality of the drive shaft.