Common Rexnord bearing failures: how to recognize them in time and prevent them

Failures in Rexnord bearings usually announce themselves with noise, vibration or increased temperature. If you hear a humming or metallic knocking, there may be wear on raceways or rolling elements. Excessive vibration, measured with a vibration meter, indicates internal clearance or incipient damage. A bearing running hotter than normal is warning that something is wrong.

Another sign is the presence of metal particles in the lubricant, which reveal flaking or material fatigue. Darkening of the lubricant or a burnt smell are also symptoms of overheating. Visually inspecting the bearing during maintenance shutdowns helps detect corrosion, cracks or deformations in cages and seals.

To confirm the diagnosis, dismount the bearing and inspect the raceways with a magnifying glass. Skid marks, flaking or bluing from temperature are clear evidence. If you have doubts, send us a photo of the bearing and its code, such as 2315U or 9200U, and we will advise you on the probable cause and the appropriate replacement.

Rexnord spherical roller bearings, such as the 2315U or the 5303U, are robust but can fail due to poor lubrication or misalignment. Lack of grease causes metal-to-metal contact, premature flaking and increased temperature. Excessive misalignment generates uneven loads that shorten bearing life.

Incorrect mounting is another frequent cause: if the bearing is mounted by hammering or transmitting force through the rollers, the rollers or cage are damaged. Also, excessive internal clearance, if not adjusted to the recommended value, produces vibration and noise. Using an inadequate lubricant, too viscous or contaminated, accelerates wear.

To prevent these failures, check alignment with a laser or straightedge and respect tightening torques. Lubricate according to the plan, with compatible grease and in the right amount. If the bearing works in a dirty environment, improve the seals or use a bearing with seals. If you notice any anomaly, consult us with the code, for example 9200U, and we will help you choose the replacement.

Rexnord Y-bearings, such as the 3107U or the 3315U, are mounted in housings and are prone to failures due to misalignment or poor fixation. If the fixation of the inner ring to the shaft loosens, the bearing rotates on the shaft and wears both. Lack of lubrication at the housing lubrication point also causes early failures.

Another cause is mounting with a hammer on the outer ring, which damages the seals and raceways. Excessive radial or axial load, beyond what is specified, produces fatigue and flaking. Contamination with dust or water, if the seals are damaged, accelerates corrosion and wear.

To prevent, verify that the shaft is clean and free of burrs before mounting. Tighten the set screws to the specified torque and use a press or adapter sleeve for mounting. Lubricate through the housing grease fitting until clean grease comes out. If you notice play or noise, replace the bearing with a code such as 3207U and consult us for the compatible housing.

Rexnord housings, such as the ZA6107 or the ZB2308, are the base of the bearing and their failures affect the entire assembly. A loose or poorly anchored base generates vibration that damages the bearing. If the housing is misaligned with the shaft, the bearing works under stress and wears prematurely.

Wear of the housing bore, due to rotation of the outer ring, is a typical failure that requires replacing the housing. Corrosion in humid or chemical environments weakens the structure and can cause breakage. An undersized housing, which does not support the load, deforms and transmits abnormal stresses to the bearing.

To prevent, periodically check the anchor bolts and alignment. Use cast iron or steel housings depending on the application and protect surfaces with paint or anti-corrosion treatment. If the housing bore is damaged, replace the complete housing with its code, for example ZA6206, and consult us for the corresponding bearing.

Rexnord Y-housing units with insert bearing, such as the P4B-203-T or the P2B-307-T, simplify mounting but require care. A common failure is wear of the spherical housing seat, which allows the bearing to rotate and generates vibration. Loosening of the set screws to the shaft is also frequent.

Contamination by dust or water, if the bearing seals are damaged, causes premature failures. Excessive load or angular misalignment, beyond the self-aligning capacity, damages the rolling elements. Lack of lubrication at the housing grease fitting accelerates wear.

To prevent, mount the unit with a clean shaft and tighten the screws to the correct torque. Verify that the housing is well anchored and aligned. Lubricate regularly through the grease fitting and replace damaged seals. If you need a replacement, get a quote with the complete code, for example P2B-208-T, and we will quote it promptly.

Rexnord friction bushings, such as the 701-66008-040 or the 701-66024-096, work with sliding and wear naturally. Excessive wear produces radial and axial play, noise and loss of precision. Lack of lubrication, or the use of an inadequate lubricant, accelerates wear and can cause seizure.

Contamination with abrasive particles scratches the sliding surface and increases friction. Incorrect mounting, with misalignment or excessive tightening, causes localized wear. Loads above the admissible ones deform the bushing and reduce its service life.

To prevent, lubricate according to specifications and keep the environment clean. Check play periodically and replace the bushing before it damages the shaft. If you need a replacement, send us the measurements or the code, for example 701-66004-024, and we will quote the appropriate Rexnord bushing.

A preventive maintenance plan is the best defense against failures in Rexnord bearings. Schedule periodic inspections of noise, vibration and temperature, and record trends. Lubricate according to working hours and environmental conditions, without overdoing it to avoid overheating.

Train maintenance personnel in mounting and dismounting techniques with appropriate tools. Use induction heaters or hydraulic presses for large bearings, and pullers for dismounting without damage. Keep workshops clean and store bearings in their original packaging until installation.

When a bearing fails, analyze the root cause to avoid recurrence. Replace with a genuine Rexnord product, which we distribute at MR Accesorios Industriales. If you have doubts about the code or application, write to us via WhatsApp or email with a photo of the part and we will advise you.