When does CJY400-66-37 shaft mounted reducer need to replace bearings

The bearing replacement of CJY400-66-37 shaft mounted reducer (37kW high-power model, with high load and speed) needs to be comprehensively judged based on the operating status, detection data, and wear degree. When the following situations occur, it must be replaced in a timely manner to avoid the locking damage of core components such as gears and shaft systems caused by bearing failure:
1、 Judging by "abnormal operating status" (intuitive and perceptible fault signal)
Bearing wear or failure will be directly reflected in the operating state. When the following phenomena occur, priority should be given to checking the bearings:
1. Persistent abnormal noise

During operation, there are "high-frequency screaming sounds" (dry friction due to lack of oil), "clattering impact sounds" (rolling element rupture or cage damage), and "rustling friction sounds" (raceway wear or impurities) at the bearing parts (input/output shaft end caps), and the noise intensifies with increasing speed. Even after shutting down the load, the noise still exists (excluding gear meshing problems).

2. Abnormal temperature rise in the bearing area

During normal operation, the bearing temperature should be ≤ ambient temperature+40 ℃ (if the ambient temperature is 30 ℃, the bearing temperature should be ≤ 70 ℃); If it continues to exceed 80 ℃, or if the temperature difference with the same type of bearing on the other side is greater than 15 ℃ (such as the bearings on both ends of the input shaft, with one end at 60 ℃ and the other end at 85 ℃), and after excluding insufficient lubrication and abnormal oil level, the high temperature still exists, it indicates that excessive wear or jamming has occurred inside the bearing.

3. The vibration value exceeds the standard and the spectral characteristics point to bearing faults

Using a vibration analyzer to detect, if the effective value of the radial vibration velocity of the bearing is greater than 6.3mm/s (referring to GB/T 11347 standard, 37kW model warning value), and the characteristic fault frequency of the bearing appears in the spectrum (such as the peak frequency of outer ring fault, inner ring fault, or rolling element passing frequency), it can be determined that the bearing has structural damage (such as track peeling, rolling element cracks).

2、 Judging through "disassembly and observation" (accurately confirming the degree of wear)
When the operating status is abnormal or during regular maintenance, the bearings need to be disassembled and inspected. If the following physical damages occur, they must be replaced:
1. Wear/damage of raceway and rolling elements

Pitting corrosion (dense small pits with an area exceeding 10% of the surface area of the raceway), peeling (block metal detachment, forming obvious grooves), and scratches (axial or radial deep grooves with a depth greater than 0.1mm) appear on the raceway (inner/outer race);

The rolling element (ball/roller) has cracks, deformation, rust, or "pitting" or "indentation" on the surface (diameter>0.5mm), which causes jamming or abnormal noise during rotation.

2. The holder is damaged

The cage may crack or break (causing the rolling elements to shift or collide), or the contact area with the rolling elements may experience severe wear (gap>1mm), resulting in a loss of uniform separation of the rolling elements