Certified Maintenance and Reliability Technician (CMRT) Practice Test

What type of bearing removal can cause the bearing to pop off the shaft with considerable force?

1. Puller method

2. Heat method

3. Hammer method

4. Hydraulic removal method

The correct answer is: Hydraulic removal method

The hydraulic removal method for bearings is an effective technique that utilizes hydraulic pressure to extract the bearing from its housing or the shaft. This method generates uniform force and can often remove bearings that are tightly fitted or have been in place for a long time. When the hydraulic press is engaged, it applies pressure evenly, which helps dislodge the bearing smoothly and often with significant force. Using hydraulic removal is advantageous because it minimizes the risk of damage to both the bearing and the shaft. However, if not controlled properly or if the bearing is seized, the bearing can detach suddenly and with considerable force, leading to a potential hazard if precautions are not taken. In contrast, the alternative methods listed can involve different levels of risk and potential damage. The puller method typically requires manual effort and can lead to uneven force application, while the heat method relies on thermal expansion, which can also be less controlled. Likewise, the hammer method often generates significant shock and risk of damage during the removal process. In situations where a bearing must be removed with considerable force, the hydraulic removal method offers a more controlled and effective solution.