Technician A says when diagnosing an overheating hydraulic system, be sure that the oil cooler is not plugged and the cooler's fan is working. Technician B says running the hydraulic system at a lower operating temperature will reduce the possibly of oil oxidation. Who is correct?

Tech B is correct and Tech A is incorrect.

Explanation:

Here Tech A is wrong because when diagnosing an overheating hydraulic system, it is not necessary to un plugg the oil cooler rather it should be plugged to for proper diagnosis.

Technician B says running the hydraulic system at a lower operating temperature will reduce the possibly of oil oxidation is correct statement because at temperature oil's physical as well as chemical property tend to change.

Hence, Tech B is correct and Tech A is incorrect.