Title: Identify the causes of control valve leakage (i.e., internal/external).
Course: Diesel Equipment Technology III (20107-III) > Section: Hydraulics: Servicing Control Valves

Identification should include

- performing a visual inspection for any external control valve leaks
- performing an operational test of the control valves to identify internal valve leakage problems
- repairing or replacing, as necessary.

ASE 2: VIII. Hydraulics: E. Control Valves

Process/Skill Questions:

- What is the major cause of internal control valve leakage?
- Why are most control valves removed and replaced by using factory remanufactured valves?