Lesson 2/Learning Event 2
Learning Event 2:
DESCRIBE THE INSPECTION AND TROUBLESHOOTING PROCEDURES FOR POWER STEERING
SYSTEMS
TROUBLESHOOTING
Hydraulic pumps, cylinders, motors, and valves are precision units. Smooth
operation depends on frequent inspections and proper servicing of hydraulic
systems. They must be kept clean, and the oil and filters must be changed
as recommended in the technical manuals.
Improper operation can generally be traced to one of the following causes:
Liquid of the wrong kind or of the wrong viscosity.
Not enough liquid in the system.
Air in the hydraulic units or lines.
Damaged or worn parts.
Oil leaks, internal or external.
Dirt, water, sludge, rust, metal cuttings, or other foreign matter
in the system.
Units and control linkage improperly adjusted.
Operator error.
Troubleshooters should use procedures that will lead them directly to the
cause of troubles. Eliminate as much guesswork as possible. One set of
procedures is called STOP, described as follows:
Study the hydraulic circuit diagrams. Know what each part in the
S
system is supposed to do. This is probably the most vital part
of troubleshooting.
Test, using all equipment and means available. You must know
T
exactly what conditions exist in the system and how it reacts
before you can make accurate decisions.
Organize the knowledge gained from the circuitdiagram study and
O
hydraulic system tests; then determine the cause of the trouble.
Perform repairs, taking time to do the job well.
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