Lake Monitors Hydraulic System Test Analyzers (Style K & T) User Manual
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Step 5 - Directional Control Valve
To test for leakage in a directional control valve, disconnect the flow
line exiting the control valve and connect the line to the inlet of the
Analyzer. Connect the outlet of the Analyzer to a line returning to the
reservoir. (See Illustration 4) Fully open the Analyzer's load valve by
turning it completely CCW (counter clockwise). Start the system's
pump and allow the oil to reach proper operating temperature.
To test the valve, shift the valve to allow flow to pass through the
Analyzer. Operate the system's pump at its rated RPM - note the flow
rate indicated on the Analyzer. Gradually increase the system pressure
by turning the Analyzer's load valve CW until system pressure is just
below the relief valve setting. Note the indicated flow rate. If the flow
rate has dropped more than it did in Step 2, the valve needs servicing.
Illustration 4
(7)