Table 4-6.AHT-63 Control Panel Controls and InstrumentsContinued
Needle valve with 4-prong
When opened, causes high
pressure relief valve to dump
flow to return line at no
HIGH PRESSURE GAUGE
Bourdon tube type; 0 to 6000
Indicates fluid pressure at
psi with zero adjusting screw
pressure outlet port.
Direct reading counter type 0
Indicates total elapsed
to 9,999.9 hours.
operating hours of Test Stand.
POWER ON Indicator Light
Panel mounted with green
Turns on when control
lens. Bulb, 30V, candelabra
circuit is energized and
master switch is ON.
Toggle switch, DPST.
Energizes electrical control
Black pushbutton switch.
Starts electric drive motor.
connection, and operation from the applicable
warm up to its normal operating temperature.
maintenance manuals. You should know some of the
minimum general requirements about the use of all
portable test stands. Locate the test stand so there is
adequate room and ventilation, and where engine heat
can be dissipated. Set parking brakes securely and
open all necessary access doors. Check the hydraulic
fluid level of the test stand reservoir. It should be
three-fourths full, as indicated on the gauge. Add
fluid if required. Check fuel gauge, radiator level,
and engine oil level in engine-driven stands. Make
sure that they are adequate for the anticipated
operating period. Check the power connections in
electric-powered stands for correct phasing and
frequency. Check the pointers of all other gauges;
they should beat or near zero. Clean and connect the
service ends of the external pressure and return line
hoses to the hose storage (recirculation) manifold on
the equipment. If the manifold is equipped with a
shutoff valve, place the valve in open position.
Start test stand engine (or motor) according to the
applicable operating instructions. Allow the engine to
Recirculation clean and deaerate the hydraulic fluid in
the test stand. Perform both operations at the same
When actually cleaning and
deaerating the test stand, you should follow
the procedures contained in the applicable
Set up the test stand to provide fluid flow from the
internal reservoir through the external service hoses
and interconnecting manifold. Place the pump
pressure compensator at its lowest setting, and make
sure that the manifold and service outlet valves (if
present) are in the open position. The high-pressure
gauge should indicate a value less than 600 psi.
Allow the test stand to recirculation clean for 3 to 5
minutes. Monitor the fluid temperature throughout
the cleaning cycle.
Make sure that maximum
operating limits are not exceeded. Monitor all filter
differential pressure indicators, particularly those
associated with the 3-micron filter assemblies. If you