Table 9-1.--A/M27T-5 Main Control Panel Controls and Indicators--Continued.
H.P. GAUGE TEST port
Allows application of hydraulic fluid from external source for use in
testing and calibrating HIGH PRESSURE GAUGE. Used only
when H.P. GAUGE SHUTOFF VALVE (on secondary control
panel) is closed.
High pressure gauge calibrating
Used to calibrate HIGH PRESSURE GAUGE when H.P.
SHUTOFF valve (on secondary control panel) is closed.
HIGH PRESSURE GAUGE
Indicates hydraulic pressure (0 to 6000 psi scale) at PRESSURE
OUTLET ports. closing H.P. GAUGE SHUTOFF valve (on
secondary control panel) isolates HIGH PRESSURE GAUGE from
hydraulic system, enabling testing and calibration of gauge.
Indicates hydraulic fluid temperature (20° to 220°F scale) at
hydraulic pump high pressure inlet port.
Ignition switch S1
When set to IGNITION ON turns on panel lights DS1, DS2, and
DS3 and IGNITION ON indicator DS9. Switches battery current to
power supply electrical system, enabling diesel engine start-up.
IGNITION ON indicator (DS9)
When illuminated, indicates ignition switch S1 is set to IGNITION
Indicates diesel engine coolant temperature (100° to 250°F scale).
HEAD TEMPERATURE gauge
Table 9-2.--Portable Hydraulic Test Stands
MFR & P/N (CAGE)
1. A/M27T-5/-7 test stands are preferred equipment and shall be used whenever available.
2. All electric motor-driven units operate from 220/440-V, 3-phase power source.
NOTE: When actually cleaning and deaerating
gauges; they should be at or near zero. Clean and
the test stand, you should follow the procedures
connect the service ends of the external pressure and
contained in the applicable manuals.
return line hoses to the hose storage (recirculation)
Set up the test stand to provide fluid flow from the
manifold on the equipment. If the manifold is
internal reservoir through the external service hoses
equipped with a shutoff valve, place the valve in open
and interconnecting manifold. Place the pump
pressure compensator at its lowest setting, and make
Start test stand engine (or motor) according to the
sure that the manifold and service outlet valves (if
applicable operating instructions. Allow the engine to
present) are in the open position. The high-pressure
warm up to its normal operating temperature.
gauge should indicate a value less than 600 psi. Allow
Recirculation clean and deaerate the hydraulic fluid in
the test stand to recirculation clean for 3 to 5 minutes.
the test stand. Perform both operations at the same
Monitor the fluid temperature throughout the cleaning
cycle. Make sure that maximum operating limits are