MIL-C-0052980C(ME)
4.5.2.14.1
Engine exhaust. Measure the engine exhaust pressure
from a pressure tap approximately 2 inches from the exhaust manifold
flange with the compressor operating at the maximum speed and the
horsepower output specified herein.
Exhaust pressure in excess of
that specified in 3.26.5 shall constitute failure of this test.
When the engine exhaust muffler is furnished by the Government as
part of the military design engine, this test is not required.
Fill the fuel tank with fuel as
4.5.2.14.2 Fuel tank capacity.
applicable.
Start the compressor and operate at rated capacity and
pressure until the engine ceases to operate due to lack of fuel.
No refueling or
The elapsed time of operation shall be recorded.
auxiliary fuel supply shall be allowed.
Elapsed operation time of
less than as specified in 3.26.3.2 shall constitute failure of this
test.
Tow the class 4, size 15 cfm compressor, for
4.5.2.15 Road test.
Twenty-five miles
a distance of 100 miles at maximum safe speeds.
of this travel shall be on cross-country terrain (see 6.9) and 75
Operation on smooth, paved
miles shall be on primary roads.
surfaces shall include not less than 15 abrupt stops from a speed of
25 mph in the forward direction, not less than five abrupt stops
from a speed of 2 mph in the reverse direction, and not less than 10
sharp turns to the left and 10 to the right at not less than 25 mph.
Radii of the sharp turns shall be not greater than 150 feet.
Displacement or damage to welded, bolted, or riveted connections or
failure to operate as specified shall constitute failure of this
test.
4.5.2.16 Center of gra vity tes t.
When mounted on the trailer as
specified in 3.24, determine the horizontal center of gravity of the
Nonconformance to 3.24 shall
class 4, size 15 cfm compressors.
constitute failure of this test.
Tilt the class 4, size 15
4.5.2.17 Tilted operation - class 4.
cfm compressor 15 degrees from the horizontal about the longitudinal
axis and operate in that position for 30 minutes. Repeat this test
in each of the four directions (compressor tilted with respect to
Allow the compressor to
the longitudinal and transverse axes) .
stand for 4 hours in the tilted position most likely to adversely
affect the lubrication or fuel system and then start and operate the
Any malfunction due to
compressor for 30 minutes in that position.
tilted operation such as lack of lubrication, rough or erratic
operation, or permanent deformation of any part or component shall
constitute failure of this test.
4.5.2.18 High temperature.
Conduct the high temperature test on
the class 4, size 15 cfm compressor as specified in 4.5.2.6.
The
test shall be performed with the canvas cover removed on the
non-winterized compressor and with all side panels, louvers, and the
duct in the open position or removed on the winterized compressor.
In addition to the data specified in 4.5.2.5, record the compressor
unit and engine lubricating oil sump temperatures, at 30-minute
intervals.
Failure to start and operate at rated capacity,
30
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