TM-5-4310-389-14
Section II.
EQUIPMENT DESCRIPTION AND DATA
1-7 EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES. Equipment characteristics, capabilities,
and features of the model K-20 consists of a high-pressure compressor coupled to a two-cylinder diesel connected by a
V-belt drive (figures 1-1 and 1-2). The unit includes an instrument panel, fuel tank, purification system, and a skid-
mounted frame. The K-20 is capable of providing 20 cfm (cubic feet per minute) of free air compressed to 5000 psi
(pounds per square inch). The unit can be operated in temperatures ranging from -25 to +125°F.
a. Compressor. The compressor is a four-cylinder, four-stage, reciprocating, air-cooled unit. The cylinders are
arranged in the form of an X. The compressor will deliver 20 cfm free air compressed to 5000 psi. The fourth
stage cylinder is lubricated by means of a force-fed lubrication system; the other cylinders are mist-lubricated.
The cylinders of the compressor block, the intermediate coolers, and the after cooler are air-cooled. For this
purpose, the compressor is equipped with a cooling fan which draws the cooling air through the cooling fan
cover from the surroundings. The cooling fan is driven by the drive motor V-belt and is mounted on the
flywheel.
b. Diesel Engine. The diesel engine is an air-cooled, four-cycle, two-cylinder, IL (in-line) engine coupled with a dry
plate clutch developing 27 hp (horse power ) at 2200 rpm. The engine can be battery started using a 12-volt
system or may be started by use of a hand crank provided.
c. Instrument Panel. The instrument panel is located on the front side of the unit (figure 1-1) on antivibration
shocks. The rear of the panel is accessible by removing five screws from the back plate.
d. Fuel Tank. The fuel tank is located above the engine, toward the front (figure 1-1). It has a 13gal (gallon)
capacity with no reserve; it is sufficient for eight hours of continuous operation.
e. Purification System. The purification system consists of two purifying cylinders using replaceable cartridges.
f. Frame. The frame is constructed of steel channels unitized by welds. Integrated into the frame design are skids
and slinging/tie-down attachments. The subframe is attached to the main frame by 10 antivibration mounts.
g. Clutch. The dry plate clutch is operated by a hand lever, which enables the engine to be started without the
compressor.
h. Inter and After Coolers. Coolers that enable air to be cooled between the stages of the compressor.
i. Oil/Water Separator Block. The oil/water separator block used on the K180 is almost identical to the commercial
version with the exception of the shatterproof condensate drain coil. The 0 rings are Buna-N rubber instead of
Viton and the sinter filters have been removed (the 0-rings and sinter filter removal are due to the -25°F
operating temperature).
1-3
