MAC TOOLS MW250 Instruções de Operação descarregar pdf (Página 25)

TM 5-4310-452-14

1-16. LUBRICATION SYSTEM (Con't).

Key Component Description

1 Inlet Air Cleaner Prevents foreign particles such as dirt and water from being inducted into the

compressor air inlet.

2 Air Actuating Acts in unison with the pressure regulator to adjust the engine governor to load

Governor Control demand.

3 Compressor A positive displacement, helical-type compressor consisting of two, one-piece

meshing helical rotors within a compression chamber. Operating at high speed

within a tight casing, the rotors draw air in from the top inlet, compress it axially, and

discharge it from the bottom at the opposite end. Cooled oil is injected into the

compression chamber under controlled pressure to cool the air, seal the rotor

clearances, and lubricate the rotor surfaces. Pressure lubrication is also supplied to

the gears and bearings. The oil which mixes with the air during compression passes

into the oil separator.

4 Unloader Valve Controls the compressor capacity by throttling the volume of air admitted to the

Assembly compressor. Unloader valve assembly is air-operated.

5 Oil Cooler Cools compressor lubricating and cooling oil to prevent over-heating of the

compressor.

6 Oil Temperature Regulates cooling and lubricating oil flow to partially bypass the oil cooler when oil

Bypass Valve is cold. Valve modulates oil flow between bypass and oil cooler to maintain an

optimum oil temperature.

7 Oil Filter Assembly Removes foreign particles from the compressor lubricating and cooling oils.

8 Manual Blowdown Valve The hand-operated valve can relieve the oil separator system of all pressure. Use

only if the safety relief valve does not work,

9 Safety Relief Valve Releases compressed air from the oil separator system to the atmosphere when air

pressure exceeds 150 psi (1034 kPa).

10 Oil Separator Receives compressed air and oil mist from the compressor. Most of the oil

immediately falls to the bottom of the oil separator tank. Any oil remaining in the air

is removed by the oil separator. In addition to lubricating and cooling oils, the oil

separator stores compressed air. The pressure of the compressed air in the oil

separator tank is indicated by the discharge pressure gage.

11 Automatic Blowdown Vents compressed air from the oil separator to the atmosphere when the engine is

Valve turned off.

12 Regulating Valve Automatically regulates engine speed and air volume passing through the inlet

unloader valve by sensing air pressure in the oil separator system and acting

pneumatic cylinder.

13 Minimum Pressure Ensures that excess lubricating and cooling oil is not drawn into the air service lines

and Service Valve by closing automatically when the pressure in the oil separator system drops below

75 psi (517 kPa).

1-17

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MAC TOOLS MW250 Instruções de Operação Página 25