Air-Operated Pump

TM 55-4940-353-13&P

d. Air Lubricator (8, figure 2-1). Through the sight

150:1). Close the oil control valve (13) and allow the

pump to build up a stable pressure.

dome on the air lubricator, time the injection of oil into

the air stream. (Refer to figure 4-4. ) It should be three

3. Monitor the output pressure on the manifold

drops per minute. The oil flow may be adjusted by

oil pressure gages (15 & 16) and compare to that

rotating the adjusting screw; counterclockwise for more

calculated in step b.

oil flow, clockwise for less.

e. Air Pressure Regulator (3). Remove the bottom

NOTE

plug and check for contamination. If contamination is

visible, clean plug, body, and valve seat using solvent

A record of any deviation should be

conforming to PD-680, Type II.

maintained so that any necessary

adjustments to obtain the correct pressures

f. Air Filter (2). Remove rigid filter element, tap

during the hose test may be made.

on hard surface, and blow off with air blow gun.

NOTE

g. Air-Operated Pump (10). With a hose (21)

connecting the output oil manifold (18) with the oil return

As the moving parts within the pump

port and adaptor fitting (14) conduct a series of tests at

become worn, the ratio between the air input

various air input pressures.

pressure and the oil output pressure will

drop slightly. The operating air pressures

1. Set the air pressure regulator (3) and open

should be revised accordingly.

the air control valve (9).

4. Following this series of tests the Hose

2. Compute the ratio of the air input pressure

Tester may be shut down using the normal operating

to the oil output pressure. (It should be approximately

procedure.

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