Vacuum Pump.

TM 5-6640-212-14

(2) Oil level gage. The oil level within the

2-3. Vacuum Pump.

vacuum pump is indicated in the window on the side of

the pump.

a. Description. The vacuum pump (fig. 2-1)

(3) Vacuum pressure gage. The vacuum in

consists of a two-stage pump and a one-half horsepower

inches of mercury (HG) is indicated on the vacuum

electric motor mounted on a common base. The base is

pressure gage (located on the main control panel (fig. 1-

mounted on an elevated shelf on the left wall of the utility

3).

compartment adjacent to the air compressor. Power

transmission from drive motor to pump is by V-belt and

c. Operation.

pulleys. The pump is connected through the van utility

system piping (fig. 1-7) to the laboratory compartment

outlets. The pulley-belt combination provides for a speed

(1) Check to see that all vacuum pressure line

of 525 revolutions per minute. The pump has a 58-liter

valve outlets in the laboratory compartment are closed.

per minute free air capacity, with a vacuum of 0.1 micron

(2) With the intake closed to minimize splashing,

(0.001 mm. Hg).

turn on the power.

(3) With the pump running, check the oil for

b. Controls and Instruments.

proper level. A gurgling noise, sometimes detected at

high pressures, should disappear after a few seconds. If

(1) Electrical Controls. Operation of the vacuum

it does not, check to see if the oil level is too low or if

there is a leak in the connecting lines.

pump is controlled by the vacuum circuit breaker on the

main control panel (fig. 1-4).