Vacuum Pump - TM-5-6640-213-140085

TM 5-6640-213-14

Vacuum Pump.

(1) Lubrication. Use the correct and the proper amount of

oil; excessive lubrication rarely does as much harm as inadequate

lubrication. Only nondetergent oils may be used. Recommended

lubricating oils are listed below.

(a) SAE 10 non-detergent for ambients below 100

degrees F (37.9 degrees C) (fig. 3-1).

This is a dry air pump, and liquids must not be

allowed to enter the intake. In vacuum filtration,

a second side-arm flask should be used as a trap,

connected between the side arm of the filtrate

receiving flask and the pump vacuum air inlet (fig.

3-2). With aqueous liquids, a small amount of

silica gel in the trap flask will absorb any water

vapor and prevent rusting.

NOTE

To ensure proper lubrication of the rotor and pump

vanes, before using the pump for the first time,

connect the pump to the proper electrical outlet

and run it free to the atmosphere (without load)

for about 5 minutes. This precaution should be

repeated whenever the pump is used for vacuum

filtering aqueous solutions, to prevent rusting

due to entrained water vapor.

(b) Military Symbol PE-10 (MIL-L-21260, Type I).

(2) Starting. If motor fails to start or hums, pull the

plug and check for correct voltage as shown on the motor nameplate.

Also examine the plug and switch. Some motors are equipped with

overloads that turn the current off automatically when subjected

to mechanical or electrical overload. If the unit is extremely cold,

bring it to room temperature before starting.

(3) Flushing. Most pump trouble can be corrected by

flushing rather than taking the pump apart. A noisy or inefficient

pump is frequently nothing more serious than a vane or vanes stuck in

a rotor slot due to excessive oiling or heavy oil. Remove the inlet

and outlet accessories and add a tablespoon of kerosene slowly at the

intake while the unit is running. Lay unit on its side with outlet

downward so kerosene will work out again. Return the pump to the

upright position, place three to five drops of oil in the intake port

and reattach the accessories.

3-13