Disassembly - TM-5-6640-213-140087

TM 5-6640-213-14

DO NOT at any time remove the rotor from the rotor

housing. Wash vanes, end plate and pump chamber

with solvent. Dry and relubricate lightly.

(4) Disassembly. If foreign matter has entered the pump,

try flushing. If this does not eliminate the foreign matter, remove

only the end plate and the four vanes.

(5) Alignment. If the air system fails to produce the

proper vacuum or pressure, the top clearance between the rotor and

body may have increased. A metallic clanging could mean the rotor

and body are touching. Remove the end plate only and set top clear-

ante between 0.0005 and 0.001 inch (0.013 mm to 0.037, mm). This can

be done by tapping lightly with a miniature hammer on the pump body,

either top or bottom, depending upon whether the clearance is too

great or too little. The rotor should be turned while setting

clearance so that all points on the circumference of the rotor will

clear. The end clearance, total for both sides of rotor, may vary

from 0.0015 to 0.002 inch (0.038 mm to 0.05 mm). This clearance is

maintained by means of paper gaskets on the motor side of the body.

Do not loosen bolts on either the body or rear end

plate (bracket).

(6) Operation.

(a) Plug in pump motor to the proper electrical out-

let, and connect the appropriate hose adapter to the intended load

(vacuum or pressure). The adapter fittings are clearly marked. For

pressure operation, hose clamps should be used.

(b) Turn on the pump, and adjust vacuum or pressure

to the. desired level by turning the stem of the regulator valve

located under the appropriate gage while watching the gage indication

inlet is greatly reduced, also reducing lubrication by the oil mist

picked up from the oiler wick. Therefore the pump should be run

without load (no connected vacuum flask) at least 2 to 3 minutes for

every hour of vacuum operation. It is good practice to do this at

the end of each filtration, in filtering small or moderate volumes.

(d) If vacuum cannot be interrupted for these short

intervals, an accessory Siphon Oiler will provide lubrication for

continuous operation. Remove the vacuum regulator valve, and install

the Oiler in its place, filled to the marked level with SAE 10 oil.

The vent hole required for siphon action causes a slight reduction in

maximum vacuum. Refill the Oiler after every 20 to 50 hours of oper-

ation. The Oiler must be removed and the regulator valve replaced,

if the pump is later used as a pressure source.

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