Chapter 3: OPERATOR/ CREW MAINTENANCE INSTRUCTIONS

TM 5-4130-234-13&P

CHAPTER 3

OPERATOR/ CREW MAINTENANCE INSTRUCTIONS

Section I. LUBRICATION INSTRUCTIONS

c. To accelerate oil draining, operate vacuum pump

3-1.

General

and partially cover exhaust valve (3) with finger. After

Lubrication of the service unit consists of filling, changing,

completion of oil draining, stop vacuum pump and close

and flushing the vacuum pump oil.

valve (30, fig. 5-2).

CAUTION

3-2.

Fill vacuum pump oil as follows:

Do not use solvents or light flushing

NOTE

oils. Their complete removal is difficult

The oil level indication through glass disk

(7, fig. 6 11 will be slightly higher with the

and their higher vapor pressure will

pump running than when pump is

prevent the attainment of a good

stopped. Overfilling the pump above

vacuum.

glass disk level will tend to create

splashing during the passage of free air

d. To flush the vacuum pump, remove cap (12, fig. 6-

through the pump.

1) and pour 3 to 4 ounces of clean oil from container (12,

a. Remove cap (12) and using oil (12, fig. 5-2), fill pump

fig. 5-2). Leave exhaust valve port open and operate

to indicate on bottom of glass disk. Replace cap.

vacuum pump for a short period to completely circulate the

new oil. Open valve (30) to drain and force out residue.

3-3.

Flush and charge vacuum pump oil as follows:

e. Repeat flushing procedure until flushing oil remains

NOTE

clean and free from discoloration and foreign matter. Stop

Oil will drain more easily if oil is warm. To

vacuum pump and close valve (3, fig. 6-1).

accelerate draining, operate vacuum pump

f. Remove cap ( 12 ) and using oil from container

in accordance with Chapter 2 to warm oil.

(12, fig. 5-2), fill vacuum pump to indicate on bottom of

a. Place a container, of at least one-half gallon

glass disk. Replace cap.

capacity, under valve (30, fig. 5-2).

g. Start vacuum pump.

A gurgling noise is

b. Stop vacuum pump, and open valve (30) to drain

characteristic when high pressure air is drawn through

oil.

vacuum pump. Noise should disappear quickly as the

CAUTION

intake pressure is reduced. If vacuum pump continued to

Do not completely close exhaust valve

gurgle, the oil level may be too low. Add oil until glass disk

(3, fig. 6-1); undue pressure will be built

indicates proper level. Oil level must be maintained within

the limits of glass disk, with the vacuum pump running.

up within pump.

Section II. OPERATOR/ CREW PREVENTIVE MAINTENANCE

CHECKS AND SERVICES

has ceased. Stop operation immediately if a deficiency is

3-4.

General

noted during operation which would damage the equipment

To insure that the service unit is ready for operation at all

if operation were continued. All deficiencies will be

times, it must be inspected systematically so that defects

recorded together with the corrective action taken on DA

may be discovered and corrected before they result in

Form 2404 (Equipment Inspection and Maintenance Work

serious damage or failure. The necessary preventive

Sheet) at the earliest possible opportunity.

checks and services to be performed are listed in table 3-1.

The item numbers indicate the sequence of minimum

3-5.

Preventive Maintenance Checks and Services

inspection requirements.

Defects discovered during

operation will be noted for future correction to be made as

The operator/crew preventive checks and services are

soon as operation

listed in table 3-1.

3-1