CHAPTER 1 THEORY - TM-11-4940-204-350002

CHAPTER 1

THEORY

Section I. GENERAL

this equipment includes TM 11-4940-204-12 and TM 11-

Scope

4940-204-15P.

a. This manual covers field and depot maintenance

c. Forward comments concerning this manual to

for Degreaser MX-1760/G (degreaser).

It includes

the Commanding Officer, U.S. Army Signal Materiel

instructions appropriate to third, fourth, and fifth echelons

Support Agency, ATTN: SIGMS-PA2d, Fort Monmouth,

for testing and repairing the equipment and replacing

N. J.

maintenance parts. It also lists tools, materials, and test

Note:

equipment for third, fourth, and fifth echelon

maintenance. Detailed functions of the equipment are

For applicable forms and records, see

covered in paragraphs 3 and 4.

paragraph 2, TM 11-4940-204-12.

b. The

complete

technical

manual

for

Index of Equipment Publications

Refer to DA Pamphlet 310-4 to determine what

changes to or revisions of this publication are current.

Section II. MECHANICAL AND CIRCUIT THEORY

b. Ac Motor (fig. 1). The 5.7-ampere reversible

Mechanical Theory

alternating current (ac) motor used in the degreaser

requires single phase, 115-volt, 60-cycle-per-second

Degreaser MX-1760/G contains a centrifugal pump (a

power for operation.

The motor is rated at 1/3

below) which draws Cleaning Compound (Federal stock

horsepower at 1,725 revolutions per minute (rpm). A 4-

No. 7930-396-3420) from an integral reservoir and

inch single-grooved pulley for a V-belt is mounted on the

sprays the cleaning compound under pressure against a

motor shaft.

turntable which is free to rotate. The cleaning compound

c. Electrical Switch Timer (fig. 1). The electrical

loosens grease and dirt from parts placed on the

switch timer consists of a clock mechanism and contact

turntable and the force of the spray rinses the parts

points. The electrical switch timer operates the ac motor

clean. The centrifugal pump is driven by an electric

for a selected time period of up to 30 minutes maximum.

motor (b below) that is controlled by an electrical switch

If the automatic cutoff feature is not desired, the

timer (c below).

electrical switch timer consists be manually operated to

Warning:

the HOLD position, as long as necessary, by the rotation

Cleaning compound is flammable and

of the control knob, and then to the 0 position for cutoff.

its fumes are toxic. Do not use near a

flame; provide adequate ventilation.

Circuit Theory

(fig. 1)

a. Centrifugal Pump (fig. 3). A centrifugal pump is

used to build up pressure. The impeller draws cleaning

The ac input power is applied from one terminal of

compound from the reservoir through the intake of the

Connector Plug UP-121/M to terminal 1 of the electrical

casing (22), and applies it under pressure through the

switch timer, through the switch contacts to terminal 2

outlet (23) to the sprays. A conventional stuffing box

packed with graphite-impregnated asbestos forms a seal

between the shaft and the casing.