Chapter 2. OPERATING INSTRUCTIONS - TM-9-4940-421-140011

TM-9-4940-421-14 Shop Equipment Contact Maintenance Truck Mounted (Southwest Model SECM) Serial No. Range SECM 1001 Thru SECM 2532 Manual
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TM 9-4940-421-14

CHAPTER 2

OPERATING INSTRUCTIONS

Section I. OPERATING PROCEDURES

2-1. GENERAL. This section describes the various

f. Throttle Control The throttle control (fig 2-1) is

controls and instruments and provides the operator or

used to adjust engine speed to the desired rpm. Turn

crew sufficient information to operate the shop set.

the handle counterclockwise and pull out to decrease

rpm and push in to increase rpm. Pull out to idle and

2-2. CONTROLS AND INSTRUMENTS.

push in to run.

a Frequency Meter. The frequency meter (fig 2-1)

g. Ignition Switch. The ignition switch (fig 2-1) is a 3

indicates the output power of the welder when driven

position switch, used to start and stop the shop set

by the gas engine. Normal reading is 60 hertz when the

engine.

engine is driving the welder at 1800 rpm.

h. Circuit Breakers. There are five circuit breakers

b. Running Time Meter. The running time meter

(fig 2-l). Three 15A circuit breakers protect the recep-

(fig 2-1) denotes hours of operation.

tacles and body wiring circuits. The 30A circuit

c. Oil Pressure Gage. The oil pressure gage (fig 2-1)

breaker protects the air compressor circuit. The 40A

indicates the engine oil pressure. Abnormal oil pres-

circuit breaker protects the main power circuit.

sure, the needle should point to the green. If the needle

i. Receptacles. The receptacles (fig 2-1 ) are 115 volt

points to the red, stop the engine and determine the

single-phase. Receptacles J1 and J2 are the twist-lock

cause for low oil pressure.

type and J3 and J4 are the three-prong type.

d. Buttery Ammeter. The battery ammeter (fig 2-1)

j. D. C. Ampere Selector Switch. The switch (fig 2-1)

measures the dc current flow to and from the battery.

is used to select the welding ampere range required for

It is calibrated in 10 ampere increments from -30 to

all welding to be accomplished. Each welding ampere

+30. Normal indication of the meter is dependent upon

range shown on the switch shows a minimum and max-

the charge of the battery. A low charge, such as exists

imum for the range selected, and should be further ad-

immediately after engine starting, will result in a high

justed with the dc ampere adjusting rheostat.

reading. When the charge has been restored to the bat-

tery the indicator should read near 0.

k. D. C. Ampere Adjusting Rheostat. This rheostat

e. Choke Control The choke control (fig 2-1) is used

(fig 2-1) regulates the dc welding amperage within the

to increase fuel intake for initial starting and warm up

ampere range selected at the dc ampere selector

of a cold engine. Pull out to start engine and push

switch. Turn the adjusting rheostat clockwise to in-

slowly as the engine warms up. Push choke in during

crease the welding amperage and counterclockwise to

normal operation,

decrease the amperage.

2-1

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