Chapter 2. OPERATING INSTRUCTIONS - TM-55-4920-405-13-P0025

TM 55-4920-405-13&P

CHAPTER 2

OPERATING INSTRUCTIONS

Section I. CONTROLS AND INSTRUMENTATION

See figures 2-1 and 2-2 for the locations of the indi-

2-1. LOCATION AND FUNCTION. All controls and

vidual controls and instruments. Refer to tables 2-1

instrumentation used in operation of the test stand

and 2-2 for the functions of these items.

are mounted conveniently on the two control panels.

Section II. OPERATING PROCEDURES

WARNING

f. Connect the 1/2 inch outlet hose assembly and

the 3/4 inch suction hose assembly to the 1/2"

Keep test stand at least 10 feet away from

OUTLET anti SUCTION RETURN ports at the

aircraft engines and fuel tank areas during

rear end of the test stand. Connect the other

operation. To prevent carbon monoxide

ends of the hose assemblies to the system you

poisoning, never operate the test stand in

are going to test.

a closed building unless the exhaust is

piped out.

2-3. ENGINE START-UP. To start the engine, do

the following:

2-2. PRELIMINARY SETUP. To set up the test

WARNING

stand for operation, tow it to the operating area and

do the following:

Operation of this equipment presents a

noise hazard to personnel in the area.

a . Set the parking brake at the front end of the

test stand.

The noise level exceeds the allowable

b. Open all engine compartment and control panel

limits for unprotected personnel; wear

doors and fasten them in the open position.

ear muffs or ear plugs which were fitted

c. Set the hydraulic valves (figure 2-1) as follows:

by a trained professional.

(1) Turn PRESSURE COMPENSATOR (16)

counterclockwise to open.

(2) Turn COMPENSATOR SHUTOFF VALVE

(17) counterclockwise to open.

Make sure that all valves have been set accord-

(3) Turn FLOW CONTROL VALVE (12) clock-

ing to paragraph 2-2c.

wise to close.

Make sure that HIGH PRESS BYPASS VALVE

(4) Turn HIGH PRESS RELIEF VALVE (19)

control (19, figure 2-1) is set to OPEN. This

counterclockwise to open.

setting allows the engine to be started with no

(5) Turn FLUID PRESS GAGE SHUTOFF

load.

valve (22) counterclockwise to open.

Pull out positive action ground switch (3, fig-

(6) Set HIGH PRESS BYPASS VALVE (19) to

ure 2-3) at the bottom of the engine magneto

OPEN.

end cover. Leave the ground switch in the full

(7) Set SUCTION PRESSURE FILTER-OUT

out position.

control (21) to FILTER-OUT.

Pull CHOKE control (1, figure 2-2) out about

(8) Turn VOLUME control (14) counterclock-

half way.

wise to zero flow.

Pull THROTTLE (3, figure 2-2) and twist it to

(9) Set RESERVOIR valve (15) to IN.

lock at the one-quarter open position.

d. Make sure that the hydraulic system has been

Set IGNITION SWITCH (2, figure 2-2) to ON.

prepared for use as directed in paragraph

Set STARTER switch (5, figure 2-2) to the up

position. Hold the switch in this position until

e. Make sure that there is enough gasoline in the

the engine starts, then release the switch.

fuel tank for the complete test that you intend to

Open the choke slowly by pushing in CHOKE

perform. A full tank (about 20 gallons) will pro-

control (1, figure 2-2) until the engine is run-

vide at least 4 hours of continuous operation.

ning normally with the CHOKE control pushed

all the way in.

Using THROTTLE (3, figure 2-2), adjust the

CAUTION

.---- --

engine speed to between 1000 and 1400 RPM.

The engine RPM can be read on TACHOMETER

Keep the engine compartment top and side

HOUR METER (1, figure 2-l). Run the engine

doors fastened in the open position whenever

you operate the engine.

2-1