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Section III: PRELIMINARY INSTRUCTIONS
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TM-55-4920-373-14-P Gasoline Engine Driven Hydrualic Systems Test Stand Type D5-B Manual
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OPERATION.
TM 55-4920-373-14&P
SECTION IV
OPERATING DETAILS
Flow control by use of the 1/2-inch flow con-
WARNING
trol valve (16) or 3/4-inch flow control valve
(19) dependent upon which outlet is used
Keep 10 feet clear of aircraft engine and
fuel tank area.
Reservoir shut-off valve (15) open if test
stand reservoir is being used or closed if
2-7. GENERAL.
external reservoir is being used
2-8. There are three modes of operating the test
WARNING
stand as pertains to fluid flow from the test
stand to the system under test and return to the
Do not connect or disconnect hoses while
test stand. These are as follows:
system is under pressure or with fluid
bypass valve closed.
1. Mode-1. Flow out of the l/2-inch outlet
and return through the 3/4-inch outlet to the test
2-9. HOSE CONNECTIONS. Connect the appro-
stand reservoir.  For this mode the following
priate hoses from the test stand to the respective
valves must be positioned during operation as
connectors on the system to be tested. Hose
follows: (See figure 2-1.)
fittings not in use during test stand operation
should be capped.
Outlet selector valve (17) to the 1/2-inch
outlet
2-10. ENGINE START UP. Start up engine on
test stand as follows:
Reservoir shut-off valve (15) open
3/4-inch flow control valve (3/4) open during
WARNING
operation
Noise hazard. Operation of this equip-
Flow control by use of the l/2-inch flow
ment presents a noise hazard to person-
control valve (16)
nel in the area. The noise level exceeds
2. Mode-2. Flow out of the 3/4-inch outlet
the allowable limits for unprotected per-
and return through the l/2-inch outlet to the test
sonnel; wear ear muffs or ear plug which
stand reservoir.  For this mode the following
are fitted by a trained professional.
valves must be positioned during operation as
follows: (See figure 2-1.)
1. Insure that all valves are positioned as
Outlet selector valve (17) to the 3/4-inch
described in paragraph 2-6.
outlet
2. Insure that high pressure bypass valve
Reservoir shut-off valve (15) open
(item 2, figure 2-1) is in the full open position,
allowing engine to be started under no load
l/2-inch flow control valve (16) open
condition.
during operation
3. Pull out and keep out the positive action
Flow control by use of the 3/4-inch flow
ground switch (item 3, figure 2-3) located at the
control valve (19)
bottom of the engine magneto end cover.
3. Mode-3. Flow out through either the l/2-
4. Pull choke control (item 1, figure 2-2)
inch outlet or the 3/4-inch outlet, return through
out approximately midway.
the l-inch suction return. Test stand reservoir
may be either in the system or out of the system
5. Pull throttle (item 3, figure 2-2) and twist
if aircraft reservoir is being used. For this
to lock to one-quarter open position.
mode the following valves must be positioned
during operation as follows: (See figure 2-1.)
6. Set ignition switch to ON position (item 2,
Outlet selector valve (17) to either the l/2-
7. Set the starter switch (item 5, figure 2-2)
inch outlet or 3/4-inch outlet
to up position and hold until engine starts, then
release switch.
2-8  Change 1

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