Section III. PREPARATION FOR USE, STORAGE OR SHIPMENT

TM 55-4920-416-13

NAVAER 17-15C-539

Sections II and III

SECTION II

SPECIAL TOOLS

2-1. GENERAL. There are no special tools required to

operate and service the VPT-7A Vacuum-Pressure Test Set.

SECTION III

PREPARATION FOR USE, STORAGE OR SHIPMENT

3-1.

PREPARATION FOR USE, ON ARRIVAL FROM

b. Open right-hand door by releasing the Dzus fasteners

DEPOT.

along door edge, and pull out DRAIN-FILL hose (3).

c. Turn DRAIN-FILL selector valve (2) to FILL.

3-2. UNPACKING.

No special unpacking procedures are

d. Dip the end of DRAIN-FILL hose into the container of

required.

oil.

e. Open all four control valves (5).

3-3. INSPECTION. A complete visual inspection of the unit

f. Set VACUUM and PRESSURE selector valves (6) at

should be made by operating personnel. Inspect for security of

OFF.

attachment and condition of tubing and fittings, wiring harness

g. Throw power switch (7, figure 4-1) to ON.

and general condition of all components. Examine the unit for

h. Run pump until reservoir level is at index marks on

burrs, scratches, dents, loose screws and nuts, improper or

reservoir casting.

damaged safety wire. Check the multiple selector valves and

i. Lift end of DRAIN-FILL hose out of the oil and hold in

control valves for ease of operation to make sure that they

upward position until all the oil is sucked out of the hose.

have not become stuck during storage or shipment. Multiple

j. Turn DRAIN-FILL selector valve to RUN.

selector valves have a tendency to stick when not used for

k. Throw power switch to OFF.

some time. If these selector valves tend to stick, no damage

l. Place DRAIN-FILL hose in storage compartment;

will result, if considerable torque is applied to valves in order to

close door and engage Dzus fasteners.

free them. Use a quick-coupling to check the coupling nipples

at the rear of the test set for ease of operation.

3-7. DRAINING THE RESERVOIR (See figure 3-1). To drain

reservoir, proceed as follows:

3-4. POWER REQUIREMENTS. Power requirements for

a. Connect proper power cable to receptacle at rear of

operation of test set are listed in Section I, Table 1-2.

test set.

b. Open right-hand door by releasing the Dzus fasteners

3-5. OIL SUPPLY REQUIREMENTS. The test sets are

along door edge and pull out DRAIN-FILL hose.

shipped from the manufacturer with the reservoir fully drained.

c. Turn DRAIN-FILL selector valve to RUN.

The reservoir holds approximately 8 fluid ounces of oil. Oil

d. Dip the end of DRAIN-FILL hose into suitable

requirements vary depending upon environmental conditions.

receptacle.

Two different types of oil are supplied for use with the test set;

e. Open vacuum control valves.

one of these, the HT-1 Hydraulic Oil, is used for operation in

f. Close pressure control valves.

the normal operating range of -32 to 71C (0 to 160 F), the

g. Set PRESSURE selector at FUEL PRESSURE.

h. Set VACUUM selector at OFF.

other LT-1, is used for operation in the range from -40C to 0C

i. Throw power switch to ON.

(-40 to 32F).

j. Open pressure control valve until fuel gage reads

approximately 20 psi.

3-6. FILLING THE RESERVOIR (See figure 3-1). When

k. Throw power switch to OFF.

reservoir is to be filled with oil, proceed as follows:

l. Turn DRAIN-FILL selector valve to DRAIN.

a. Connect proper power cable to receptacle (4) at the

m. If reservoir does not drain completely, repeat

rear of the test set.

procedure.

n. Turn DRAIN-FILL selector valve to RUN.

o. Collect oil in a suitable container and discard.