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TM 55-4920-416-13
Section V
NAVAER 17-15C-539
SECTION V
PERIODIC INSPECTION, MAINTENANCE AND LUBRICATION
5-1. GENERAL.
CAUTION
5-2.  This section contains inspection, maintenance and
Valves have a tendency to stick when not
lubrication data for the VPT-7A Vacuum-Pressure Test Set and
used for some time.  If these selectors
provides the necessary information to keep the test set
tend to stick, no damage will result if
functioning properly. It is recommended that instruments be
considerable torque is applied to valves
checked for calibration every three months.
in order to free them.
5-3. INSPECTION.
5-10. VACUUM AND PRESSURE CONTROL VALVES (3, 4,
5, and 6, figure 5-3). Fully open and fully close each control
5-4.  PERIODS OF INSPECTION.  The test set must be
valve. Do not force valves past limit positions. Operation must
subject to a constant and systematic inspection routine.
be smooth and valve action must be firm without binding. If
Inspections are to be at the following intervals:
action is rough and binding is present, replace control valve.
a.  On arrival from manufacturer to depot.
b.  Immediately before use.
5-11. INSTRUMENTS (12, 13, 14, 15 and 16, figure 5-3.)
c.  Sixty day periods during use.
Inspect all instruments for broken glass and bent needles.
Check front panel mounting screws for tightness.
5-5.  ON ARRIVAL FROM MANUFACTURER OR DEPOT.
For detailed inspection procedures in this category, see
5-12.  CASE LEAK TEST VALVES (7, 8, 9, 10 and 11,
figure 5-3). To inspect case leak test valves rotate from normal
position, as shown in figure 5-3, to individual stops using the
5-6. PRE-OPERATION INSPECTION. Before operation, a
number 8 Allen wrench provided. Valves should be checked
complete visual inspection of the test set must be performed by
for ease of operation; sloppiness or binding is sufficient cause
operating personnel. For pre-operation inspection procedures,
for removal of a valve.  For removal procedures refer to
refer to paragraphs 5-7 through 5-11.
Section VI of this handbook.
5-7. OIL RESERVOIR (see figure 5-1). A viewing port on the
5-13. SIXTY DAY INSPECTION PERIOD. Prior to performing
right side access door permits a rapid visual check of oil level
the procedures described for this inspection period, the
and pump operations. The oil level in the reservoir must be
procedures described in paragraphs 5-7 through 5-11 should
above the index mark. If oil level is low, add oil. (See Section
be performed.
III, paragraph 3-6.) If oil is dirty, drain and fill reservoir. (See
Section III, paragraphs 3-6 and 3-7.) For proper operation of
5-14.  LINES AND FITTINGS.  Visually inspect all tubing,
the test set, a free flow of clean oil must be maintained.
connectors and electrical wiring for security and freedom from
Failure to keep equipment in this condition will result in
damage.  Inspect the tubing for evidence of abrasions,
unsatisfactory operation.
punctures, deformities and cracking.  Inspect the electrical
wiring for frayed, burned, cracked or missing insulation.
5-8. OIL SUMPS (see figures 5-1 and 5-2). Viewing ports in
both side doors permit inspection of pressure and vacuum
5-15. POWER SUPPLY (figure 1-3). Inspect all components
sumps for presence of oil. During normal operation, no oil will
of the power supply for security of attachment and condition.
be present in either sump. If oil is found in the vacuum sump,
Connect test set to power (115 V ac 1 ∅ 50- 500 cycles).
vacuum check valve is dirty and not operating properly. Clean
check valve as outlined in paragraph 5-19.  After cleaning
CAUTION
check valve, disassemble vacuum sump and clean and replace
filter as outlined in paragraph 5-20. If oil is found in pressure
Do not operate test set without oil or if an
sump, disassemble and clean as outlined in paragraph 5-20.
excessive amount of oil is visible in the
vacuum or pressure sumps, or in the
5-9. SELECTOR VALVES (1 and 2, figure 5-3). The vacuum
reservoir.  Operation with reservoir dry
and pressure selector valves must be set at each position to
for more than 10 seconds, will damage
check their operation. Inspect for binding or looseness in each
the motor-pump assembly.
Starting
selector position.  A sloppy or too-tight selector must be
pump with oil in sumps will result in
replaced.
For replacement procedures, see Item 15,
22

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