Operating instructions

12. Hydraulic Pressure Gage
13. Pump Handle Assembly and Handle Shoe
The hydraulic pressure gage (2) in-
The action of the pump handle assembly
dicates the amount of pressure applied
(4B) and handle shoe (4A) actuates the
when testing the various types of nozzles.
plunger built within the body and plunger
The dial has a range of O to 5,000 psi
assembly (4), and producing a hydraulic
(pounds per square inch) and marked in
pressure which is recorded on the hy-
increments of 50 psi.
draulic pressure gage (2).
Section Ill. OPERATION
Note: The key numbers shown below in parentheses in this section refer to figure 1.
14. General
This section contains instructions for the
operation of the nozzle tester under condi-
tions of moderate temperatures and hu-
midity. Every organization equipped with
this item must thoroughly train its per-
sonnel in the procedures for operating
this item.
15. Preparation for Operation
a. Mount the nozzle tester (fig. 1) on a
bench and secure with three 3/8-inch bolts,
washers, and nuts. For portable use, mount
on wooden or metal base 5 inches wide x
15 inches long. Use 3/4-inch plywood or
l/2-inch sheet steel.
b. Slide the pump handle assembly (4B)
onto the handle shoe (4A) located in the
base of the nozzle tester. Solid shaft in the
pump handle assembly may be extended or
telescoped, depending on 1 e v e r a g e re-
quired.
c. Remove the fuel reservoir cover (lC)
from the fuel reservoir (1A) with a com-
bined twisting and pulling motion. Fill the
fuel reservoir with test fluid and install
the fuel reservoir cover.
d. Open the valve handle (3B) and make
several strokes with the pump handle as-
sembly (4B) to prime the nozzle tester.
Close the valve handle.
Note. A vent screw (4C) is located on the side of
the housing behind the lower discharge outlet (3E)
and can be opened for thorough venting and priming
if necessary.
16. Operation
a. Discharge Block Assembly. The dis-
6
charge block assembly (3) has two dis-
charge outlets to facilitate the various
tests. When nozzle under test is connected
to lower discharge outlet (3E) and with
hydraulic pressure gage valve assembly
(3C) closed, this shuts off and protects the
hydraulic pressure gage (2) during rapid
and prolonged pumping periods when flush-
ing nozzle or observing spray form. Using
upper discharge outlet (3D) and closing
hydraulic pressure gage valve assembly
(3C) isolates hydraulic pressure gage (2)
and the nozzle under test from the nozzle
tester (fig. 1) permitting leakage rates or
pressure drop measurement tests.
Note. Install and tighten cap nut assembly (3F) on
discharge outlet not in use.
b. Mounting Instructions. Mount the fuel
injector nozzle to be tested on the nozzle
tester in accordance with the connecting
instructions (fig. 2) using connector set
4910-955-5517 (1, fig. 6).
Note. Connector set 4910-955-5516 (2, fig. 6) is
connected in a similar manner as connector set
4910-955-5517 (1, fig. 6).
c. Testing Nozzles.
(1) General. For the v a r i o us tests,
connect the nozzle to the discharge
outlets, as prescribed in (2), (3),
(4) and (5) below. Use the spray
collector cup (2, fig. 5) for catch-
ing the test fluid. For best results,
tip of nozzle should be well cen-
tered in the cup.
Warning: Be careful of the pene-
trating power of the atomized test
fluid under pressure as it is suffi-
cient to puncture the skin permit-
ting test fluid to enter wound and