Operating instructions
(2)
(3)
8
may cause blood poisoning. Keep
hands free of spray at all times.
Opening Pressure. Use lower dis-
charge outlet (3E). Open the hy-
draulic pressure gage valve as-
sembly (3C), operate the pump
handle assembly (4B) slowly and,
when nozzle begins to spray test
fluid, observe the pressure indi-
cated on the hydraulic pressure
gage (2). This pressure should be
compared with that specified by the
engine manufacturer and nozzle
adjusted, if necessary, before pro-
ceeding with further testing. Test
should be repeated several times
to be certain that nozzle consist-
ently opens at the same pressure
each time.
Spray Pattern.
Use lower dis-
charge outlet (3E). Close the hy-
draulic pressure gage valve as-
sembly (3C) and operate the pump
handle assembly (4B) at approxi-
mately 15 strokes per minute.
Make sure that all spray holes are
open and are spraying the same
amount of test fluid. The spray
formation should be sharp with a
rather solid pattern and the angles
formed by the individual sprays
should be uniform. A missing sec-
tion or uneven spray pattern indi-
cates clogged or eroded orifices.
(4)
(5)
Sample spray patterns are gener-
ally shown in the engine manual.
Chatter. Use lower discharge out-
let (3E). Close the hydraulic pres-
sure gage valve assembly (3C) and
operate the pump handle assembly
(4B) approximately two seconds.
The nozzle chatter must be distinct
and regular. A sharp pitch sound
is not mandatory, and an oc-
casional skip or variation in the
chatter sound pitch is acceptable.
When nozzle chatter is not satis-
factory and does not improve with
continued operation of the pump
handle assembly, replace the noz-
zle.
Leakage. Use lower discharge out-
let (3E). Open the hydraulic pres-
sure gage valve assembly (3C) and
opera t e pump handle assembly
(4B). During prolonged pumping,
drops of test fluid should not form
at tip of the nozzle. A second check
for leakage can be made by main-
taining pressure just below opening
pressure and checking for test fluid
leakage from tip. If this test is to
be used, reconnect nozzle to upper
discharge outlet (3D) and close the
hydraulic pressure gage valve as-
sembly (3C) to time pressure drop.
Some manufacturers specify per-
missible leakage rates.