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D
C
Fig 18
NOTE: Refer to Fig 18 for the remainder of this
procedure.
3. Remove the plug (311). See Fig 18.
4. Open the needle valve slightly. Turn the
pressure adjusting knob (A) to the minimum
setting.
5. Plug in the sprayer and turn the switch ON.
Increase the pressure just enough to start the
sprayer. Fully prime the hose, being sure to
eliminate all air from the system.
NOTE: In Step 6, the slower the pressure is
raised, the easier it is to note the exact
stall pressure. Closing the needle valve
quickly causes the pressure to rise too
fast which gives a false reading.
PRESSURE CONTROL ADJUSTMENT
ON/OFF SWITCH
A
B
TIGHTEN
311
0750
6. Open the needle valve a just enough to allow
the pump to run continuously, and turn the
pressure adjusting knob to maximum. Very
slowly start to close the needle valve. Observe
the pressure at which the pump stalls, which
should be approximately 2750 psi (190 bar).
If the pressure is lower than 2750 psi (190 bar):
Unplug the sprayer and relieve pressure. In-
sert the wrench through the hole (C) and loos-
en the adjustment nut (B) 1/8 turn or less. Re-
peat steps 5 and 6.
If the pressure is higher than 2750 psi (190 bar):
Unplug the sprayer and relieve pressure. In-
sert the wrench through the hole (C) and tight-
en the pressure adjustment nut (B) 1/8 turn or
less. Repeat steps 5 and 6. Repeat this proce-
dure until the proper stall pressure is obtained.
7. Now check to see at what pressure the spray-
er starts to run again after it stalls. Plug in the
sprayer, turn it on, close the needle valve, and
set the pressure at maximum. Allow the spray-
er to run until it stalls.
8. Open the needle valve very slowly while ob-
serving the pressure gauge. Check to see if
the pressure drops to approximately 2300 psi
(161 bar) before the sprayer starts again.
If the pressure is not 2300 psi (161 bar):
Shut off and unplug the sprayer, but do not
relieve pressure. Turn the differential wheel
(D) just one notch and repeat Steps 5 and 6.
Check the pressure drop again, and repeat if
necessary.
NOTE: If you adjust the differential wheel,
recheck the stall pressure (steps 5 and 6)
to be sure the it has not changed.
9. Relieve pressure. Flush the water out with
mineral spirits. Relieve pressure. Install the
plug (311). Remove the test equipment.
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