Pressure Control Calibration - Graco GM 5000 Instructions And Parts List

Pressure
Control
WARNING
tion procedure to reduce the risk of a fluid injection sprayer performance.
Use extreme caution when performing this calibra- the maximum working pressure, resulting in poor
injury or other serious bodily injury, which can result
from component rupture, electric shock, fire, explo- NRlERattempt to increasethe fluid outlet pressure by
sion or movino Darts. Derformino these calibrations in anv other wav. Never
Perform this procedure whenever the pressure control sion.
assembly is removed and reinstalled, or replaced, to
be sure the sprayer is properly calibrated.
ALWAYS use a new 50 foot (1 5.2 m) spray hose, rated
for at least 3000 psi (21
0 bar) Maximum Working Pres-
pressurize and result in component rupture, fire or ex- der-rated hose could develop a high pressure leak or
Improper calibration can cause the sprayer to over- sure, when performing this procedure. A used, un-
plosion.
It
may also prevent the sprayer
from obtaining rupture.
Service Tools Needed:
New 50
foot
(15.2
rn),
3000 psi
(210 bar),
flexible
nylon
airless
spray
hose, Part No.
223-541
0-5000 psi
(0-350
bar)
fluid-filled pressure
gauge,
Part No. 102-1114
New
spray
tip,
size 0.025 to
0.029
318
in.
imition
wrench
or nut driver
~ ~
."
_ .
5gallonpail
of water
or mineral
spirits
Swivel,
156-823
1
-
104-984
Y A
162 -453
Nipple,
162-453
Tee,
104-984
Set Up
1. Follow the Pressure Relief Procedure Warning
on
2. Set up the system as shown in Fig. 30.
Set the Dead Band (Pressure Differential)
1. Remove the pressure control cover.
NOTE
Do
not alter this adjustment if the wheel is al-
ready set as shown in Fig. 31.
2. Set the white differential wheel (A) on the micro-
switch. Turn the wheel so the letter
F
is concealed
behind the switch and the letter E
is
the first letter
seen.
page
4.
Pressure
Up
1. Start the sprayer and prime it.
2. Adjust the pressure to
2600
psi (180 bar).
3. Shut off the engine.
If the pressure drops after the
engine is shut off, replace the pump packings be-
fore proceeding. See page 26.
Adjust the Pressure
See Fig. 32.
1.
remove
the plug (320)
in
the bottom of the pressure
-
control.
2.
Turn and hold the pressure control knob (B)
at
the
'
maximum pressure.
3. Engage the nut (C): Insert the nut driver through the
pressure control hole
(D),
or use an ignition wrench
inserted from the front of the pressure control.
I
))e
223-541
a. Loosen the nut just until you hear a click. Stop.
b. .Slowly tighten the nut just until another click is
4. Replace the plug (320) and the pressure control
heard. Stop.
cover.
308-105
29