Pressure Control Adjustment - Graco 231–034 Instructions And Parts List

Pressure Control Adjustment

Use extreme caution when performing this adjustment procedure to reduce the risk of a fluid injection in-
jury or other serious injury which can result from component rupture, electric shock, fire, explosion, or moving
parts.
This procedure sets the sprayer to 3000 psi (210 bar)
Maximum Working Pressure and sets the overpres-
surization switch (microswitch) to approximately 3600
psi (242 bar).
Perform this procedure whenever the pressure con-
trol is removed, installed or replaced, and whenever
a new circuit board is installed.
An improper adjustment can cause the sprayer to
over–pressurize and result in component rupture, fire
or explosion. It can also prevent the sprayer from
obtaining the maximum working pressure, resulting in
poor sprayer performance.
WARNING
To reduce the risk of a serious injury, follow the
Pressure Relief Procedure on page 4 whenever
you are instructed to relieve the pressure.
These tools are required for the pressure control
adjustment.
3/8 inch nut driver or 3/8 inch socket wrench
1/4 inch open–end wrench
7/16 inch open–end wrench
0 – 5000 psi, oil-filled pressure gauge,
Part No. 102–814
Pail of clean water
Mineral spirits
New spray hose,
3000 psi (210 bar) maximum working pressure,
Part No. 223–541
1. Relieve the pressure.
2. Replace the plug (A) at the top of the fluid filter
with a gauge. Connect the gun to the new spray
hose. Connect the hose to the outlet (B). See Fig.
21.
3. Remove the cover of the pressure control.
WARNING
Never try to increase the maximum working pressure
beyond 3000 psi (210 bar) by performing these ad-
justments in any other way. Normal operation of the
sprayer at higher pressures may result in component
rupture, fire, or explosion. To perform this adjust-
ment, however, the sprayer pressure must be tempo-
rarily increased above the normal working pressure.
Use a new, 50 ft (15.2 m) spray hose rated for at
least 3000 psi (210 bar) Maximum Working Pressure .
A used, under–rated hose could develop a high–
pressure leak or rupture.
4. Place the pump's suction tube in a pail of clean
water.
5. Be sure the gun trigger safety is locked.
6. Plug in the sprayer.
A
B
Fig. 21