Pressure Control Adjustment - Graco GM 5000 Instructions And Parts List

Pressure Control Adjustment

USE EXTREME CAUTION WHEN PERFORMING THIS CALIBRATION PROCEDURE to reduce the risk of a
fluid injection injury or other serious injury, which can result from component rupture, electric shock, fire, explo-
sion or moving parts.
This procedure sets the sprayer to 2600–3000 psi
(182–210 bar) MAXIMUM WORKING PRESSURE.
This procedure must be performed when the pressure
control assembly is removed and reinstalled, or re-
placed, to be sure the sprayer is properly calibrated.
Improper calibration can cause the sprayer to over–
pressurize and result in component rupture, fire or ex-
plosion. It may also prevent the sprayer from obtaining
the maximum working pressure, resulting in poor
sprayer performance.
NEVER attempt to increase the fluid outlet pressure by
performing these calibrations in any other way.
Service Tools Needed
NEW 50 foot (15.2 m), 3000 psi (210 bar), flexible nylon,
airless spray hose, p/n 223–541
0–5000 psi (0–350 bar) fluid–filled pressure gauge, p/n
102–814
NEW spray tip, size 0.025 to 0.029
3/8 in. ignition wrench or nut driver
5 gallon pail and water or mineral spirits
Swivel, p/n 156–823
Nipple, p/n 162–453
Tee, p/n 104–984
Set Up
1. Follow the Pressure Relief Procedure Warning on
page 14.
2. Set up the system as shown in Fig. 23.
Set the Dead Band (Pressure Differential)
NOTE: Do not alter this adjustment if the wheel is al-
ready set as shown in Fig. 24.
1. Remove the pressure control cover.
2. Set the white differential wheel (A) on the micros-
witch. Turn the wheel so the letter F is concealed be-
hind the switch and the letter A is the first letter seen.
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, replace
pump packings before proceeding. See page 31.
Adjust the Pressure
1. Remove the pressure control plug (326).
2. Turn and hold the pressure control knob (B) at the
maximum pressure setting.
3. Engage the nut (C): insert the nut driver through the
pressure control hole, or use the ignition wrench from
the front of the pressure control.
a. Loosen the nut just until you hear a click. STOP.
WARNING
See Fig. 25.
NEVER EXCEED 3000 psi (210 bar) MAXIMUM
WORKING PRESSURE. Normal operation of the
sprayer at higher pressures could result in component
rupture, fire or explosion.
ALWAYS use a new 50 foot (15.2 m) spray hose, rated
for at least 3000 psi (210 bar) MAXIMUM WORKING
PRESSURE, when performing this procedure. A used,
under–rated hose could develop a high pressure leak
or rupture.
AVOID touching the wires in the pressure control as-
sembly when the control box cover is removed, to re-
duce the risk of electric shock.
b. Slowly tighten the nut just until another click is
heard. STOP.
4. Replace the plug (326) and pressure control cover.
Fig. 23
Fig. 24
A
h
Fig. 25
Connect to
102–814
fluid outlet
156–823
104–984
162–453
223–541
A
B
C
326 0151
0474
0475