17
307-863
Pressure Control Calibration
WARNING
USE EXTREME CAUTION WHEN PERFORMING THIS CALIBRATION PROCEDURE to reduce the risk of a
fluid injection injury or other serious bodily injury, which can result from component rupture, electric shock, fire,
explosion or moving parts.
This procedure sets the sprayer to 2600–3000 psi
(182–210 bar) MAXIMUM WORKING PRESSURE.
Perform this procedure whenever the pressure con-
trol 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
explosion. It may also prevent the sprayer from ob-
taining 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.
NEVER EXCEED 3000 PSI (210 BAR) MAXIMUM
WORKING PRESSURE. Normal operation of the
sprayer at higher pressures could result in compo-
nent 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 pro-
cedure. A used, under–rated hose could develop a
high pressure leak or rupture.
Service Tools Needed:
0–5000 psi (0–350 bar) fluid–filled pressure gauge (A),
Part No. 102–814
Swivel (B), Part No. 156–823
Tee (C), Part No. 104–984
Nipple (D), Part No. 162–453
NEW 50 foot (15.2 m), 3000 psi (210 bar),
flexible nylon airless spray hose (E), Part No. 223–541
NEW spray tip, size 0.025 to 0.029
3/8 in. ignition wrench or nut driver
5 gallon pail of water or mineral spirits
Fig. 8
01201
A
B
C
D
E
Set Up
1.
Follow the Pressure Relief Procedure Warning
on page 2.
2.
Set up the system as shown in Fig. 8.
Set the Dead Band (Pressure Differential)
NOTE: Do not alter this adjustment if the wheel is al-
ready set as shown in Fig. 9.
1.
Remove the pressure control cover.
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 A is the first letter
seen. See Fig. 9.
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 the
pump packings before proceeding. See page 18.
Adjust the Pressure
See Fig. 10
1.
Remove the plug (320) in the bottom of the pres-
sure control.
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 presure control.
a.
Loosen the nut just until you hear a click. Stop.
b.
Slowly tighten the nut just until another click is
heard. Stop.
4.
Replace the plug (320) and pressure control cover.
Inside pressure control looking up
at bottom of differential wheel
Fig. 9
A
01202
Fig. 10
A
B
C
320
0148
