PRESSURE CONTROL ADJUSTMENT
WARNING
USE EXTREME CAUTION WHEN PERFORMING THIS ADJUSTMENT 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 2750 psi (190 bar)
MAXIMUM WORKING PRESSURE.
Perform this procedure whenever the microswitch or pressure control assembly is reinstalled or replaced, to be sure the sprayer is properly calibrated.
Improper adjustment 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 adjustments in any other way. Normal operation of the sprayer at higher pressures could result in component rupture, fire or explosion. To perform this adjustment, however, the sprayer pres- sure must be temporarily increased above the normal working pressure.
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 pres- sure leak or rupture.
Service Tools Needed:
DNEW 50 foot (15.2 m), 3000 psi (231 bar). flexible ny- lon, airless spray hose, Part No. 223±541
D0±5000 psi (0±350 bar) fluid±filled pressure gauge, Part No. 102±814
DNeedle valve, Part No. 102±715 or 103±067
D3/8 in. socket wrench
D5 gallon pail and water
DMineral spirits
1.Follow the Pressure Relief Procedure Warning on page 14.
2.Connect the new 50 ft (15.2 m) spray hose to the sprayer outlet. Install the needle valve on the other end of the hose. Install the fluid±filled pressure gauge in the top port of the fluid filter.
3.Remove the pressure control cover (41) and the plug
(135)(see the parts drawings) from the bottom of the pressure control. In Step 6, you will insert the 3/8 in. socket wrench through the plug hole (C) to engage the pressure adjustment nut (B) which is located on the bottom of the pressure control knob shaft.
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