21
Electrical Control Board Replacement
Pressure Calibration on the Electrical Control Board
1.
Remove electrical cover.
2.
Disconnect sensor lead from Electrical Board.
3.
Disconnect two clutch leads on Electrical Board
from leads on clutch.
4.
Using a 1/16" allen, loosen set screw in Pressure
Con trol Knob and remove knob.
5.
Using a 1/2" nutdriver or 1/2" deep socket, remove
nut from pressure control shaft. This will allow
removal of elec tri cal con trol board from frame.
6.
Replace Electrical Board Assembly in reverse order.
Adjust pressure as per procedure below, "Pressure
Cal i bra tion on the Electrical Control Board".
1.
Turn "Pressure Calibration" Trimpot adjustment on
elec tri cal control board in the counter clockwise
direction at least 15 revolutions.
2.
Connect 5000 psi glycerine pressure guage on output
of pump between fl uid pump & airless hose to
monitor Fluid Pump Pres sure.
3.
Turn Prime/Pressure Relief Valve to the open
(Prime) position. Start engine and run at maximum
RPM. Turn Pres sure Con trol Knob to maximum
position (fully clock wise).
4.
Using an insulated screwdriver, adjust "Pressure
Cal i bra tion" Trimpot by turn ing clock wise until the
clutch en gag es. When the clutch en gag es the pump
will com mence Prim ing. When pump is primed, turn
the Prime/Pressure Relief Valve to the Closed (Pres
sure) Position
5.
Trigger gun. The pressure should drop approximately
350-400 psi (when using a 3/8" hose), the clutch will
en gage and build pres sure to 3000 psi and disengage.
Trig ger gun several times to en sure proper pressure
set ting.
6.
Turn Pressure Control Knob to minimum position. The
clutch should disengage and pump stop moving.
7.
Secure leads with tie strap.
8.
Replace cover on unit. Ensure the leads are not
pinched or damaged in the process of replacing covers.
The pump will begin to pressurize and the clutch will dis-
en gage at a low pressure. Continue turning the Trimpot
clockwise to increase pressure to 3000 psi.
