20
REPLACEMENT OF 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".
PRESSURE CALIBRATION ON THE ELECTRICAL
CON TROL BOARD
Engine Magneto Lead
To Sensor
FIG. 13
1. Turn "Pressure Calibration" Trimpot adjustment on
elec tri cal control board in the counter clockwise direc-
tion 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. Start engine and run at maximum RPM. Turn Prime/
Pressure Relief Valve to the open (Prime) position. 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 (Pressure) 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.
301-264
Hi Boy Fig 22 Item 37
Lo Boy Fig 23 Item 27
