24
25
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
Control 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 electrical control board from frame.
6. Replace Electrical Board Assembly in reverse order.
Adjust pressure as per procedure below, "Pressure Cal-
ibration on the Electrical Control Board".
PRESSURE CALIBRATION ON THE ELECTRICAL
CONTROL BOARD
Engine Magneto Lead
Control
Board
301-282-99
To Sensor
331-294-99
Pressure
Calibration
Trimpot
Set Screw
Knob
301-513A
FIG. 25
Engine
Frame
BLUE
BLACK
BLACK
GREEN
BLACK
Grommet
117-045
BLACK
BLACK
1. Turn "Pressure Calibration" Trimpot adjustment on
electrical control board in the counter clockwise direc-
tion at least 15 revolutions.
2. Connect 5000 psi glycerine pressure guage on outlet
of pump between fluid pump & airless hose to monitor
Fluid Pump Pressure.
3. Start engine and run at maximum RPM. Turn Prime
Valve to the open (Prime) position. Turn Pressure Control
Knob to maximum position (fully clockwise).
4. Using an insulated screwdriver, adjust "Pressure
Calibration" Trimpot by turning clockwise until the clutch
engages. When the clutch engages the pump will com-
mence Priming. When pump is primed, turn the Prime
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
engage and build pressure to 3000 psi and disengage.
Trigger gun several times to ensure proper pressure
setting.
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-
engage at a low pressure. Continue turning the Trimpot
clockwise to increase pressure to 3000 psi.
Clutch
301-264
O-Ring