Maintenance
16
3A1185B
Pressure Calibration
1.
Complete the ZERO calibration, as per “ZERO CAL-
IBRATION” prior to commencing this calibration.
2.
Attach a 50’, 1/4” airless hose, airless gun with
0.017 tip and a 5000 psi glycerin filled pressure
gauge to pump.
3.
Place the suction tube into a bucket of Pump Condi-
tioner and water.
4.
Turn prime/pressure relief valve to the prime (open)
position.
5.
Turn pressure control knob clockwise until machine
starts to prime.
6.
Place the prime/pressure relief valve in the pressure
(closed) position.
7.
While watching pressure gauge, slowly adjust the
pressure trimpot (clockwise to increase and counter
clockwise to decrease) until the maximum static
pressure is 3000 psi, with the pressure control knob
fully clockwise. Trigger the gun several times to
ensure pressure returns to 3000 psi.
LCD Display Calibration
1.
Complete the “ZERO CALIBRATION” and “PRES-
SURE CALIBRATION” procedures prior to com-
mencing this calibration.
2.
Turn pressure control knob up until system pressure
is above 2500 psi (as indicated on the glycerin filled
pressure gauge) and the machine is not cycling.
3.
Use an insulated screwdriver to adjust the LCD Set
trimpot. Turn trimpot CCW until it clicks, then adjust
to match pressure against pressure gauge reading.
4.
Move the pressure control knob to different settings
and trigger the gun several times to ensure that the
LCD continues to match the pressure gauge read-
ing.
Phase Limit Calibration
Formerly known as the low voltage or master voltage
calibration.
1.
Attach a 50’, 1/4” airless hose, airless gun with .017
tip and a 5000 psi glycerin filled pressure gauge to
the pump.
2.
Place the suction tube into a bucket of Pump Condi-
tioner.
3.
Turn pump on and turn up pressure control until the
machine starts to prime.
4.
Place the prime/pressure relief valve in the pressure
(closed) position.
5.
Pressurize pump to 600 psi.
6.
Trigger the gun several times noting the deadband
(the amount of pressure drop before the pump
rebuilds to set pressure).
7.
If deadband is greater than 100 psi, adjust the
phase limit trimpot so that the deadband is less than
100 psi and the pressure increase after the gun trig-
ger is released is less than 200 psi. These pres-
sures are guidelines and may vary slightly from
pump to pump.
8.
Reattach pressure control assembly to unit.
Replacement of Electrical
Components
NOTE:
Anytime the pressure control assembly, sensor,
or both are replaced, perform the calibrations.
Pressure Control Assembly (Electrical
Control Board)
1.
Unplug machine’s power cord.
2.
Remove four screws heatsink housing.
3.
Disconnect all leads from pressure control assem-
bly.
4.
Reassemble in reverse order.
Always unplug the electrical cord before servicing the
machine.
