AIRLESSCO 24F572, Operation And Repair Manual

Page: 18 / 36

Maintenance
18 3A1184A
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 150 psi, adjust the
phase limit trimpot so that the deadband is less than
150 psi and the pressure increase after the gun trig-
ger is released is less than 250 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 eight screws and lower the pressure con-
trol assembly.
3. Disconnect all leads from pressure control assem-
bly.
4. Reassemble in reverse order.
Sensor
1. Remove the screws and lower the pressure control
assembly.
2. Disconnect sensor lead from the board.
3. Unscrew sensor from pressure control assembly
using a 7/8” wrench.
4. Reassemble in reverse order. Use PTFE tape on the
sensor threads prior to reinstalling it into the pres-
sure control assembly.
Potentiometer
1. Lower pressure control assembly as described
above.
2. Disconnect potentiometer lead from pressure con-
trol assembly.
3. Use a 1/16” allen wrench, loosen set screw in the
poteniometer knob and remove knob and spacer.
4. Using a 1/2” wrench or deep socket, remove the nut
from the potentiometer shaft assembly.
5. Pull entire potentiometer assembly out of the frame.
6. Replace in reverse order.
On-Off Toggle Switch
1. Lower the pressure control assembly as described
above.
2. Disconnect the two wires on the toggle switch.
3. Use a 9/16” wrench to loosen the nut on the toggle
switch shaft.
4. Reassemble in reverse order.
Circuit Breaker
1. Lower pressure control assembly as described
above.
2. Disconnect the two wires on the holder.
3. Unscrew rubber boot from breaker shaft.
4. Use a 1/2” wrench to remove the bushing from the
breaker shaft.
5. Remove breaker from frame.
Always unplug the electrical cord before servicing the
machine.