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Pressure Control Repair
28 309674M
Pressure Control Transducer
Removal
1. Relieve pressure, page 7.
2. Remove screws (12) and cover (50).
3. Disconnect transducer lead from motor control
board (49).
4. Slide transducer grommet (20) out of control box
(48).
5. Remove pressure control transducer (38) and o-ring
(3) from filter housing.
Installation
1. Install o-ring (3) and pressure transducer (38) in fil-
ter housing (15). Torque to 30-35 ft-lb.
2. Thread transducer lead plastic connector through
transducer grommet (20) and slide grommet into
slot in control box housing (48).
3. Install filter housing (15) with screws (47).
4. Connect transducer lead (J7 or J11) to motor control
board (49).
5. Install cover (50) with screws (12).
Pressure Adjust Potentiometer
Removal
1. Relieve pressure, page 7.
2. Remove screws (12) from cover (50).
3. Disconnect potentiometer lead from motor control
board (49).
4. Remove potentiometer knob (11), nut (37a) and
pressure adjust potentiometer (37).
Installation
1. Install pressure adjust potentiometer (37) and nut (37a).
a. Turn potentiometer fully clockwise.
b. Install knob (11) at full clockwise position.
2. Connect potentiometer lead (J8 or J12) to motor
control board (49). See wiring diagram pages 22,
23, and 24 for your sprayer model.
3. Install cover (50) with screws (12).
SmartControl
The SmartControl contains stored data to assist with
troubleshooting and maintenance. To view this stored
data on the digital display:
1. Relieve pressure, page 7.
2. Plug in sprayer.
3. Hold down display button and turn sprayer ON.
4. Release display button about 1 second after turning
on sprayer.
Sprayer model number displays (U395/U495) for a
few seconds and then data point 1 is displayed.
5. Push display button and next data point displays.
6. Turn sprayer OFF and then ON to exit stored data mode.
Data Point Definition
1 • Number of hours power switch has been ON with power applied. (Ultra, Ultimate Nova,
Super Nova and ST Max 395/495/595 only.)
• Serial Number of sprayer. (UltraMax II, Ultimate Max II and ST Max II 490/495/595 only.)
2 Number of hours motor has been running.
3 Last error code. Press and hold display button to clear error code to E=00
4 Software revision