Pressure Control - Graco GMax 233700 Instruction & Repair Manual

Removal
1.
Relieve pressure; page 5.
2. Fig. 14. Remove four screws (28) and
display/cover (153). Pull display connector wings
open on PC board and pull display connector out.
3. Fig. 21. Disconnect at control board (10):
D Lead (D) from potentiometer.
D Lead (E) from transducer.
D Remove ON/OFF switch (47) connector (A).
4. Fig. 14. Remove six screws (144) from control board
(10) and green ground wire.
5. Remove connector (Y) at backside of pressure
control. Remove jam nut (Z) and control board
(10).
Removal
1.
Relieve pressure; page 5.
2. Fig. 14. Remove four screws (28) and
display/cover (153).
3. Disconnect lead (E) from control board (10).
4. Remove two screws (133) and transducer guard
(149) from control housing (55). Pull transducer
connector through rubber grommet (147).
Removal
1.
Relieve pressure; page 5.
2. Fig. 14. Remove four screws (28) and
display/cover (153).
3. Disconnect lead (D) from control board (10).
4. Loosen set screws on potentiometer knob (45) and
remove knob, shaft nut, lockwasher (85) and
pressure adjust potentiometer (85).
5. Remove seal (78) from potentiometer (85).

Pressure Control

Control Board
Installation
When installing replacement control board, follow
instructions with control board to set model type.
1. Fig. 14. Install control board (10) and jam nut (Z).
2. Install green ground wire and control board (10)
3. Fig. 21. Connect to control board (10):
4. Fig. 14. Push display connector into PC board
Pressure Control Transducer
5. Remove pressure control transducer (100q) and
1. Fig. 14. Install o-ring (100p) and pressure control
2. Install transducer connector and rubber grommet
3. Connect lead (E) to motor control board (10).
4. Install display/cover (153) with four screws (28).
Pressure Adjust Potentiometer
Installation
1. Install seal (78) on potentiometer (85).
2. Fig. 14. Install pressure adjust potentiometer (85),
3. Connect lead (D) to control board (10).
4. Install display/cover (153) with four screws (28).
Install connector (Y) at backside of pressure
control.
with six screws (144).
D Connect ON/OFF switch (47) connector (A).
D Lead (E) to transducer.
D Lead (D) to potentiometer.
close display connector wings on PC board. Install
display/cover (153) with four screws (28).
o-ring (100p) from filter housing (100e).
Installation
transducer (100q) in filter housing (100e). Torque
to 30–36 ft-lb.
(147) in control housing (55) . Install transducer
guard (149) on control housing with two screws
(133).
shaft nut, lockwasher (85) and potentiometer knob
(45).
a. Turn potentiometer shaft (85) clockwise to
internal stop. Assemble potentiometer knob
(45) to strike pin on plate (15).
b. After adjustment of step a., tighten both set
screws in knob 1/4 to 3/8 turn after contact
with shaft.
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