Servicing Flow Control - Graco ProMix 2KS Repair Manual

Servicing Flow Control

Preparation
1. Follow Before Servicing, page 40.
2. Disconnect all air and fluid lines from the flow con-
trol regulator.
3. Disconnect the flow control cable from connector
(624). F . 37.
IG
4. Remove the four screws (605) holding the air plate
(607) to the housing (611). Carefully lift the plate off
the housing and disconnect the three cables from
J1, J2, and J4 on the circuit board (618). F
Servicing the Regulator and Pressure
Sensor
Regulator Service Kit 15G843 is available. Kit parts are
marked with an asterisk, for example (602*). For best
results, use all parts in the kit.
Sensor Service Kit 15G867 is available to service the
pressure sensor only. Kit parts are marked with a sym-
bol, for example (602‡). For best results, use all parts in
the kit.
1. Follow Preparation, above.
2. Remove the four screws (605) and the nut (601)
from the underside of the air plate (607). Separate
the air plate and fluid plate.
3. Unscrew the pressure sensor (620) from the fluid
plate (606).
NOTE: If you are only replacing the pressure sensor
kit 15G867, skip to step 6.
4. Remove the plug (615) and o-ring (604) from the top
of the fluid plate (606). Remove the parts of the dia-
phragm assembly (613, 610, 609, 612, 617, 616).
Remove and discard the dowels (623).
5. Reassemble the diaphragm assembly using the
new parts from the kit. Be sure the AIR SIDE of the
diaphragm (617) faces down. Torque the nut (601)
to 8-10 in-lb (0.9-1.1 N•m).
312780K
6. Install a new o-ring (602) on the pressure sensor
(620) and screw the sensor into the fluid plate (606).
7. Reinstall the fluid plate on the air plate. Be careful
not to pinch the pressure sensor cable. Torque the
screws (605) to 30-40 in-lb (3.4-4.5 N•m).
8. Reconnect the three cables to J1, J2, and J4 on the
circuit board (618). F
9. Reattach the air plate (607) to the housing (611).
Torque the screws (605) to 30-40 in-lb (3.4-4.5
N•m).
10. Reattach the flow control cable and all air and fluid
lines.
Servicing the Flow Control Board
1. Follow Before Servicing, page 40.
. 36.
IG
2. Remove the four screws (605) holding the bracket
(614) to the housing (611). F
3. Carefully separate the bracket from the housing and
disconnect the three cables from J1, J2, and J4 on
the circuit board (618). F
4. Remove the screws (621). Replace the old board
with the new board.
5. Reconnect the three cables to J1, J2, and J4 on the
circuit board (618). F
6. Reattach the bracket (614) to the housing (611).
Torque the screws (605) to 30-40 in-lb (3.4-4.5
N•m).
. 36.
IG
. 37.
IG
. 36.
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. 36.
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Service
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