18
PRESSURE CONTROL AND CIRCUIT BOARD
WARNING
To reduce the risk of serious bodily injury, including
fluid injection; splashing in the eyes or on the skin;
injury from moving parts or electric shock, always
follow the Pressure Relief Procedure Warning
on page 12 before continuing.
NOTE: A circuit board (81) is not included with a new
pressure control (74). However, it is included
with a new motor and it can be ordered separate-
ly.
Be sure to order the correct circuit board. See
the application information on page 22.
Do not allow the fittings (A) to move when removing
the elbow (93) or tee (94) from the pressure con-
trol, to avoid altering the factory setting of the pres-
sure control or damaging the pressure control.
CAUTION
Circuit Board Removal
1.
Remove the pressure control cover (79). Pull the cir-
cuit board (81) out carefully, just enough to reach the
wire terminals. Disconnect the leads. Remove the
board. See Fig 10.
Pressure Control Removal
2.
Disconnect the hose (20). See Fig 9.
3.
Disconnect the remaining two motor leads (black
and green/yellow). See Fig 10.
4.
Remove the mounting screws (8). See Fig 9
.
5.
Pull the pressure control (74) away from the conduit
(76) and carefully guide the leads through the con-
nector (75) one at a time. See Fig 10.
6.
Remove the mounting bracket (77). Remove the fit-
tings (93,94). Install these parts on the new pressure
control.
See Fig 9.
Pressure Control Installation
7.
Guide the motor leads into the new pressure control.
8.
Position the circuit board (81) in the pressure control
so the wire connectors are at the top. Connect the
leads to the board as shown in Fig 10. Guide the
leads into the pressure control, making sure they
don’t catch on anything. Slide the board into place.
9.
Connect any other loose wires. See Fig 10.
10. Mount the pressure control on the cart.
11. ADJUST THE PRESSURE CONTROL! See page
19.
Adjust the pressure control whenever a new or
used pressure control or circuit board is installed,
to reduce the risk of overpressurization which can
result in component rupture, fire or explosion. Im-
proper adjustment may also prevent the sprayer
from obtaining the maximum working pressure, re-
sulting in poor sprayer performance.
WARNING
Fig 9
Fig 10
93
20
74
18
9
8
94
RED
BLACK
BROWN
WHITE
GREEN
76
75
75
79
PINK
BLACK
POWER
SUPPLY
LEADS
GREEN & YELLOW
MOTOR
LEADS
WHITE
RED
WHITE
TRIAC
LEADS
1
74
81
A
77
