18
308–030
PRESSURE CONTROL & CIRCUIT BOARD
To reduce the risk of serious bodily injury, al-
ways follow the Pressure Relief Procedure
Warning on page 14 before checking or re-
pairing any part of the spray system.
WARNING
NOTE: Refer to Fig 15 and 16.
NOTE: A circuit board (13b) is not included with
the new pressure control (18). Order sep-
arately, if needed.
Do not allow the fittings (A) to move when
removing the elbow (90) or the tee (89) from
the pressure control to avoid altering the fac-
tory setting of the pressure control or perma-
nently damage the pressure control.
CAUTION
Circuit Board Removal
1. Remove the pressure control cover (7). Pull
the board (13b) out carefully, just far enough
to reach the wire terminals. Disconnect the
leads and remove the board.
Pressure Control Removal
2. Disconnect the main spray hose from the filter,
the drain hose (41) from the pressure drain
valve (35), and disconnect the hose (26) from
the pressure control. Unscrew the tee (89).
3. Disconnect the remaining motor leads.
4. Remove the screws (88), spacers (11), lock-
washers (39), nuts (40).
5. Pull the pressure control (18) away from the
conduit (13f) while carefully guiding the leads
through the bushing (91), one at a time.
6. Remove the mounting bracket (70) and install
it on the new pressure control.
7. Guide the motor leads into the new pressure
control.
Circuit Board Installation
8. Position the circuit board at the control so the
wire connectors are at the top. Connect the
leads to the board. Guide the leads into the
pressure control, making sure they don’t catch
on anything. Slide the board into place.
Pressure Control Installation
9. Connect any other loose wires. See Fig 16.
10. Mount the pressure control on the cart. Install
the lift handle.
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 overpressuriza-
tion which can result in component rupture,
fire or explosion. Improper adjustment may
also prevent the sprayer from obtaining the
maximum working pressure, resulting in poor
sprayer performance.
WARNING
Fig 15
26
7
41
89
88
11
16
70
40
39
90
A
35
18
Fig 16
BLACK
GREEN &
YELLOW
RED
PINK
BROWN
WHITE
BLACK
GREEN
POWER SUPPLY
CORD LEADS
MOTOR
LEADS
91
7
306
13f
16
70
A
90
13b
Summary of Contents for PRO 301
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