PRESSURE CONTROL REPLACEMENT
WARNING
Before doing this procedure, follow the
Pressure
Relief
Procedure Warning
on page 21
to
reduce
the risk of a fluid injection injury, splashing in the
eyes or on the skin, injury from moving
parts, or
electric shock.
Refer
to
Fig
28
-
1.
1. Disconnect the main fluid hose (23) and the secon
-
dary fluid hose,
if
used, from the sprayer.
2. Disconnect the fluid hose
(47)
from between the dis
-
placement pumpoutlet nipple
(46)
andpressurecon-
trol inlet elbow
(78).
3.
Hold the hex of the pressure contwl adapter
(A)
firmly with a 19 mm open end wrench. Use a wrench
to
unscrew the nipple (123) and filter.
4.
Remove the pressure control cover and screws, and
disconnect the four motor leads at the appropriate
terminals.
5.
Refer to
CIRCUIT BOARD REPLACEMENT
on
page 26, remove the circuit board and retain.
6.
Remove the conduit (22).
7.
Use a 13 mm open end wrench to loosen and remove
the three pressure control mounting screws
(44)
and
lockwashers
(40)
and nuts (120) located below the
pressure control box. Remove the box.
-
8.
Install the new pressure control assembly in the re
-
verse order of disassembly.
9. Perform the
STALL PRESSURE CALIBRATION
starling on page
28,
before regular operation of the
sprayer.
CAUTION
the new pressure control assembly. Turning
it
can
Do not allow the adapter
(A)
to
turn while installing
damage the sensitive bourdon tube. Hold .the
adapter firmly with a 19
mm open end wrench while
screwing In the nipple (123).
Fig
28
-
1
307
-
670 27
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