Graco EM 490 Instructions-Parts List Manual page 17

WARNING
To reduce the risk of serious bodily injury, including
fluid injection; splashing in the eyes; injury from
moving parts or electric shock, always follow the
Pressure Relief Procedure W arning on page 11
before continuing.
CAUTION
Use extreme caution when removing the elbow
(309) or nipple (103) from the pressure control. Any
twisting or jarring of the pressure control fittings
could alter the factory setting of the control or per-
manently damage the control.
NOTE: Refer to Fig 20 except where noted otherwise.
NOTE: If you purchased a bare pressure control, remove
items 302 to 322 as listed on page 24, and item
103 from the old box and install them on the new
one.
1 Remove the nut (122) and washer (123). Hold the nut
(A) at the pressure control with a wrench and unscrew
the swivel union (84) from the pressure control. Re-
move the filter assembly (47).
2 Disconnect the hose (52) from the pressure control.
3 Remove the screws (135) and cover (41) from the
pressure control (50).
4 Disconnect the motor leads. See Fig 21.
5 Loosen the knurled part of the strain relief bushing
(306) and unscrew it from the pressure control. Slide
the strain relief bushing up on the power cord to pro-
vide clearance and unscrew the conduit connector
(305). See Fig 20.
6 Remove the screws (7), lockwashers (4) and nuts (3).
Pull the pressure control away from the frame, care-
fully guiding the motor leads through the connector
(305).
7 Remove the mounting bracket (40) and screws (25)
and install them on the new pressure control.
8 Reasemble the pressure control in the reverse order
of disassembly.
CAUTION
Failure to observe the following may cause poor
performance or excessive pressure and perma-
nent damage to the pressure control:
1. Always use nylon spray hose at 15.2 m (50 ft)
minimum length.
2. Never use a wire braid spray hose.
3. Never attach a spray hose to the pressure
drain valve.
4. Never add any type of shutoff device between
the pump outlet and the spray gun.
5. Never allow flushing water or water base paint
to freeze in the system.
PRESSURE CONTROL
VOLTAGE CHANGE
BOX LOCATED ON
THIS SIDE OF MOTOR
3
4
122
123
Fig 7–20
ON/OFF
SWITCH
MICROSWITCH
Fig 7–21
25
40
7
50
305
HIDDEN
FROM
VIEW
306
135
41
A
103
309
52
84
47
0121
POWER
CORD
MOTOR LEADS
GRN/YEL
BLUE
BROWN
ATTACH TO
GROUNDING SCREW (302)
0131