Graco Inc. 223660 - Manual (Page 13)

13 307-730
Pressure Switch (See Fig 11, 12 & 13 .)
1. Disconnect the pressure switch leads from the ON/
OFF switch and from the rectifier. See Fig 11.
2. Remove the front cover (23). See Fig 13.
3. Unscrew the retainer (14) and remove the pressure
switch (12) and o-ring (12a). See Fig 12.
4. Grease and install a new o-ring (12a) in the pump
housing (9). See Fig 12.
5. Slide the retainer (14) over the pressure switch and
screw the retainer into the pump housing. Torque the
retainer to 55–65 in–lb (6.2–7.4 N.m). See Fig 13.
6. Guide the pressure switch leads through the base.
Connect a lead to the power-OUT side of the ON/
OFF switch (34) and connect the other end to an un-
marked terminal on the rectifier (39). See Fig 11.
7. Reinstall the front cover.
CAUTION
To avoid damaging the pressure switch, do not drop
it or press on the center of the switch.
Outlet Valve (See Fig 12.)
1. Remove the outlet hose (64). Unscrew the outlet fit-
ting (2a) and remove the gasket (2b) and spring (2c).
2. Tip the pump forward to remove the ball (2d).
3. Use a 1/4 in. square socket wrench extension to
screw out the seat (2e).
4. Use a pointed tool, such as a dentist’ s pick, to re-
move the seal (2f).
5. Thoroughly clean and dry all parts.
6. Tip the pump back. Install a new seal (2f), making
sure it lays flat.
7. Install the seat (2e) and torque it to 80–100 in–lb
(13.5–16 N.m).
8. Drop in the ball (2d), making sure it stays there!
CAUTION
Do not let the ball drop into the pressure switch cav-
ity (12). If that happens, and the outlet fitting (2a) is
screwed into the pump, the switch will be perma-
nently damaged.
9. Check the ball stop pin in the outlet fitting (2a) for
wear or damage. Replace the fitting, if necessary .
Place a new gasket (2b) around the fitting. The last
coil on one end of the spring (2c) is turned in. Place
this end on the ball stop pin. Screw the fitting into the
pump housing, torquing to 280–300 in–lb (32–34
N.m ).
Inlet Valve (See Fig 13.)
1. Unscrew the nut (45) on the suction hose (44). Screw
the inlet valve housing (1) out of the pump housing
(9). Remove the inlet valve (3).
2. Grease the inlet valve (3) to hold it in place. Install it
in the valve housing (9). Screw the inlet valve hous-
ing (1) into the pump housing. Have someone firmly
hold the pump housing (9) and then torque the inlet
valve to 470–490 in–lb (53–55 N.m).
Fig 12
1
2
2a
2b
2c
2d
2e
2f
9
10
12
14
TORQUE TO
80–100 in–lb
(13.5–16 N.m)
TORQUE TO
55–65 in–lb
(6.2–7.4 N.m)
TORQUE TO
280–300 in–lb
(32–34 N.m)
0296
12a
LUBRICATE
Fig 13
TORQUE TO
470–490 in–lb
(53–55 N.m)
1
44
9
23
24
45
3
0787