Graco Inc. Series E - Manual (Page 11)

11
307–760
REPAIR
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 6.2–7.4 N.m (55–65 in–lb). See Fig 12.
6. Guide the pressure switch leads through the base.
Connect a lead to the power–out side of the ON/OFF
switch (34) and a lead to an unmarked terminal on
the rectifier (39). See Fig 11.
7. Reinstall the front cover (23).
CAUTION
To avoid damaging the pressure switch, do not drop
it, and do not 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).
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 all parts and dry.
6. Tip the pump back. Install a new seal (2f), making
sure it lays flat.
7. Install the seat (2e) and torque it to 13.5–16 N.m
(120–140 in–lb).
8. Drop in the ball, making very sure it stays there!
CAUTION
Do not drop the ball into the pressure switch cavity
(12). If it does, and the outlet fitting (2a) is then in-
stalled, the switch will be permanently damaged.
9. Check the ball stop pin in the outlet fitting (2a) for
wear, and 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, and torque to 32–34 N.m (280–300 in–lb).
Inlet Valve (See Fig 13)
1. Unscrew the suction hose (44). Unscrew the inlet
valve (3). Remove the gasket (4) and replace it if it
is worn.
2. Screw the new valve into the pump housing, torquing
to 27–29 N.m (240–260 in–lb).
NOTE: To torque the inlet valve, have someone firmly
hold the pump housing (9).
2f
Fig 12
Fig 13
10
2e
2d
2c
2b
2a
2
3
9
12a
12
14
TORQUE TO
13.5– 16 N.m
(120–140 in-lb.)
TORQUE TO
32–34 N.m
(280–300 in-lb.)
TORQUE TO
6.2–7.4 N.m
(55–65 in-lb.)
44
9
23
4
3
TORQUE TO
27–29 N.m
(240–260 in-lb.)