Graco Inc. Series E - Manual (Page 13)

13
307–760
REPAIR
Connecting Rod and Bearing (See Fig 16)
1. Remove the front cover plate (23). Remove the
screws (15) and tip the pump housing (9) out of the
way. Unscrew the diaphragm (17) and discard.
CAUTION
Replace the diaphragm (17) whenever you remove
the pump housing (9). During use, small grooves are
formed in the diaphragm which cannot be realigned
properly. Reusing a diaphragm may cause leaking
which will result in costly damage to the pump.
2. Remove the motor screws (20). Lift the motor (30)
slightly. Holding the connecting rod, pull the motor
away from the housing (22).
3. Inspect the bearing (18b) in the connecting rod (18).
If it is worn or any rollers are broken, replace the
bearing and rod assembly (18). Inspect the motor ec-
centric (F), and replace the motor if the eccentric is
worn.
4. Use your fingers to pack high–quality bearing grease
thoroughly in between the bearing rollers.
CAUTION
Thorough greasing of the bearing is essential to ex
tend the life of the bearing and the motor eccentric.
5. Use a soft brass or nylon bristle brush to clean the top
of the connecting rod and housing. Gently clean the
bottom of the pump housing (9), avoiding damage to
the diaphragm grooves.
6. Install the connecting rod (18) in the connecting rod
housing (22). Screw a new diaphragm (17) into the
rod just until it bottoms. Turn the diaphragm
only1/4
to 1/2 turn more (2.7–3.6 N.m [6–8 in–lb]).
7. Align the motor with the pins in the connecting rod
housing (22), guiding the motor eccentric through the
connecting rod bearing (18b). Spin the motor shaft to
be sure it moves freely.
8. Loosely install the lockwashers (21) and screws (20).
Spin the motor shaft again. Now alternately tighten
the screws. Spin the motor shaft again.
CAUTION
Spinning the motor shaft while assembling the
pump ensures that parts are properly aligned. If they
are not, and you start the pump, serious damage
could result to the motor, bearing, and connecting
rod. If you feel binding or resistance, disassemble
the parts, checking the spin often, until you deter-
mine the cause of the binding.
9. Position the pump housing (9) on the sprayer. Lubri-
cate the screws (15) and install them and the Iock-
washers (16) loosely. Torque the screws a few inch–
pounds (N.m) at a time, oppositely and evenly, to 85
in–lb (9.8 N.m).
10. Reinstall the front cover plate (23).
30
Fig 16
9
21
20
18a
18b
23
22
42
43
33
34
69
17
15
16
PRESS FIT
INTO 22
GREASE
BEARING
THOROUGHLY
Motor (See Fig 16)
1. Remove the front cover plate (23).
2. Remove the bumpers (43) and the bottom cover
plate (42). Disconnect the motor leads from the posi-
tive and negative rectifier terminals. See Fig 11, page
12.
3. Remove the motor screws. Lift the motor (31)) slight-
ly. Holding the connecting rod, pull the motor away
from the housing (22).
4. Inspect the bearing (18b) in the connecting rod (18).
If it is worn or any rollers are broken, replace the
bearing and rod assembly (18) as instructed to the
left.
5. Use your fingers to pack high-quality bearing grease
thoroughly in between the bearing rollers.
6. Feed the motor leads through the rubber grommet
(69). Align the motor with the pins in the connecting
rod housing (22), guiding the motor eccentric
through the connecting rod bearing (18b). Spin the
motor shaft to be sure it moves freely.
7. Loosely install the lockwashers (21) and screws (20).
Spin the motor shaft again. Alternately tighten the
screws. Spin the motor shaft again. See the CAU-
TION in Step 8 to the left.
8. Connect the red motor lead to the positive (+) termi-
nal and the black motor lead to the negative (–) termi-
nal of the rectifier (39). Refer to Fig 11.
9. Reinstall the front cover plate.