15
307-730
Connecting Rod and Bearing
(See Fig 16
.)
1. Remove the front cover (23). Remove the screws
(15). Carefully tip back the pump housing. Unscrew
the diaphragm (17) and discard it.
CAUTION
Replace the diaphragm whenever you remove the
pump housing (9), or after each 100 hours of use,
whichever comes first. During use, small grooves
are formed in the diaphragm which cannot be re-
aligned properly. Reusing a diaphragm may cause
leaking, resulting in costly pump damage.
2. Remove the motor screws (20). Lift the motor (30)
slightly. Holding the connecting rod (18a), pull the
motor away from the housing (22).
3. Inspect the bearing (18b) in the connecting rod (18a).
If it is worn or any rollers are broken, replace the con-
necting rod assembly (18). Inspect the motor eccen-
tric, 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
Thoroughly grease the bearing to extend 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. Taking care not
to damage the diaphragm grooves, gently clean the
bottom of the pump housing (9).
6. Install the connecting rod assembly (18) in its hous-
ing (22). Screw a new diaphragm (17) into the rod just
until it bottoms. T urn the diaphragm another 1/8 to
1/4 turn [about 4–6 in–lb (0.4–0.7 N.m)].
CAUTION
Never turn the diaphragm more than 1/4 turn when
torquing it, as that will prevent the diaphragm from
working properly.
7. Align the motor with the pins in the connecting rod
housing (22). Guide the motor shaft (A) 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)
to hold the motor. Spin the motor shaft again. Alter-
nately 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 and correct the cause of the binding.
9. Position the pump housing (9) on the connecting rod
housing. Lubricate the screws (15) and loosely install
them and the lockwashers (16). Torque the screws
a few inch–pounds (N.m) at a time, oppositely and
evenly, to 85 in–lb (9.6 N.m).
10. Reinstall the front cover (23).
Fig 16
17
9
0300
LUBRICATE
TORQUE TO
85 in–lb
(9.6 N.m)
15,16
42
43
33
22
24
23
69
34
30
21,20
18a 18
18b
QTY 2
PRESS
FIT INTO 22
GREASE
BEARING
HEAVILY
A
Fig 17
39
IN
OUT
RED (+)
MOTOR
LEADS
0295
Motor
(See Fig 16 and 17.)
1. Remove the front cover (23).
2. Remove the base cover (42). Disconnect the motor
leads from the positive and negative rectifier termi-
nals. See Fig 17.
3. Remove the motor screws (20). Lift the motor (30)
slightly. Holding the connecting rod (18a), pull the
motor away from the housing (22).
4. Inspect the bearing (18b) in the connecting rod (18a).
If it is worn or any rollers are broken, replace the
bearing and connecting rod assembly (18) as in-
structed to the left.
5. Use your fingers to pack high quality bearing grease
thoroughly in between the bearing rollers. See the
CAUTION following Step 4, to the left.
6. Feed the motor leads through the rubber boot (69).
Align the motor with the pins in the connecting rod
housing (22). Guide the motor shaft (A) 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
CAUTION, following 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). See Fig 17.
9. Install the base cover (42) and bumpers (43), and the
front cover (23).
