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).
17 | 15 |
| |
PRESS FIT | 16 |
INTO 22 |
|
30 |
|
| 9 |
69 | 21 |
| |
34 | 20 |
| 18a |
| 18b |
GREASE
BEARING
THOROUGHLY
43 | 23 |
| |
33 | 22 |
| 42 |
Fig 16
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
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.
307±760 13
