Graco Inc 223660, PT2000, 218938, 307-730 manual Connecting Rod and Bearing See Fig, 15,16, 21,20

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-

QTY 2	17	15,16
PRESS
FIT INTO 22		LUBRICATE
30		TORQUE TO
		85 in–lb
A		(9.6 N.m)
		9
69		21,20
		GREASE
34
		BEARING
		HEAVILY

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.

42

43

33

Fig 16

22

18a18b 18

23

24 0300

39

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).

OUT

IN

MOTOR

LEADS

Fig 17 RED (+) 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).

307-730 15