Graco Inc 218938, PT2000, 307-730, 223660 manual

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.

2.Grease the inlet valve (3) to hold it in place. Install it in the valve housing (9). Screw the inlet valve hous- ing (1) into the pump housing. Have someone firmly hold the pump housing (9) and then torque the inlet valve to 470–490 in–lb (53–55 N.m).

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 55–65 in–lb (6.2–7.4 N.m). See Fig 13.
6.	Guide the pressure switch leads through the base.
	Connect a lead to the power-OUT side of the ON/
	OFF switch (34) and connect the other end to an un-
	marked terminal on the rectifier (39). See Fig 11.
7.	Reinstall the front cover.

CAUTION

1

9

12a

LUBRICATE

12

	10	TORQUE TO
		80–100 in–lb
		(13.5–16 N.m)
2f		2
	2e2d 2c 2b
		2a

TORQUE TO 280–300 in–lb

(32–34 N.m)

To avoid damaging the pressure switch, do not drop it or 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) and spring (2c).

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 and dry all parts.

6.Tip the pump back. Install a new seal (2f), making sure it lays flat.

7.Install the seat (2e) and torque it to 80–100 in–lb (13.5–16 N.m).

8.Drop in the ball (2d), making sure it stays there!

CAUTION

Do not let the ball drop into the pressure switch cav- ity (12). If that happens, and the outlet fitting (2a) is screwed into the pump, the switch will be perma- nently damaged.

9.Check the ball stop pin in the outlet fitting (2a) for wear or damage. 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, torquing to 280–300 in–lb (32–34 N.m).

Inlet Valve (See Fig 13.)

1.Unscrew the nut (45) on the suction hose (44). Screw the inlet valve housing (1) out of the pump housing

(9). Remove the inlet valve (3).

14

TORQUE TO 55–65 in–lb (6.2–7.4 N.m)

Fig 12 0296

44

45

1
TORQUE TO
470–490 in–lb
(53–55 N.m)	3

9

23

24

Fig 13 0787

307-730 13