Graco Inc 307760, Series E Pressure Switch See , 12, Outlet Valve See Fig, Inlet Valve See Fig

REPAIR

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.

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 6.2±7.4 N.m (55±65 in±lb). See Fig 12.

6.Guide the pressure switch leads through the base. Connect a lead to the power±out side of the ON/OFF switch (34) and a lead to an unmarked terminal on the rectifier (39). See Fig 11.

7.Reinstall the front cover (23).

CAUTION

To avoid damaging the pressure switch, do not drop it, and do not 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).

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 all parts and dry.

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

7.Install the seat (2e) and torque it to 13.5±16 N.m (120±140 in±lb).

8.Drop in the ball, making very sure it stays there!

CAUTION

Do not drop the ball into the pressure switch cavity (12). If it does, and the outlet fitting (2a) is then in- stalled, the switch will be permanently damaged.

9.Check the ball stop pin in the outlet fitting (2a) for wear, and 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, and torque to 32±34 N.m (280±300 in±lb).

Inlet Valve (See Fig 13)

1.Unscrew the suction hose (44). Unscrew the inlet valve (3). Remove the gasket (4) and replace it if it is worn.

2.Screw the new valve into the pump housing, torquing to 27±29 N.m (240±260 in±lb).

NOTE: To torque the inlet valve, have someone firmly hold the pump housing (9).

3

	10
	2
	2f
	2e
	2d
9	2c
	2b
	2a
12a
12	TORQUE TO
	13.5± 16 N.m
	(120±140 in-lb.)
14
TORQUE TO	TORQUE TO
6.2±7.4 N.m	32±34 N.m
(55±65 in-lb.)	(280±300 in-lb.)

Fig 12

44

3

TORQUE TO 27±29 N.m (240±260 in-lb.)

4

9

23

Fig 13

307±760 11