Graco 3000cc, 4000cc important safety instructions Inlet Seat with Pressure Relief Valve

Repair

8.Remove the wet-cup (34) and o-ring (52). Remove the TSL pump piston seal (36), spring (35), and o-rings (51).

9.Remove the throat cartridge (27). Remove the o-ring (52), glands (32, 33), packings (30, 31), and spring (28).

10.Remove the nuts (12), lockwashers (11), and six cylinder capscrews (10). Lift off the outlet valve housing (2).

11.Lift the riser tubes (6) and cylinder (4) off the inlet valve housing (7). The piston assembly may stay in the cylinder. Remove the seals (3 and 5) from the inlet and outlet housings (2, 7). See FIG. 5.

NOTE: Tap on the valve housings with a plastic mallet and use a slight rocking motion to help loosen and remove the cylinder and tubes.

12.If Part No. 218742 accessory pump stand is used, unscrew and remove the three pump stand bolts. Lift the inlet valve assembly off the stand. Place the inlet valve housing (7) face down on a protected surface.

13.Use a 13 mm socket wrench to loosen and remove the twelve capscrews (9) and lockwashers (8) from the inlet manifold (1). See FIG. 5.

14.Lift the manifold (1) off the inlet valve housing (7) and remove the seats (13 and 14). Remove the o-ring (15) from the seats. Remove the balls (18), ball guides (16) and seals (17).

NOTICE

Be careful not to drop or damage the balls (18) or seats (13 or 14). A damaged ball or seat cannot seal properly and the pump will leak. One inlet valve seat

(13)can be reversed to provide longer use of the seat. However, the fluid inlet seat (14) contains a pressure relief valve and is not reversible. See FIG. 5 for proper orientation.

15.Inspect the pressure relief valve in the fluid inlet seat (14) to make sure it is not clogged. Press down on the valve's ball to see if the ball and spring are free to move. See FIG. 4.

ball

15
	spring
14	pressure relief valve

TI15631a

FIG. 4. Inlet Seat with Pressure Relief Valve

NOTICE

If the pressure relief valve in the inlet seat (14) is clogged or filled with material, soak the seat in a com- patible solvent. Make sure all material residue is cleaned from the ball and seat area.

If the relief valve cannot be thoroughly cleaned so that the ball and spring are free to move, replace the seat (14).

16.Push the piston assembly through the cylinder just enough to expose the piston (26) flats. Secure the piston flats in a vise. Use a plastic mallet to tap the cylinder (4) up and off the piston assembly.

17.Loosen the piston nut (21). Use Tool Kit 220385 (to remove the piston shaft (19) and piston nut (21). Remove the piston nut o-ring (22) and o-ring retainer (20) from the shaft. Remove the plate (24) and the seal (25) from the piston (26).

18.Inspect the piston shaft (19). If it is damaged or the surface is scored, replace it.

19.Clean all piston parts and the cylinder thoroughly in a compatible solvent. Inspect the inner surface of the cylinder for scoring, and replace it if necessary. A scored cylinder will quickly damage the packings.

10 3A0540L