Reassembly, Service | Graco 308149P specification

Service

Reassembly

Refer to Fig. 11 for reassembly.

1.Install the intake valve seat (11{) in the intake housing (17), with the large bevel of the seat facing the bottom of the housing. Lubricate the seal (39*{) and install it in the housing. Set the intake housing aside.

2.Install the piston seal (7*) on the piston seat (8). Place the seat in a vise and close the jaws tight enough to hold it securely, without placing too much stress on the part. Apply thread sealant to the threads of the seat and the piston guide (5). Screw the guide onto the seat (8). Tighten using a brass rod until the guide is securely seated, approximately 125–137 N.m (92–101 ft–lb). See Figs. 9 and 11.

3.Place the flats of the piston (6) in a vise. Apply thread sealant to the threads of the rod (1) and the top threads of the piston. Set the piston seat/guide assembly onto the piston.

NOTE: Service Tool 109508 is available as an acces- sory. The tool fits over the top of the displacement rod (1), making it easier to apply a 24 inch adjustable wrench or 3/4 in. drive socket when connecting the rod to the piston (6).

4.Screw the rod (1) into the piston (6) hand tight. Torque the rod to 459–481 N.m (338–354 ft–lb). There will be a small gap between the top of the piston (6) and the shoulder of the rod (1).

5.Apply thread sealant to the bottom threads of the piston and the top threads of the priming piston rod (12). Using an adjustable wrench on the flats of the rod, screw the rod into the piston. Torque to 125–137 N.m (92–101 ft–lb). Be careful not to create burrs on the flats of the rod.

6.Slide the rod guide (18) onto the priming piston rod (12), making certain that the end nearest the valve stop (VS) goes on the rod first. See the Detail in Fig. 11.

7.With the beveled side facing up, press the seal (43*) into the recess of the intake packing nut (9) until it snaps into place. The nose of the seal

should be flush with or slightly recessed into the face of the packing nut.

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8.Lubricate the intake valve packings and the inner diameter of the valve body (10{). Install the pack- ings one at a time in the following order, with the lips of the v-packings facing up: the female gland (41*), one PTFE v-packing (40*), one UHMWPE v-packing (42*), PTFE(40*), UHMWPE (42*), and the male gland (16*). Screw the intake packing nut (9) into the valve body (10) handtight. See the Detail in Fig. 11.

9.Slide the assembled intake valve onto the priming piston rod (12), making certain that the packing nut

(9)goes on the rod first. Push the valve assembly up the rod, stopping before it reaches the rod guide (18).

10.Hold the valve body (10) steady with a wrench while using an adjustable wrench to tighten the packing nut (9). See Fig. 8. Torque to 97–106 N.m (71–78 ft–lb). Use a hammer and brass rod to carefully drive the valve assembly further up the rod until it reaches the stop (VS).

11.Remove the displacement rod (1) from the vise. Place the cylinder (4) sideways in the vise with soft jaws.

12.Lubricate the seal (39*) and place it on the bottom of the cylinder (4). (The cylinder is symmetrical, so either end can be the bottom.) See Fig. 11.

13.Slide the displacement rod (1), piston assembly, intake valve assembly, and priming piston rod (12) into the cylinder (4) from the bottom, until the mating surfaces of the rod guide (18) and cylinder

(4)meet.

14.Put the intake housing (17) upright in a vise, making sure it is off-center so there is sufficient clearance for the priming piston rod (12) to be lowered through the housing. Take the rod and cylinder assembly and lower it into the intake housing until the rod guide (18) bottoms on the intake seat (11) and the priming piston rod (12) protrudes from the bottom of the intake housing

15.Screw the bleeder valve plug (35) into the valve housing. The plug has two sets of threads. When reassembling, be sure to screw the plug fully into the valve housing.

NOTE: It is not ordinarily necessary to remove the outlet nipple (20) and o-ring (25*). However, if they were replaced because of damage, lubricate the o-ring (25*) and place it on the nipple (20). Screw the nipple into the outlet housing (19). Torque to 156–171 N.m (115–126 ft–lb).