Graco 308-017 warranty Reassembly Refer to Fig

Reassembly (Refer to Fig 7)

1.Place a 13 mm (1/2 in.) dia. brass rod lengthwise in a vise. Install a new piston seal (15*) on the piston seat. Apply thread sealant to the threads of the piston seat. Place the piston guide (14) securely on the brass rod. Using a 32 mm crow’s-foot, screw the pis- ton seat (16) into the piston guide. Torque to 27-34 N.m (20-25 ft-lb).

2.If it was necessary to remove the priming piston rod

(24)from the piston (13), apply thread sealant to the threads of the rod. Place the flats of the piston (13) in a vise. Hold the flats of the rod with a 12 mm wrench, and screw the rod into the piston. T orque to 45-53 N.m (33-39 ft-lb).

3.Use a vise with soft jaws to hold the displacement rod

(1)by its flats. Install the spacer (33, see the follow- ing note) on the rod. Install the assembled piston gui- de/seat on the piston (13). Apply thread sealant to the threads of the displacement rod, and screw the piston assembly onto the rod, using a 19 mm wrench on the flats of the piston. T orque to 120-130 N.m (88-95 ft-lb). There will be a small gap between the top of the piston (13) and the shoulder of the rod (1).

NOTE: The piston spacer (33) is not required when pumping fluids with a viscosity greater than 1 mil- lion centipoise.

4.Screw the handle of the bleeder valve (35) into the valve housing. The handle has two sets of threads. When reassembling, be sure to screw the handle ful- ly into the valve housing.

NOTE: It is not ordinarily necessary to remove the outlet nipple (8) and o-ring (9*). However, if they were replaced because of damage, lubricate the o- ring (9*) and place it on the nipple (8). Screw the fitting into the outlet housing (10). T orque to 70-75 N.m (51-55 ft-lb).

5.Lubricate the o-rings (11*) and install them on the cyl- inder (12). Apply thread lubricant to the top threads of the cylinder. Using a 400 mm wrench on the flats of the cylinder, screw it into the outlet housing (10).

Torque to 256-297 N.m (190-220 ft-lb).

6.Lubricate the throat packings and glands, and install them in the outlet housing (10) one at a time in the following order, with the lips of the v-packings fac- ing down: male gland (6**), UHMWPE v-packing (5**),PTFEr v-packing (3**), UHMWPE (5**),PTFE (3**), UHMWPE (5**), and female gland (4**). Apply thread lubricant to the packing nut (2) and install the nut loosely in the outlet housing.

7.Carefully insert the displacement rod (1) into the bot- tom of the cylinder (12). Push the rod up into the cyl- inder and through the outlet housing (10), until it pro- trudes from the packing nut (2). Be careful not to

damage the piston seal (15*) while performing this step.

8.Apply thread lubricant to the bottom threads of the cylinder (12). Be sure the o-ring (11*) is in place on the cylinder. Guide the intake valve housing (17) up onto the priming piston rod (24) and screw it onto the

cylinder, using an adjustable wrench. T orque to 256-297 N.m (190-220 ft-lb).

9.With the beveled side facing up, press the seal (42) into the recess of the intake packing nut (18) until it snaps into place. The nose of the seal should be flush with or slightly recessed into the face of the packing nut.

10.Apply sealant to the threads of the intake packing nut

(18).With the threads facing down toward the pump intake, slide the nut up onto the priming piston rod

(24)until it clears the flats of the rod.

11.Lubricate a new intake valve seal (20*) and slide it onto the rod, being careful not to damage the seal when passing over the flats of the rod. Slide the seal up until it reaches the packing nut (18). Apply sealant to the female threads of the intake valve body (19), and slide it onto the rod until it reaches the nut (18).

12.Place a 26 mm wrench on the flats of the packing nut

(18)and a 28 mm wrench on the flats of the valve body (19). Screw the nut into the body, making cer- tain they remain in position above the flats of the rod

(24).Torque to 45-53 N.m (33-39 ft-lb). Slide the as- sembled intake check valve up the priming piston rod until it reaches the stop (T); this may be difficult due to high friction between the seal and rod.

13.Position the intake valve seat (22) so its large bev- eled side faces down toward the pump intake. Slide the seat (22) onto the priming piston rod (24) and into the intake valve housing (17) until it seats on the low- er lip of the housing. Lubricate a new seal (21*) and push it up into the gap around the bottom outer edge of the seat (22).

14.Apply thread lubricant to the threads of the intake cyl- inder (23) and screw the cylinder into the intake valve housing (17), using an adjustable wrench. Torque to 256-297 N.m (190-220 ft-lb).

15.Slide the priming piston guide (31) onto the rod (24) until it stops. Then install the priming piston (25) with the flat side of the priming piston (25) facing up to- ward the pump. Apply thread sealant to the threads of the priming piston rod (24). Hold the rod steady with a 12 mm wrench on the flats, and screw the priming piston nut (30) onto the rod with a 22 mm wrench. Torque to 45-53 N.m (33-39 ft-lb).

16.Reconnect the displacement pump to the air motor as explained on page 9.

17.Allow 2 hours for the thread sealant to cure before re- turning the pump to service.

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