Graco 308149P Displacement Pump Disassembly, Service, Intake Check Valve

Service

Displacement Pump Disassembly

When disassembling the pump, lay out all the removed parts in sequence, to ease reassembly. Clean all parts with a compatible solvent and inspect them for wear or damage. Refer to Fig. 10.

NOTE: Repair Kit 222860 is available to replace the packings and seals. Parts included are denoted with an asterisk, for example (7*). Repair Kit 222974 is available to repair the intake valve. Parts included are denoted with a symbol, for example (10{). For the best results, use all the new parts in the kits. Conversion Kit 222861 is available to convert the pump to all PTFE v-packings, and Conversion Kit 222862 is available to convert to leather v-packings. See page 29.

1.	Remove the displacement pump from the air motor
	as explained on page 16.
2.	Hold the flats of the priming piston rod (12) with an
	adjustable wrench, and use a second wrench to
	unscrew the priming piston nut (14) from the rod.
	Slide the priming piston (15) and guide (13) off the
	rod. Inspect the outer surface of the guide (13) and
	the inner and outer surfaces of the piston (15) for
	scoring, wear, or other damage.
3.	Stand the pump upright in a vise. Loosen the
	packing nut (2) using the packing nut wrench (104)
	supplied, or a hammer and brass rod. Using a
	socket wrench, remove the six capscrews (32).
4.	Tap the underside of the outlet housing (19) with a
	rubber mallet to loosen the housing from the

8.Place the flats of the displacement rod (1) in a vise. Using a 13 mm (1/2 in.) diameter brass rod, pry the intake check valve assembly away from the rod guide (18) far enough to apply wrenches to the valve assembly. See Fig. 7.

INTAKE CHECK VALVE

12

10

9

18

1

113 mm (1/2 in.) Diameter Brass Rod.

6

01171

Fig. 7

9.Hold the valve body (10) steady with a wrench on the flats. Using an adjustable wrench, loosen the intake packing nut (9) to decrease tension on the priming piston rod (12). Now slide the intake valve assembly off the rod and set it aside. See Fig. 8.

cylinder (4). Lift the outlet housing off the pump

and set it aside. Be careful not to scratch the

displacement rod (1) while removing the housing.

Remove the seal (39) from the top of the cylinder.

5. Lift the cylinder (4) up off the intake housing (17).

The displacement rod (1), piston assembly, intake

valve assembly, and priming piston rod (12) will

come with the cylinder.

6. Place the cylinder (4) sideways in a vise with soft

jaws. Using a rubber mallet on the end of the

priming piston rod (12), drive the displacement rod

12

1 3

1

2 3

Hold valve body (10)

steady.

(1) and piston assembly out the top of the cylinder.

Continue to pull the rod out of the cylinder until the

2	Loosen intake
	packing nut (9).

priming piston rod (12) comes free.

7. Remove the seal (39) from the bottom of the

cylinder (4). Hold the cylinder up to the light at an

angle to examine the inside surface for scoring or

damage.

3

Fig. 8

When reassembling items 9 and 10, torque to 97–106 N.m (71–78 ft–lb).

See page 22.

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