Graco 308550ZAD important safety instructions Reassembly

Service

1	Insert narrow end first.	3	Install with lips facing
			narrow end of piston (11).
2	Grease.	4	Insert wide end first.

10{H 2 3

11 4

12

2 17{ 15 16 1

04901

Fig. 9

Reassembly

1.If you removed the bearings (12, 15), install new ones as explained on page 23. Reassemble the fluid section.

2.On aluminum center housing models, install the valve plate seal (9{) into the groove at the bottom of the valve cavity. The rounded side of the seal must face down into the groove. See Fig. 10.

3.Install the valve plate (8H) in the cavity. On alumi- num center housing models, the plate is reversible, so either side can face up. Install the three screws (3), using a Torx (T20) screwdriver or 7 mm (9/32”) socket wrench. Tighten until the screws bottom out on the housing. See Fig. 10.

4.Install an o-ring (17{H) on each pilot pin (16). Grease the pins and o-rings. Insert the pins into the bearings (15), narrow end first. See Fig. 9.

5.Install a u-cup packing (10{H) on each actuator piston (11), so the lips of the packings face the narrow end of the pistons. See Fig. 9.

1	Rounded side must face down.	3 2
2	Tighten screws until
	they bottom out on the
		8H
	housing.

9{ 1

03947

Fig. 10

6.Lubricate the u-cup packings (10{H) and actuator pistons (11). Insert the actuator pistons in the bearings (12), wide end first. Leave the narrow end of the pistons exposed. See Fig. 9.

7.Grease the lower face of the pilot block (18{H) and install so its tabs snap into the grooves on the ends of the pilot pins (16). See Fig. 8.

8.Grease the o-ring (6{H) and install it in the valve block (7{H). Push the block onto the valve carriage

(5). Grease the lower face of the valve block. See Fig. 8.

9.Install the valve carriage (5) so its tabs slip into the grooves on the narrow end of the actuator pistons (11). See Fig. 8.

10.Align the valve gasket (4{H) and cover (2) with the six holes in the center housing (1). Secure with six screws (3), using a Torx (T20) screwdriver or 7 mm (9/32”) socket wrench. Torque to 50–60 in-lb (5.6–6.8 NSm). See Fig. 7.

308550 17