Graco 3A0735J Manuel d'utilisateur télécharger pdf (Page 13)

Service

3A0735J 13

Reassemble the Pump

NOTE: Any damaged rubber parts must be replaced as

they could harbor microorganisms that can contaminate

the fluid.

NOTE: Lubricate the o-rings, throat packings, and piston

seals with appropriate waterproof sanitary lubricant

prior to installation.

1. Install the bearings (110*) and the u-cup seal (109*,

24G761 only) on the piston (107). The lips of the

piston u-cup must face up. Install the valve plate

(108) and piston assembly on the displacement rod

(105). Cutout on piston must face down.

2. Use wrenches on the displacement rod flats and the

piston rod flats to reconnect. Torque to 60-70 ft-lb

(81-95 N•m).

3. Install the packing stack (116*) into the intake valve

housing (115). Maintain the following order: shims

(116a), female gland (116b), five v-packings (116c)

with the lips facing up, and male gland (116d).

Loosely thread packing nut (117) into the valve

housing (115).

4. Install the u-cup (103c*) and insert (103b*) into the

u-cup seal assembly base (103a). Throat u-cup lips

must face down. Then install the o-ring (103d*).

5. Lubricate the displacement rod/piston rod assembly

and slide into the cylinder from the top.

6. Install the u-cup assembly (103) in the top of the cyl-

inder (101). Reassembly may be difficult. Use

steady force until the assembly drops into place.

7. Turn the pump on its side. Use a rubber mallet to tap

the displacement rod so the piston rod extends well

out of the cylinder.

8. Install the valve plate (112) and the spacer (113)

into the bottom of the cylinder. Install the cylinder

o-ring (123*).

9. Lubricate the piston rod and the inside of the pack-

ing nut (117) and intake valve housing (115). Slide

the assembly onto the piston rod, then use two

wrenches to tighten the valve housing.

10. Stand the pump upright, placing the cylinder (101)

into the base (102). Reattach the clamp to hold the

base (102) to the cylinder (101). Replace the pin

(125).

11. Turn the pump on its side. Use a rubber mallet to tap

the displacement rod so the piston rod extends well

out of the cylinder.

12. Hold the displacement rod (105) with a wrench.

Screw on the guide (119) and use another wrench

to tighten.

13. Install the valve plate (120) and the priming piston

(121). Hand tighten the priming piston nut (122).

14. Hold the displacement rod (105) with a wrench. Use

another wrench to tighten the priming piston nut

(122).

FIG. 6. Intake valve housing

116a

116b

116c

116d

117

115

ti15568a

FIG. 7. Valve plate

123*

112

113

ti15798a

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Graco 3A0735J Manuel d'utilisateur Page 13

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