Graco 312350K important safety instructions Reassembly

Reciprocator Repair

12.Secure hex end of displacement rod (34) in a vise. Use a spanner wrench (sw) in pin holes of the piston (22) to remove the piston from the displacement rod.

2234

sw

FIG. 21

13.Visually inspect the spring (21). If there is wear or damage, remove nut (18), spring (21) and retainers

(20)from the trip rod (12) (FIG. 22).

12

20

21

20

18

FIG. 22

Reassembly

NOTE:

•Use a surface cleaner such as chlorinated sol- vent on the threads of all parts that are being reused for reassembly. Blow part with com- pressed air.

•Use a 1/4-28 UNF-2A tap to remove adhesive from internal threads of yoke (9).

•Thread sealer and primer are required. See Reciprocator Repair Notes, page 14 for specifi- cation.

•Loctite 609 is used only in Step 3 of this proce- dure.

1.If needed, install a new spring over trip rod as fol- lows (FIG. 23):

•one retainer (20),

•new spring (21),

•second retainer (20).

20

21

20

18

FIG. 23

2.Thread nut (18) onto rod until it runs out of thread so that it bottoms out on the rod’s shoulder (FIG. 23).

3.If valve yoke (9) was removed from trip rod (12) during the disassembly procedure, apply Loctite 609 thread sealant to first two or three internal threads of yolk (9).

4.Apply Primer to external threads of trip rod (12). Allow Primer 3-4 minutes to dry. Install trip rod to yoke (9). Torque to 54-56 in.-lbs (6.1 to 6.3 N.m). Remove excess sealant.

5.Apply Loctite 242 or Perma-Loc 115 thread sealant to first two to three threads of valve assembly (31).

6.If capscrews (51) were removed during the disas- sembly procedure, apply thread sealant to the first two or three internal threads of valve stop (26) (FIG. 24, page 17).

7.Apply Primer to external threads of valve sleeve (29). Allow Primer 3-4 minutes to dry. Install cap screws (51). Torque to42-45 in.-lbs (4 to 5 N.m). Remove excess sealant.

NOTICE

In order to ensure a tight and secure seal, allow 24 hours for sealant applied in Steps 3 and 5 to cure before operating reciprocator.

8.Remove o-ring (13) from bottom of cylinder cap (31) and replace it with a new o-ring.

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