7
5. Maintenance and Cleaning (continued)
Reassembly
, Refer to Figure 5.
1. Apply silicone grease (997569) onto o-ring (5) and install onto luer adapter (3).
2. Apply silicone grease (997569) onto the threads of the luer adapter (3) and install luer
adapter to valve body (1).
3. Install new dispense tip.
4. Apply silicone grease (997569) onto thread of needle retaining cap (2) and install onto the
Luer adapter (3).
5.2 Procedure for Replacing Needle Valve Assembly
Tools required: 7/64" hex wrench, 7/16" open end wrench, snap ring pliers, O-ring tool.
Purging: Clean by purging valve with Loctite
®
Equipment Flushing Solvent P/N 12121.
Notice:
To prevent possible damage to seal components, please follow these instructions in the following
sequence. Refer to Figure 5.
1. Relieve reservoir product pressure.
2. Remove all hoses and fittings from valve.
3. Unscrew the needle retaining cap (2) and remove the dispense needle.
4. Remove the three screws (17).
5. Pull the valve housing (1) away from the air cylinder (12).
6. Remove the luer adapter assembly (3) from the valve housing (1).
7. Clean and inspect the needle rod (4) and luer adapter assembly (3) for wear and damage.
Replace parts as necessary.
8. Replace O-ring (8), if necessary. Make sure to lubricate new O-ring with silicone
grease (997569).
9. Remove the end cap (15) by turning counterclockwise.
10. Carefully remove the spring (14) and the two nylon washers (16).
11. Remove the retaining ring (13).
12. Pull the needle rod and piston assembly (4) straight out from the air cylinder (12).
13. Replace O-ring (11), if necessary, and apply silicone grease (997569).
14. Remove the retainer ring (7), the nylon washer (9) and the o-ring (10) from the air
cylinder (12).
15. Clean and visually inspect all parts for damage. Replace parts as necessary.
16. Reinstall the o-ring (10) and apply silicone grease (997569).
17. Insert the nylon washer (9) and secure with the retaining ring (6).
18. Reinstall the needle/piston assembly (4) in the air cylinder (12).
19. Reinstall the retaining ring (13).
20. Reinstall the spring (14) and two nylon washer’s (16).
21. Reinstall the end cap (15).
22. Reinstall the luer adapter assembly (3) to the valve housing (1).
23. Align the valve housing (1) to the air cylinder (12) and reinstall the three screws (17).
Notice:
Alternately tighten the screws a little at a time until they are secure.
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