Graco Dispensit 792-20 [7/14] Periodic maintenance

PERIODIC MAINTENANCE

MATERIAL HOSE REPLACEMENT

If material hose renewal is not feasible then follow these steps to replace the material hose.

Note: To change the Material Hose, DO NOT disassemble the valve.

1. Depressurize the material reservoir, and remove/disconnect it.

2. Pressurize the Pinch-off Piston (11). This is the purge mode. The Material Hose (16) will now be

completely free of compression.

3. Loosen the upper and lower Knobs (13) enough to allow the Material Hose (16), Top Tube Adapter

(12), and Bottom Tube Adapter (17) to pass out the side of the valve.

4. If your valve has a Hose Adapter (19), disconnect downstream fittings as required so that the Hose

Adapter can be turned freely.

5. Depending on the valve configuration disconnect either the Needle Assembly (18) or Hose Adapter

(19) from the Bottom Tube Adapter (17).

6. Remove the Bottom Tube Adapter (17) and Top Tube Adapter (12) from the Material Hose (16).

Discard the old material hose.

7. Slide the Top Tube Adapter (12) hexagon end up onto the new Material Hose (16).

8. Slide Bottom Tube Adapter (17) onto the new Material Hose (16) until the hose is flush with the end of

the adapter.

9. Depending on the valve configuration, insert the steel end of the Hose Adapter (19) or Needle

Assembly (18) into the end of the Material Hose (16) and tighten onto the Bottom Tube Adapter (17).

10. Slide the Top Tube Adapter/Material Hose/Bottom Tube Adapter Assembly (12, 16 & 17) through the

side of the valve.

11. Gently tighten the upper and lower Knobs (13).

12. Connect any downstream fittings that you disconnected from the Hose Adapter (19).

13. Connect the material reservoir and pressurize it.

14. Perform the Wet System Checkout and return to operation.