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18. Completely unscrew the nut of the rear closing seal by turning it clockwise (see Figure. 16,
page 14).
Clean the conic housing of the nut with paper dampened in gun cleaning solvent. Do not
use metal elements to clean the conic housing, a scratch on the surface could cause it to
close badly with the module and this might cause leaks of the chemical products.
19. Remove the rear closing seal and clean it with gun cleaning solvent or replace it if it is very
worn.
20. Clean the mixing block with gun cleaning solvent.
PRECAUTION!
The module and the rear seal with the mixing block are closed with a
precision cone. Take particular care when cleaning these components to avoid damaging
their surface finish. Use wooden or plastic utensils or a brass brush for cleaning. Do not
use metal utensils that could scratch the contact surfaces.
21. Before reassembling the whole unit, it is important to make sure that all of the components
are clean and free of any defect, make sure there is no damage to any of the components
before continuing with the assembly.
22. Insert the rear closing seal in the mixing block and hand tighten the retention nut at the
rear of the block without tightening excessively.
23. Fit the o-ring and fix the mixing block to the gun support with the bolt.
24. Insert the needle in its housing using the air cylinder piston and tighten it using the tube
socket. Insert a socket in the hexagon of the plunger shaft to prevent it from turning
25. Fit the spring in the pneumatic cylinder head.
26. Fit the safety device. Press and turn the device clockwise to set it to its blocking position.
27. Fit the non-return units and the filter bolt.
28. Fix the gun in a support or a vice where it can be held firmly, to be able to handle it with
your two hands without it moving.
29. Connect the air supply.
30. Put "HI-TECH" grease on the threads of the module tightening nut and in the threaded
housing of the mixhead.
31. Insert the module on the tip of the needle, making sure the metal positioning pin is in line
with the non-turning hole of the mixhead.
32. Press the front of the mixing module with your hand while squeezing the trigger, so that the
needle moves back.
33. The module positioning pin must have been inserted in the non-turning hole of the
mixhead.
34. Without releasing the trigger, fit the module tightening nut, turning it clockwise.
35. Tighten the nut by hand as far as you can. Now using a socket, tighten the nut clockwise.
36. Release the trigger and make sure the needle moves forward. Squeeze the trigger 2 or 3
times to make sure that the needle moves backward and forward correctly.
37. Make sure that the rear closing seal nut is tight, if not turn it clockwise with a spanner.
WARNING:
Take particular care when tightening the module nut and the rear closing
seal nut with the socket.
Excessive tightening can result in the pneumatic cylinder not having sufficient force to
move the needle. If it is too loose, it might cause leakage from the mixing module.
22/28
1.5 Issue
http://www.novag.eu/
Projection Gun novaG-M
Service Manual
Ref. NR-00018-ENG
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