TM 5-4940-228-14 Key to Figure 4-1: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. Fluid  control  screw Fluid  control  spring 19. 20. Needle   assembly Needle Locknut Locknut  extension Fluid control housing Fluid  control  gasket Trigger  screw Trigger  stud Trigger  assembly Air valve assembly Packing  nut Packing Air valve body Air valve stem Air valve Air valve spring a.  Unscrew  fluid  control  screw  (1)  from  fluid control housing (7). Fluid control spring (2) can now be lifted out. b. Depress trigger assembly (11) to push needle assembly  (3)  from  fluid  control  housing  (7)  part way.  Pull  needle  assembly  (3)  completely  out  with your  fingers. c. Unscrew  fluid  control  housing  (7)  from  gun handle  (36).  Remove  fluid  control  gasket  (8)  from gun handle (36). d. Remove  trigger  assembly  (11)  from  gun  han- dle (36) by unscrewing trigger screw (9) from trig- ger stud (10) and pulling trigger stud (10) from gun handle (36). e. Remove air valve assembly (12) from gun han- dle (36) by unscrewing air valve body (15) from gun handle (36). Air valve stem (16), air valve (17), air valve spring (18) and gasket (19) will now be loose. f. Unscrew packing nut (13) and remove packing (14) from air valve body (15). g. Remove  fan  control  assembly  (20)  from  gun handle  (36)  by  unscrewing  fan  control  body  (22). Disassemble  fan  control  assembly  (20)  by  un- screwing  fan  control  screw  (24)  until  it  is  loose  on fan  rod  assembly  (25).  Next,  unscrew  fan  control head 21) from fan rod assembly (25). Slide fan rod assembly  (25)  out  of  fan  control  body  (22),  pack- ing (23) and fan control screw (24). h. Unscrew  air  nozzle  assembly  (26),  unscrew fluid  nozzle  (27)  and  remove  gasket  (28)  from  gun head (31). i. Unscrew  gun  head  screw  (29)  from  gun  head 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. Gasket Fan control assembly Fan control head Fan control body Packing Fan control screw Fan rod assembly Air nozzle assembly Fluid nozzle Gasket Gun head screw Gasket Gun head Packing  nut Packing Plug Air  connection Gun handle (31)  thru  gun  handle  (36).  Remove  gun  head  (31) and  gasket  (30).  Unscrew  packing  nut  (32)  from gun head (31) and remove packing (33). j. Unscrew   plug   (34)   and   air   connection   (35) from gun handle (36). Disassembly is now complete. 4-16. Cleaning and Inspection. a. Soak all parts in paint thinner; then using a bristled brush, remove all foreign matter from par- ts. CAUTION Do not use metal tools or scrapers to clean air nozzle assembly. If holes are damaged,  spray  pattern  will  be  dis- torted. b. Inspect  all  parts  for  damage  or  excessive  wear. Pay  special  attention  to  threads,  needles,  nozzles, and packing. Replace any defective parts. 4-17. Reassembly. Use Figure 4-1 as a guide and proceed as follows: a. Screw  air  connection  (35)  and  plug  (34)  into gun handle (36). b. Insert  packing  (33)  into  gun  head  (31)  and screw packing nut (32) into gun head two or three threads.  Adjustment  of  packing  nut  (32)  will  be made after assembly procedure is complete. c. Place  gasket  (30)  over  gun  head  screw  (29). Position gun head (31) on front of gun handle (36); 4-4