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Dec 12th, 2019
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  1. 12 DEC 2019
  2. Work for Bradley Wilkin
  3.  
  4. Investigate non-firing GEN8 M4SS
  5. --------------------------------------
  6. Findings
  7. :Main wiring loom loose, shorting and frayed - wires not connected - poorly soldered
  8. :Trigger switch not soldered properly and negative wire loose
  9. :Positive magazine terminal wire frayed and damaged - poorly soldered
  10. :Bad wire joins - poor soldering
  11. :Gears NOT shimmed
  12. :Spur gear excess friction top and bottom - causing stress to gearbox, motor and wearing bushes
  13. :Bushes not glued in or shimmed properly - coming loose, potential for catastrophic gearbox failure
  14. :Gearbox dry and not lubricated sufficiently
  15. :Barrel t-piece bad seal and leaking
  16. :Piston metal rack angle of engagement (AOE) incorrect - sector not disengaging at piston rearwards position causing catastrophic gearbox jam
  17.  
  18.  
  19. Repairs carried out:
  20. :Main wiring loom rewired, bad joins fixed and checked
  21. :Trigger switch replaced and resoldered
  22. :Positive magazine terminal wire heat shrink applied and protected
  23. :Gears properly shimmed, top and bottom - gears do two revolutions unlubricated with minimal effort - correct gear mesh and contact
  24. :Entire gearbox degreased and regreased - INOX MX6 silicone grease applied to gears and plastics, RC silicone shock oil applied to orings and cylinder
  25. :Bushes glued in place and shimmed
  26. :Barrel t-piece painted with glue sealant - no leaks
  27. :Barrel properly cleaned and defects removed
  28. :All gearbox and receiver screws treated with anti rust
  29. :Return spring treated with anti rust
  30. :Trigger reseated with spring correctly placed
  31. :All wiring inspected and appears in an OK condition
  32. :1 brass bushing replaced due to damage
  33. :First tooth on piston rack shaved down to correct AOE and allow sector to disengage and piston to return forwards
  34.  
  35. No other items were replaced and are left in an 'as is' condition.
  36.  
  37. Chrono test returned average 285FPS using 'gold packet' milkies.
  38.  
  39. Recommendations:
  40. :Keep up with regular maintenance and servicing
  41. :Entire wiring loom redone/replace
  42. :Reduce spring size or upgrade to higher quality battery (turnigy)
  43.  
  44. Cost:
  45.  
  46. POL use:
  47. :INOX grease
  48. :RC silicone shock oil
  49. :CRC 2-26
  50. :Cyanoacrylate
  51.  
  52. Consumables:
  53. :6x shims
  54. :1x brass bushing
  55. :Solder
  56. :Heat shrink
  57. :Wire
  58. :Microswitch
  59.  
  60. Labour:$60 (@30/hr)
  61.  
  62. Total: $60.00
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