Repairing John Deere 4440 Injectors

Our guess is the rust and nozzle wear on these John Deere 4440 Injectors is just from time, wear and tear and weather.

Visual Check

  • Repairing John Deere 4440 Injectors
  • Repairing John Deere 4440 Injectors

Damage to nozzle nuts, inlet thread and outlet surface – this can occur from wear and tear and weather

Pop test to check spray pattern and pressure

  • Repairing John Deere 4440 Injectors
  • Repairing John Deere 4440 Injectors

Nozzle nut pitted and cracked

  • Repairing John Deere 4440 Injectors

Injector Bodies come out of acid clean and are polished. Next into sonic cleaner to remove some more scale, internal parts go into a tea strainer and into sonic cleaner

  • Repairing John Deere 4440 Injectors
  • Repairing John Deere 4440 Injectors

New genuine Bosch nozzle nuts, plate and nozzles

  • Repairing John Deere 4440 Injectors

Pressure is set to 270bar for these injectors, spray pattern is then checked .

  • Repairing John Deere 4440 Injectors
  • Repairing John Deere 4440 Injectors

We check edge filters are clean and not blocked, lay parts out ready to assemble and adjust pressure using shim thickness. A Micrometer is used to measure shims.

  • Repairing John Deere 4440 Injectors
  • Repairing John Deere 4440 Injectors
  • Repairing John Deere 4440 Injectors

BEFORE AND AFTER INJECTOR REPAIR

  • Repairing John Deere 4440 Injectors
  • Repairing John Deere 4440 Injectors

Thanks! You've already liked this