Komatsu FG25T-14:
fuel issue

I have a komatsu FG25T-14, SN 587119A. Last week lift became hard to get started, when lift would start it would sputter and stall if you got on it and just pressed pedal down all the way. If you eased it down it would rev up smooth but not to full RPM. Took the screen off of it yesterday and cleaned it (last chance screen). Read on here about using pedal to reset the lift, so I tried that. Now lift will not start at all, not sure fuel is getting passed injector assembly. This is a dual fuel lift that is running LP. Any suggestions would be greatly appreciated.
  • Posted 15 Jan 2014 02:08
  • Discussion started by cgarner1979
  • Alabama, United States
Showing items 1 - 3 of 3 results.
The truck uses the Malfunction Indicator Lamp (MIL) in the dash monitor panel to provide a means for determining if there are any Diagnostic Trouble Codes (DTC) stored in the ECM.
If you are successful in doing the accelerator pedal dance to set up the blink codes, you can count the blinks and figure out the 4 digit code number.
There is a diagnostic connector under the floor pan where a diagnostic reader can be connected to read stored codes and see "real time" problems.
If you are saying that there is not a Malfunction Indicator Lamp on the dash, how did you do the pedal dance you alluded to in your opening post?
The MIL should light up when you turn the key on and go out after the engine starts.
If the MIL does not burn when you turn the key on, that in itself is a defective condition, and must be fixed before doing anything else.
On your truck, look at the second light position to the right of the hour meter, the light that has an exclamation point (!) is the MIL.
That light should burn when the key is turned on and should go out after the engine is started.
If the light continues to burn after the engine starts, it is indicating that a defective condition still exists, or that a defective condition has caused a DTC to be stored in the ECM.
That light is what flashes to give you the blink codes for stored DTCs that the ECM may have.
  • Posted 15 Jan 2014 15:45
  • Modified 15 Jan 2014 15:46 by poster
  • Reply by L1ftmech
  • Tennessee, United States
The lift does not have a display on the dash to show any codes, all it has is a hr counter. Yes the screen was covered in grit. Tried cleaning the injector in case I let some of it through, still no luck starting.
  • Posted 15 Jan 2014 05:03
  • Reply by cgarner1979
  • Alabama, United States
You say you tried the pedal dance to reset the lift.
Were you actually able to put the ECM into blink code to show any stored DTCs?
Can you confirm that the MIL (check light) is actually working on the monitor?
Without knowing the answer to the above questions I would venture to guess that the main injector is clogged or defective.
You only stated that you cleaned the last chance screen. You did not say whether you found anything on the screen.
If you found any gritty material (loose like sand) and removed the screen while the injector holder was still mounted to the engine, you may have let some of that material get into the fuel passages below and subsequently migrated on into the injector.

Cleaning the main fuel injector with spray carb cleaner might yield an improvement in how it runs, however, I have found that simply cleaning out the injectors seldom.completely cures the issues
  • Posted 15 Jan 2014 04:23
  • Reply by L1ftmech
  • Tennessee, United States

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