Komatsu FG25T-16:
No dash lights, engine won't rev past 1300 rpms

checked the fuses and relays, all check good, no power to the dash at all, no hour meter either. As for the engine, it's gasoline/LPG, and after clearing the tar from the vaporizer, it will rev normally (gas or LPG) until I shut the machine off, then it levels out at 1300 rpms until I again 'clear the tar'. However, there is nothing coming out of the hole other than the pressurized gas from the LPG supply hose.
  • Posted 13 Aug 2013 02:04
  • Discussion started by eric_h
  • Michigan, United States
Showing items 1 - 2 of 2 results.
"Clearing the tar" from the LPG injector holder last chance filter, or from the LPG vaporizer (if that is what you refer to) should not have any bearing on how it operates on gasoline.
So, have you been trying it on gasoline as well as LPG?
However, if you have not cleaned that "last chance filter screen in the LP injector holder assembly, that could still be a fuel starvation point, and cause it to fail to rev to full RPM
You say you "have no dash lights or hour meter". If the engine MIL (Malfunction Indicator Lamp) is not lighting up when you turn on the key switch BEFORE YOU START THE ENGINE, the MIL not operating is also considered to be a "serious defective condition" by the ECU and the ECU WILL limit the RPM based on that until the MIL is i working order.
So, if you have some kind of loss of ground to the dash, or loss of a power circuit (fuse blown or bad wiring connection) feeding the dash/monitor, the ECU is probably keeping the RPM limited because the MIL is not functioning.
This RPM limiting effect would be present whether you selected gasoline of propane fuel
  • Posted 2 Aug 2014 23:45
  • Modified 2 Aug 2014 23:46 by poster
  • Reply by L1ftmech
  • Tennessee, United States
There are also relays mounted up were the hydraulic levers are maybe also a vehicle controller issue
  • Posted 29 Jun 2014 14:59
  • Reply by clinton_b
  • Queensland, Australia

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