Komatsu FG15ST-17:
No forward or reverse

The transmission on this truck quit working while driving. Everything on the truck works fine but the tranny. It has no forward or reverse. It is not sending power to the solenoids. No fuses blown. We switched relays. We also checked the diodes with a meter and they show good. With the truck running
the ! symbol in the dash is flashing 6 times.
  • Posted 11 May 2010 06:09
  • Discussion started by scot_m
  • North Carolina, United States
Showing items 1 - 4 of 4 results.
where are located the diodes? did any got a wiring diagram?
  • Posted 11 May 2012 01:58
  • Reply by daniel_d
  • baja california, Mexico
igot a similar problem,
inthe transmition controller , this one receives signal from the f&r switch to the controller but these controller does'nt give the signal to the trannny solenoids.
i dont know if the controller is the problem.
is this is the case can be repaired or just need to buy a new one.
  • Posted 11 May 2012 01:54
  • Reply by daniel_d
  • baja california, Mexico
I should have posted this earlier. We changed the relays
and that fixed the problem.
  • Posted 9 Jul 2010 01:28
  • Reply by scot_m
  • North Carolina, United States
even tho they tested good you might want to try a new one we had a similar problem. also might want to check wiring inside the relay bod to make sure every thing is connected. i would also change the relay to make sure there arnt 2 bad.
  • Posted 8 Jul 2010 07:49
  • Reply by DennisW
  • California, United States

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