Hyster H155FT:
DTC 520304-1

Hey all. Have access to Yale service manual and this code isn't listed. Can anyone tell me what it's for. It has disabled the truck

Thanks in advance
  • Posted 9 Aug 2023 06:24
  • Discussion started by Roy_Baumeister
  • British Columbia, Canada
Showing items 1 - 4 of 4 results.
Thanks. I have service passwords and calibrate every transmission service/1000 hrs.
  • Posted 7 Sep 2023 23:19
  • Reply by Roy_Baumeister
  • British Columbia, Canada
Also the transmission should be recalibrated every 2000 to 3000 hours or anytime the transmission is serviced. This will calibrate the clutch packs. But will have to be done by a Hyster certified technician and use of a laptop or Service Password.
  • Posted 7 Sep 2023 23:02
  • Reply by Jessy_Gomez
  • Texas, United States
Appreciate the reply. 5000 hour truck with fluid and filter changed every 1000 hours. I will monitor. So far error has not reoccurred.
  • Posted 6 Sep 2023 02:40
  • Reply by Roy_Baumeister
  • British Columbia, Canada

Your forward clutch pressure reading is below normal operating range, most severe. Need to verify transmission fluid is at level. Check trans filter to see when it was last changed. If the filter is solid black it has never been changed. Could have a failed pressure relief valve, but would expect additional codes. Depending on hours and age, operations of lift, clutch pack could be worn out. Have known the transmission harness to fail, possible failed connection. Good Luck
  • Posted 6 Sep 2023 01:29
  • Reply by Fishmech
  • Virginia, United States
The hard to do we do right away. The impossible just takes a little longer.

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