Discussion:
Low torque

On this Cat EP20KT, ETB5B
Rebuilt drive motor.
Replaced drive card.
No trouble code.
Drive good when drive wheels off ground.
But low torque when driving on ground.
10 miles off ground, 1 mile on ground.
Can anyone help ?
  • Posted 16 Jun 2011 08:16
  • Modified 16 Jun 2011 08:43 by poster
  • By hellokitty
  • joined 11 Mar'09 - 86 messages
  • Ontario, Canada
Showing items 1 - 6 of 6 results.
no, I mean a micro switch under the floorboard, somewhat "nestled" under the lever that moves when you push the brake pedal down. it may have lost the shiny lever part of the switch.
  • Posted 18 Jun 2011 20:42
  • By edward_t
  • joined 5 Mar'08 - 2,334 messages
  • South Carolina, United States
"it's not rocket surgery"
do you mean the pot?
  • Posted 18 Jun 2011 01:48
  • By hellokitty
  • joined 11 Mar'09 - 86 messages
  • Ontario, Canada
check not -ONLY- parking, but foot pedal brake switch too.
code 10 was most likely a drive motor, my book says it is the right motor armature circuit.
the low power, with no codes, I still think is the foot brake switch circuit.
  • Posted 17 Jun 2011 08:09
  • Modified 17 Jun 2011 11:54 by poster
  • By edward_t
  • joined 5 Mar'08 - 2,334 messages
  • South Carolina, United States
"it's not rocket surgery"
this truck had a code 10. then was found left side drive motor burnt, so it was rebuilt. right motor seems good. also found drive card bad, new card put on.
just checked parking brake switch, is fine.

pot problem ?
  • Posted 17 Jun 2011 01:44
  • By hellokitty
  • joined 11 Mar'09 - 86 messages
  • Ontario, Canada
this is almost for sure the brake (park of foot pedal) switch or the circuit to it.
On this unit, the brake switch does not completely cut off traction, it just cuts out power from the drive circuit so much so that you can not make it up a ramp.
  • Posted 16 Jun 2011 20:28
  • By edward_t
  • joined 5 Mar'08 - 2,334 messages
  • South Carolina, United States
"it's not rocket surgery"
Hi hellokitty,
The armature can be the cause to this problem. Usually the drive motor will run freely with no load, but when put on load, the motor will either run slow or not run at all.
  • Posted 16 Jun 2011 15:56
  • By richard_y
  • joined 9 Feb'07 - 66 messages
  • Singapore, Singapore

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