Cat Lift Trucks (& Caterpillar) E3000:
No Aux functions or travel

Hello, Caterpillar dock truck Serial # A4EC110214. Key on, dash display lights up Flashes an L then E72. Battery volts 50. Steer motor does not run. Main fuses all check good. I have not worked on this type of lift with this control system. Cannot find ANY literature. I could use a link for trouble charts and wiring.
Thank you for any input
  • Posted 10 Dec 2015 02:50
  • Discussion started by Libbey
  • Texas, United States
Showing items 1 - 6 of 6 results.
Thank you for the good information. I will catalog this info. I was doing the work as a favor for a non profit, and because I was only able to do the repair after hours or on the weekends they decided to call NJ Malin and pay for the repair. When I tried to follow up I got no reply from them. Thanks again. its good have a knowledgeable people to get good info from.
  • Posted 25 Apr 2016 22:50
  • Reply by Libbey
  • Texas, United States
the 'L' indicates a faulty setting for hydraulic or seat switch

check the seat switch and circuit first before diving into the other checks for the E72

now as for the E72 it does not designiate any particular contactor coil, the system just sees that one of them is not passing the post test and shuts the system down.
in possible causes it lists them as:
-faulty line contactor
-faulty steering contactor
-faulty pump contactor
-faulty main harness
-faulty logic unit

so you have your work cut out for you to find the problem.

since you are getting the 'L' code first my guess is the seat switch circuit is failing and the system may be seeing a contactor issue right after it throws the code for the L so it follows it up with the 72 code because the contactor is not pulling in when it expects to see it.
one other thing you may want to check is the logic card connector plugs, make sure they are plugged in and also pull them and check the pins for corrosion.
  • Posted 25 Apr 2016 06:30
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Thank you for the follow up. That helps. I won't be able to get back to it until next week. I'll post the fix.
  • Posted 11 Dec 2015 03:34
  • Reply by Libbey
  • Texas, United States
The code definition is Contactor coil fault. possible causes faulty line,steering or pump contactor, faulty main harness. faulty logic unit.
just gave you the quik version yesterday as i was in a hurry. but wanted to give you my 2 cents. Lol. so checked all the contactors burnt? resistance? check all wiring to and from. check for frame shorts and grounds. good luck!
  • Posted 10 Dec 2015 22:15
  • Reply by Adams1
  • Indiana, United States
Thank You. I can see the wiring and the contactors. Getting to them is another story. The wires are connected and appear in good shape. It looks like the contactors are in series. There is batt. voltage at the closed side of a normally open contactor. Could be a start or steer contactor. It has to close before power is applied to the other two, I'm guessing drive and lift contactor. I'll have to see if there is positive and negative applied to the coil with key on. I thought someone might give me a code definition to see if I am looking in the right direction. Back to basic's Thanks the reply
  • Posted 10 Dec 2015 08:40
  • Reply by Libbey
  • Texas, United States
Check all the contactors and the coils. check wires to contactors.
  • Posted 10 Dec 2015 04:31
  • Reply by Adams1
  • Indiana, United States

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