Cat Lift Trucks (& Caterpillar) NRR40:
Forklift Error Code 44

I am getting Forklift error 44 on my NN 40. Does anyone know the cause and possible fixes?
  • Posted 20 Dec 2021 11:34
  • Discussion started by vsaks
  • California, United States
Showing items 1 - 6 of 6 results.
Check battery voltage (37.5-38v), inspect PC contactor for defects or binding, clean with contact cleaner. Troubleshoot using O00 and A00 tests in the maintenance menu. Swap coil drivers to identify faulty one. PC contactor is top right corner on the panel.
  • Posted 15 Dec 2023 17:29
  • Reply by Jason_Miller
  • Victoria, Australia
if you are constantly having to recalibrate the joystick then it has a bad pot in it.
you can replace it, or just get a reman joystick. That should solve that problem.
the code 44 problem can be a bear to track down, i would attempt to do more circuit checks before i went throwing parts at it.
as for the code 84? that is the sensor on the drive unit (the pot on the top with the little cog belt). If the brake is not holding good enough when you start up it will throw that code. During the startup test the system will jog the drive motor to test the brake, if it moves that triggers that code. Check the belt, make sure it is tight, check the gears on the sensor, the set screws might be loose. And make sure the brake is set and not loose when applied. You can adjust it and tighten it up a bit so it will hold better. Just make sure after you adjust it that it is not dragging, when it releases it should freewheel with no drag.
  • Posted 25 Mar 2023 08:07
  • Modified 25 Mar 2023 08:08 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
Thanks Swoop223,

I have done all the steps to check the contactors as well as swapping the coils around they are all healthy and in the end the only way that I could get the unit up and running was do to a relearning on the drive forward and reverse and it would work for the few hours and after that again I was getting the code 44 and also another code 84!

After the codes, all I can do with the unit is only drive forward and reverse and lift up and the rest does not function not even lift down!

Should I replace the backplane board #101-1414B or is there anything else that I should check before that?
  • Posted 25 Mar 2023 07:31
  • Reply by Mark_PM
  • Ontario, Canada
yes it is the same
  • Posted 20 Mar 2023 22:07
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
Hi Swoop I have a Cat NRD30 with code 44 do you know by any chance how can I fix it? Does the same solution as the Cat NRR40 Applies to this one as well?
  • Posted 18 Mar 2023 01:04
  • Reply by Mark_PM
  • Ontario, Canada
Hello again vsaks :oD
code 44 eh?
well first off i would check the battery voltage and make sure it is charged up full.
36v battery i presume? it should be reading about 37.5 to 38v (if new it will be higher). You can check each cell and they should be close to 2.14v at 100% charge with no more than a 0.02v variance between cells.
as for the code the troubleshooting code chart says:
PC Contactor detected closed when it should be open.
Possible Causes:
1-Defective PC coil driver
2-Welded PC contactor tips
3-Binding contactor plunger
4-Defective return spring
5-Bad contactor panel harness
6-The Vehicle Manager may be bad
7-The PC Sense circuit may be defective
8-The PC Sense line (JPF2-9) may be shorted to B+
9-Circuitry related to the PC Sense line on either the Power Panel Driver Assembly, distribution board, or the VFC may be bad.

I would check that contactor real good and make sure the tips are good, not welded and make sure the movable part is not worn and binding up. You can clean it up with some contact cleaner and blow it off dry, dirt can cause binding.
One way to check the wiring circuit is to run tests:
O00 and A00. Those are in the maintenance menu section after you access the onboard VCM.
The coil drivers are on a small circuit board on top of the control panel area behind the cover on the RH side of the operator compartment where the contactors and VCM are. They are all identical so you can swap them around to see if the problem moves to another code, if it does then one of those driver modules is bad. That's actually what the tblshooting manual says to do haha.

The PC contactor is the one on the top right corner of the panel just to the right of the large main fuses.
  • Posted 20 Dec 2021 18:08
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!

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