Crown RC3000:
No travel forward/reverse left side motor

Right side works normal. Contacts energizes for both motors when traveling in either direction. Swapped contactors around to eliminate a contractor issue. Also replaced left side motor. Seems as the steering switch is working as it cuts the right side motor out when steering in one direction. Contact for left side energizes but still no travel. Could this be a rec issue or something else?
  • Posted 8 Jun 2017 12:21
  • Discussion started by b_d26
  • Georgia, United States
Showing items 1 - 14 of 14 results.
Found my problem with the motor. Brushes where stuck. Cleaned everything up installed new brushes and test on bench and ran fine.
  • Posted 2 Jul 2021 06:25
  • Reply by jordan_a
  • Missouri, United States
Thanks garland_s I am going to remove it in the morning and check it out on the bench.

Thanks
  • Posted 30 Jun 2021 05:36
  • Reply by jordan_a
  • Missouri, United States
Sounds like that's what's happen, I always test them with a battery charger on the table before I install them. You can test it while it's in but I have a feeling it's the motor
  • Posted 30 Jun 2021 05:14
  • Reply by garland_s
  • Tennessee, United States
Volt meter leads on A2 and D2 get like 30v going forward and in reverse.
Just ran more voltage test with A2 as my common.
A2-A1 36 volts
A2-D1 36 volts
A2-D2 36 volts
I am now thinking I have a bad motor?
  • Posted 30 Jun 2021 00:30
  • Modified 30 Jun 2021 03:40 by poster
  • Reply by jordan_a
  • Missouri, United States
Are you using the cable on the motor as your ground when you get your voltage reading or ground lead from battery? Could possibly be a problem on the ground side.
  • Posted 29 Jun 2021 23:58
  • Reply by garland_s
  • Tennessee, United States
Motor does spin by hand with the brake off.
  • Posted 29 Jun 2021 21:34
  • Reply by jordan_a
  • Missouri, United States
Does da motor try to spin, can you spin it by hand?
  • Posted 29 Jun 2021 07:21
  • Reply by marcos_m
  • California, United States
I did remove the fuses tested them. I have it blocked up getting voltage to both motors. Check A1 and D1 on right motor and A2 and D2 on left and get the same voltage. Not sure what the A2 and D2 are on the right motor.
  • Posted 29 Jun 2021 05:51
  • Reply by jordan_a
  • Missouri, United States
I have seen the fuses for these thing check good but actually be bad. Make sure to remove it when you check it. I got in the habit of wiggling the brass on both sides to make sure there's a good connection. You can also check voltage at the motor if you have it blocked up. Make sure the cables aren't crossed, it's easy to do.
Came back to edit. Saw that you check voltage at the motor and they were same as other side. Sounds like motors bad, but you replaced it. Not often you get a bad one. You can run the motor off of a battery charger if you wanted to make sure all is good.
  • Posted 29 Jun 2021 05:42
  • Modified 29 Jun 2021 05:50 by poster
  • Reply by garland_s
  • Tennessee, United States
This is hard to do without being there but let's try. Does the left drive motor run? Did you take the power fuse for the motor not running out of the circuit when you checked it or swapped with the one from the other side? If the motor will not turn with the brakes released you have another problem other than the SCR drive system.
  • Posted 29 Jun 2021 05:04
  • Reply by 1Crusader
  • California, United States
I didn't do it, nobody saw me and You can't prove a thing...
Thanks 1Crusader
I have check all fuses, the switches, new brushes and checked the contactor. I am getting the same voltage on motor terminals A1 and D1 on right motor and the same on A2 and D2 on the left motor. Right motor will turn free with someone standing of the break release. I sure what the A2 and D2 on right motor are for?
  • Posted 29 Jun 2021 04:49
  • Reply by jordan_a
  • Missouri, United States
If your Left drive motor runs and steering is in the straight forward position and you have contactor pick up for the right drive motor then you could have either a blown power fuse for the right drive motor or a problem with the contactor for that side. In that contactor check the tips of the non energized side as well. Also make sure your drive motor brushes are in good shape ie not frozen in holders.
Good luck
  • Posted 29 Jun 2021 04:34
  • Reply by 1Crusader
  • California, United States
I didn't do it, nobody saw me and You can't prove a thing...
I am having the same problem with the right motor. Both contactors kick in and voltage to terminal A1 and D1 but motor will not turn.
  • Posted 29 Jun 2021 02:47
  • Reply by jordan_a
  • Missouri, United States
No, Not an SCR problem if the right side is working. If the contactor picks up for the left side and you have no travel I would be looking for a problem in the power circuit like traction fuse or brushes. With the truck blocked up off the floor you could push in a directional contactor for that side in question and then the 1A contactor, that motor should run or you have an open circuit on that side, like a power fuse or motor brushes.
  • Posted 9 Jun 2017 06:48
  • Reply by 1Crusader
  • California, United States
I didn't do it, nobody saw me and You can't prove a thing...

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