Crown RR5220-45:
Drive motor shaking

Have an 03 crown RR5200 1A282730 Freezer reach. DC drive motor. The motor shakes and almost binds when moving slow or calling for little acceleration. Move fine forward or reverse under moderate or heavy acceleration or plugging. Drive unit 7 months old. Replace motor pedestal wich have a broken bolt. 3 drive motors a new encoder. Known good Access 3. New battery. Even removed the brake and tested. This motor takes a fit at any speed if trying to maintain a speed.
  • Posted 16 Jan 2021 07:23
  • Modified 16 Jan 2021 07:56 by poster
  • Discussion started by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe
Showing items 1 - 15 of 16 results.
A new undercarriage is on order. When checking for the drive unit being centered I found it eas tilted slightly favoring the back.
  • Posted 29 Jan 2021 01:39
  • Reply by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe
I had a customer a few years back had a lot of problems with the lower bearing cap that holds the drive unit to the undercarriage. The 5 allen socket head bolts were loosening and breaking off. Sounds like you are having the same problem, but the armature hitting in the motor sounds like a bearing problem in the motor. Good luck with this one
  • Posted 29 Jan 2021 01:11
  • Reply by KOBrien
  • Texas, United States
kwelectronics1@gmail.com
Just gotthe drive unit out the small shims show signs on movement dowel pins look good the threaded top is broken off one. Still do no see enough movement to force the armature to hit. The do not hit when spinning on the floor. Odd
  • Posted 22 Jan 2021 02:12
  • Reply by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe
Mine usually cracked from center of motor mount to steer motor and down the back of the carriage. Had one crack below the grease zerk to the front of the carriage. On the second one the drive unit would shift enough to let the tire hit the back of the battery box
  • Posted 22 Jan 2021 01:59
  • Reply by JMC1
  • Iowa, United States
I have the motor back out looking for cracks. Will they be visible. Sounds dumb I know.
  • Posted 21 Jan 2021 23:50
  • Reply by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe
the motor only has an upper bearing. I have heard and seen the cracked undercarriage bulletin. does the carriage crack in the same spot every time.
  • Posted 21 Jan 2021 10:55
  • Reply by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe
Do they crack in the same place?
  • Posted 21 Jan 2021 06:37
  • Reply by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe
Might check for a cracked drive carriage. I've had these crack and the drive unit can shift up far enough to hit the frame. Inspected all of my RD5200s, and had 4 of them with cracks in them out of 27.
  • Posted 21 Jan 2021 06:33
  • Reply by JMC1
  • Iowa, United States
The matching issue i agree. Should learn more once a pull the motor.
  • Posted 21 Jan 2021 02:23
  • Reply by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe
The armature bearings hold the armature dead-center of the motor if the bearings are good and correct. Sounds like a problem with the motor for sure. I don't recall ever having to shim a motor on a Crown RR. I suggest getting a new or rebuilt motor from Crown
  • Posted 21 Jan 2021 02:15
  • Reply by KOBrien
  • Texas, United States
kwelectronics1@gmail.com
If the armature is hitting the field frames there is obviously a bearing problem in the motor, and also the drive unit. Very strange problem. Maybe the motor and drive unit aren't matched correctly.
  • Posted 21 Jan 2021 01:52
  • Modified 21 Jan 2021 01:58 by poster
  • Reply by KOBrien
  • Texas, United States
kwelectronics1@gmail.com
The motor rebuilder said the fan would hit before the armature. I am wondering avmbout a shimming issue.
  • Posted 21 Jan 2021 01:23
  • Reply by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe
Them motor does not bing at all free wheeling. I am going to pull the motor again and triple check the drive unit bearing. I did switch the pedestal from a doner truck. Crown stats they have had no issues with there rebuild 36volt drive units. Which this is.
  • Posted 21 Jan 2021 01:20
  • Reply by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe
Oh, I see. Sounds like it's just time to buy a lot of new parts - Good luck!
  • Posted 21 Jan 2021 01:14
  • Modified 21 Jan 2021 01:19 by poster
  • Reply by KOBrien
  • Texas, United States
kwelectronics1@gmail.com
Ok the shaking is the armature hitting the fields. It causes the motor to go crazy. The motor is not lined up with the drive unit. I tried actually tilting the motor pedestal and the motor quiets down. I shimmed it in that position in desperation. It lasted 2 hours and started rubbing again. I loosened the drive unit bolts and checked the dowel pins and the suffrage for cracks.
  • Posted 21 Jan 2021 01:05
  • Reply by ifsmike
  • Massachusetts, United States
when all else fails ,stand back and observe

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