Crown SC4000:
No top speed

Hey all, got a sc4000 here and in forward and reverse it moves but not at full speed. I'm just a maintenance supervisor here at my company so I'm not forklift mechanic I just try to fix what I can.

No codes on the display, so far ive measured battery volts at the battery and have 36V and I'v disconnected the hight limiti switch which didn't effect the problem. What can I look for to fix this thing.

Thanks
Cole
  • Posted 23 Jul 2011 02:01
  • Discussion started by boaty
  • Illinois, United States
Showing items 1 - 3 of 3 results.
That switch is simple. Two conductors. Follow the cable down the lift cyl and find the plug, make sure it's fully seated and not damaged. Check operation of the switch with ohm meter. The switch is adjustable and can sometimes loosen up and not be engaged by the mast. It's either closed or open. The truck should slow way down with mast above free lift. The speed that the truck travels above free lift can be adjusted with a handset.
  • Posted 20 Jan 2022 13:48
  • Reply by 1CrownTech
  • Washington, United States
If naval aviation were easy, we'd let the Air Force do it!
1crowntechnician@gmail.com
Got the exact same problem. While driving and raising the mast is will slow to a crawl when it hit the height switch.
  • Posted 13 Jan 2022 06:19
  • Reply by jordan_a
  • Missouri, United States
one of the first thing I would do would be to reconnect the height limit switch and check the wiring and operation of that switch. I don't know how it was designed in your unit, but if I was designing that circuit, I would have "failed open circuit" switch and wire to be the safer default of not going fast if failed open, rather than slowing down ONLY when switch and circuit are closed.
  • Posted 23 Jul 2011 21:38
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"

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