Crown 20MT:
12v Charger or 24v Charger?

Just got in a 20MT Walkie Truck. 130" mast Semi-Industrial model with 4 brand new Crown batteries. Made 12/1996. Serial # 1A177967. The four 6v batteries are Crown # CR-235 batteries. And it is SLOW, very slow. Only the mast goes up/down at the normal speed. There is a definite "electrical" smell from the motor area. So maybe we have a nearly burned out motor.

But first, I'm not sure we're using the right charger on this. Called Crown Lift, and their tech guy wasn't 100% sure if it uses a 12v charger or a 24v charger. He said to reply on the local dealer. They think it should be a 12v charger. Thing is, the truck came with a 24v charger, which sure gets those batteries gassing good. But I don't want to fry anything or damage the new batteries. So trying a 30A 12V charger, and the truck is still slow.

I would like to know definitively if this machine should be using a 12v or a 24v charger. The 20MT has that "boosted" voltage system for high speed, where it switches from 12v to 24v at a certain range of the twist control.

But what is it wired to charge at? Being a semi-industrial model, it came from the factory as an External Charged truck. It came with a MAC Patriot 24v charger # 1240 Model. But the local Crown Lift guys are thinking I shouldn't use it.

Anybody can shed some definitive light on this?

Thanks, Max
  • Posted 18 Jun 2013 10:13
  • Modified 18 Jun 2013 10:14 by poster
  • Discussion started by Rockatansky
  • Ohio, United States
Showing items 1 - 8 of 8 results.
The only charger that I have used is 12v. This tool is DC 12v to AC 110v 400w power inverter from bestek. The way that I have acquired to use this tool is to connect with car cigarette lighter charger outlet. If you want to know more about its detail functions, you can search Bestekmall on Google to catch more information. Wish this point is helpful to you.
  • Posted 1 Jun 2017 11:49
  • Reply by aloce_j
  • Louisiana, United States
Get a 12v low amp charger, load test batteries, if they drop less than 4.5 volts under load, u/s. Test brake, door, sas or belly, bottom of mast switch, direction micro switches, and control wiring to the solenoids of contractors
  • Posted 3 Oct 2014 08:50
  • Reply by southernviking
  • South Island, New Zealand
As a crown tech I can tell you it should be a 12 volt charger I can also tell yo that the speed problem with these trucks tends to be a broken wire in the handle harness so the second speed contactor does not activate the 3rd speed contactor make sure the second speed contactor has the switch mounted to the top of it
  • Posted 1 Oct 2014 05:16
  • Reply by altech
  • Massachusetts, United States
crownie have similar machine and the travel motor has been removed by previous owner, can you help with wiring to get the motor back in place so we can test it (motor was tested previously and was OK) so I have been told
think charge issue on lower batteries as was working after battery replacement, but failed after a short while and was removed so unit could be moved manually

Gaz 0427242665
  • Posted 29 Sep 2014 21:35
  • Reply by gary_a
  • New South Wales, Australia
Hi Crownie.
I m trying to fix a crown model MT, serial 1A120250,
This machine comes to the shop dead. It has new automotive 12 volts (3 Pz) bateries.second contactor from the left is out of
the machine. Can some one help with wiring for this.
My email is in profile.
  • Posted 7 Nov 2013 07:32
  • Reply by pastrana_j
  • Puebla, Mexico
One other thing to inspect would be the Rabbit/Turtle switch and make sure it is functioning correctly.......
  • Posted 18 Jun 2013 20:22
  • Reply by kevin_t
  • Pennsylvania, United States
I Just worked on one of these a week ago installed new batteries and a couple bad Contactors and spent several hours replacing cables....this truck does have a 12 volt charger and the lift motor runs off 12 volts but the drive motor runs on both 12 and 24 volts(high speed)....first speed is 12 volts running thru a resistor then to the drive motor...second speed is 12 volts bypassing the resistor and high speed is when the two left most Contactors (b & c) close and put the batteries in series to give the motor 24 volts....the middle Contactor(A) should have a switch at the top of it that activates the coil for the C Contactor.....
  • Posted 18 Jun 2013 19:39
  • Reply by kevin_t
  • Pennsylvania, United States
standard charger for a stock 20m is 12v 25amp incredibly expensive
measure the voltage at the point the charger connects to
sounds like yours is not stock
do you have 5 contactors along top of "door"
slow drive is very common
open "door" jack the back of truck until drive wheel is clear of ground, bridge out door switch
drive truck at max speed and confirm if all 3 left side contactors close plus either forward or reverse
  • Posted 18 Jun 2013 16:30
  • Reply by crownie
  • Victoria, Australia

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