Drive Wheel Runs Sporadic - Technical Troubleshooting discussion in Forkliftaction's forums

Crown 20MT:
Drive Wheel Runs Sporadic

We have just purchase a Crown model 20Mt-S serial number 1A15911. looks like it has light use, but not maintained properly.
The drive wheel only runs sporadic, and only in the slow mode when it does run, you can hear the magnetic switches kick in but not the drive.
So far I have cleaned all the post, refilled and recharged the batteries, which were really low. Cables and batteries look new and cleaned the connection to the drive motor. I have started to clean the contacts on the magnetic switches and checked the safety switches.
Any other advice or problem areas I should be looking at? Also where can I find a wiring diagram and owners manual to download?
Once I get this running I will replace all the batteries, I don't want to put too much money in before I find out this is just an anchor

thanks in advance

Posted 13 Sep 2015 01:23
Discussion started by Bruce_N
Alberta, Canada

Post a Reply Report this post

Showing items 1 - 2 of 2 results.

Sort messages by:

Thanks for all your advice. I have been working on this machine off and on when I find time, so far no luck, everything looks good and clean, all the switches seem to working properly, I am now thinking the batteries are wired wrong, Now looking for a wiring diagram on the batteries.

Posted 29 Oct 2015 12:22
Reply by Bruce_N
Alberta, Canada

Post a Reply Report this post

these trucks use 2 each, 6 volt batteries to drive in slow, the put the other 2 6 volt batteries in series to get 24 volts for high speed.
If you wanted ME to start to try and fix this (not so young, and not so recent technology design*) truck, I would have you -start- by getting 4 known good 6 volt batteries.
also there is a resistor in this truck located behind the contactor panel's middle. you will want to check it. all the micro switches and contacts (and micro-switches on the contacts) would be the next step after the batteries.

* and there are plenty out there, still working away, that I wind up taking care of

My real suggestion would be to consider moving into this century, and consider a unit that will use less energy overall, one with transistors in the drive circuit. every brand has moved into this less expensive to own,use, produce technology and 'obsoleted' these older style units.

Posted 14 Sep 2015 00:19
Reply by edward_t
South Carolina, United States

"it's not rocket surgery"

Post a Reply Report this post

Having trouble using the Discussion Forums? Contact us for help.

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.