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Electric fork lift

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W.W.

02-24-2002 05:51:03




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I have a 24 volt fork lift. it has worked fine for years but now it moves with jerks. stop go, stop go with the speed control in any position. does any one know what could be wrong?




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W.W

02-26-2002 03:42:44




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 Re: electric fork lift in reply to W.W., 02-24-2002 05:51:03  

thanks to everyone. I will be checking these things tomorrow wed.



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John

02-25-2002 12:12:56




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 Re: electric fork lift in reply to W.W., 02-24-2002 05:51:03  
Check the brushes on the drive motor, they might not be making good contack. Move the speed control slowly, you should either hear a click as each speed engages or a hum as the pot increases. You might have a burned out speed resistor.



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Gary Sanders

02-25-2002 08:38:10




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 Re: electric fork lift in reply to W.W., 02-24-2002 05:51:03  
Sounds like you have a "pot" problem. Most older units use a potentiometer in the control circuit to vary the amount of current sent to the motor by the power circuit. The "pot" is usually connected mechanically to the accelerator pedal/speed controller mech. The "pot" in a DC system acts just like a dimmer switch(rheostat) in an AC light system. The more you turn it the more you vary the resistance. Resistance usually starts out high at the "neutral" position, so you go slow. The more you turn/rotate the controller, the more you lower the resistance and the faster you go.

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Franz

02-24-2002 23:01:22




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 Re: electric fork lift in reply to W.W., 02-24-2002 05:51:03  
If it uses a compressable carbon pile for speed control, look for a hydraulic system that compresses the pile, and check that system for proper operation.



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teadave

02-24-2002 21:05:08




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 Re: electric fork lift in reply to W.W., 02-24-2002 05:51:03  
had one do something similiar once. didn't want to move, or jerked when moving. tried everything,finally called repairman out. it took him about one minute to find the problem. low brake fluid. there was a switch to stop the thing from working if the fluid fell below a certain level. it worked for me!

teadave



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Greg D.

02-24-2002 19:23:04




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 Re: electric fork lift in reply to W.W., 02-24-2002 05:51:03  
I`m no ork lift expert but I would raise the whells off the ground and activate forward and check voltage at the connections to the motors and see if you are losing system power to cause the jerking problem. Could be the controller not maintaining power, if it has contacts they could be arcing and not maintaining a positive contact, or the motor itself could be your probem. Just my opinion of where to try and figure it out.

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