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Unread 03-02-2010, 07:24 PM   #1
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Default Old Resistor Cart

Not knowing really anything about resistor carts, I have a few questions. This is an old late 70s, early 80s resistor cart with the motor directly in front of the axle horizontally.

The cart is trashed, everything internal needs to be gutted. The guy wants to use the cart at a small airport to tow airplanes... it already had bigger tires (22") on the cart. To get the torque he wants, would it be wise to upgrade this to a controller cart and newer motor, do these older carts accept a standard late model series motor?
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Unread 03-02-2010, 07:39 PM   #2
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Default Re: Old Resistor Cart

Those old carts typically have differnt output shafts on those differentials and most late model motors will not bolt up, Usually its pretty pricy to upgrade to solid state, You will need a controller, pb6 or potentiometer, and many other small stuff that will add up to more than what the cart is probably worth.
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Unread 03-03-2010, 07:14 AM   #3
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Default Re: Old Resistor Cart

Is there a good description of how these old resistor carts function or can someone explain. First time I've ever had my hands on one.

I believe the solenoid is bad but when I jump the solenoid, and put the cart in either forward or reverse it comes to life without pressing the gas pedal or having he key turned on. Is this normal for a resistor cart?
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Unread 03-03-2010, 07:21 AM   #4
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Default Re: Old Resistor Cart

No.... likely your speed wiper arm is not coming back to zero. Or it has a problem
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Unread 03-03-2010, 07:23 AM   #5
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Default Re: Old Resistor Cart

Remove the solenoid jumper. Place the cart's rear end on jacks or blocks for safety...... and get 2 small jumper wires. Land a positive and a negative lead onto the 2 small terminals of the solenoid. It should give a click as it closes to complete the circuit. If not replace it.
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Unread 03-03-2010, 07:28 AM   #6
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Default Re: Old Resistor Cart

Quote:
Originally Posted by scottyb View Post
Remove the solenoid jumper. Place the cart's rear end on jacks or blocks for safety...... and get 2 small jumper wires. Land a positive and a negative lead onto the 2 small terminals of the solenoid. It should give a click as it closes to complete the circuit. If not replace it.
Agreed! Just haven't had time to get that far before work... This thing is quite unique, it's like the General Lee met an Airport Tug. I'll have to take pictures, has a lift on it and it's quite stout, hopefully I can get it running with out too much of a headache.

So Scotty, is there a good overview of how resistor carts function that you can point me to? Doesn't seem overly complicated at all.
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Unread 03-03-2010, 07:36 AM   #7
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Default Re: Old Resistor Cart

I will try to give it to you in a nutshell here. The application will differ from cart to cart but the theory is the same .... key switch powers the micros at the F&R. The micro activates the solenoid which brings power to the speed wiper board assembly. The speed wiper selects a cable depending upon peddle position. Each of these cables runs to a different speed resistor . Each resistor has a graduated resistance value which regulates how much amperage is allowed to flow to the motor ...the motor goes faster the more amperage it is allowed to draw.
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Unread 03-03-2010, 07:39 AM   #8
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Default Re: Old Resistor Cart

OHhhhhhh resistor cart Hold on and refresh in a minute or two ... I will edit for resistor
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Unread 03-03-2010, 07:44 AM   #9
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Default Re: Old Resistor Cart

I am done editing......What make cart are we talking about?
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Unread 03-03-2010, 08:02 AM   #10
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Default Re: Old Resistor Cart

Thanks for that. Looks to be a late 70's cart according the diagrams. Here are two really bad cell phone pics, I'll get better ones later.
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