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Curtis B.
Curtis B., Other
Category: Electric Vehicles
Satisfied Customers: 27787
Experience:  Worked on fleet of various electric vehicles, golf carts, scissor lifts and electric booms.
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Cart will not go. There is a squealing/whining noise coming

Customer Question

Cart will not go. There is a squealing/whining noise coming from the motor/gear box. If you push it and hold the power pedal down it will assist you to move it but it will not move own its own. If it's facing down hill it will move a little. New batteries in place was working when I loaded it on the trailer but went to unload it this was the problem that appeared.
JA: Where exactly do you think the noise is coming from? And how long has this been going on?
Customer: I think it's coming from the motor where it attaches to the gear box
JA: What is the model/year of your electric?
Customer: Have no idea
JA: What year is your electric?
Customer: Have no idea. Just bought it today from a guy. Drove it around and it was fine. Loaded it on the trailer and hauled it 2 1/2 hours and now this is what's going on
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I want to fix it myself. I checked the sylinoid, the batteries, the ignition, the pedal
JA: Anything else you think the mechanic should know?
Customer: The guy said he had just replaced the motor. The motor looks refurbished but not in bad condition
Submitted: 10 months ago.
Category: Electric Vehicles
Expert:  Curtis B. replied 10 months ago.

Noise from motor area! I would remove the motor and check the coupler between motor and gearbox. It is a splined shaft and splines may be worn and slipping!

Customer: replied 10 months ago.
Ok. I'll do that this evening when I get home from work. What do I do if that is the case?
Expert:  Curtis B. replied 10 months ago.

Replace the damaged parts, hopefully just the coupler!

Customer: replied 10 months ago.
I attempted to separate the motor from the gearbox but it seems like it's either got some kind of JB Weld or some kind of adhesive material that is locking them together. My husband is of the mindset that he thinks that one of the wires is overheating, one of the wires does get very very hot so let me see if I can give a clear explanation of what is going on. When you first push the gas pedal you can go in reverse for a very short period and then it stops it just will not go anywhere any further and at that point it's not doing any squealing in the motor but if you really push down on the gas pedal and keep it pushed that is when the motor starts squealing
Expert:  Curtis B. replied 10 months ago.

Drive motor may be damaged, or has a bad bearing in the closed end. It has to be separated or the motor has to be disassembled on the unit! The coupler is splined on both ends, but it can get rusted into place and take some effort to free it up!

Expert:  Curtis B. replied 10 months ago.

Sounds to be drive motor problem to me!

Customer: replied 10 months ago.
Got the motor off the gear box and all the "teeth" are good on the motor and the gear box. When my husband pushed the "gas" pedal the motor does nothing
Customer: replied 10 months ago.
How do I check to see if the motor is good?
Expert:  Curtis B. replied 10 months ago.

Motor would need to be removed, and stood up on the end, and spin the armature manually and feel for roughness or listen for noise. Looking for bad bearing or bad brushes, and of course looking at the motor spline. If I have motor off, I would check the brushes and replace brushes and end bearing , just to know they are both new.

Customer: replied 10 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer: replied 10 months ago.
Splines look fine. No noise when spinning. How do I check the bearings and brushes? Do I need to take the motor out of its case?
Expert:  Curtis B. replied 10 months ago.

Yes, might as well disassemble the motor!

Customer: replied 10 months ago.
Ok. So we just jumped the motor and it spins quiet and fast so no problem with it. The motor does look brand new also.
Expert:  Curtis B. replied 10 months ago.

Ok, time to raise the rear wheels and turn the gear box side!

Customer: replied 10 months ago.
When we turn the tires it turns the spline turns. When we turn the spline the tires turn. My husband is concerned that he can hold the spline still and still rotate the tire.
Expert:  Curtis B. replied 10 months ago.

With both tires off the ground, if he turns one , the other should turn in opposite direction. That would be normal. To keep tire from rotating, one tire would have to be on the ground, or blocked.

Customer: replied 10 months ago.
that is what is happening. What do we do next
Customer: replied 10 months ago.
He is worried that the he can turn the tire even when he is holding the spline still.
Expert:  Curtis B. replied 10 months ago.

Is one tire on the ground?

Customer: replied 10 months ago.
No. We can put one on the ground though
Expert:  Curtis B. replied 10 months ago.

Yes, do that and try it.

Customer: replied 10 months ago.
Ok. Now he spins the tire he can not stop the spline from spinning
Expert:  Curtis B. replied 10 months ago.

All sounds normal! Swap tires and try the other wheel.

Customer: replied 10 months ago.
Same thing with this side so all good
Expert:  Curtis B. replied 10 months ago.

So question is still , where is the noise coming from.???

Customer: replied 10 months ago.
It only made that noise the one time. Since then it hasn't made that noise
Expert:  Curtis B. replied 10 months ago.

I thought it was a continuous noise!

Expert:  Curtis B. replied 10 months ago.

You didn't hear any noise at either wheel, think that maybe the brake was making noise.?

Customer: replied 10 months ago.
My husband said he thought it must have been an "electrical" noise. No the brakes are not working so I don't think they where making the noise. When we push the go pedal it will try to go but it does nothing more than a little scoot. All 6 batteries are brand new Trojan
Expert:  Curtis B. replied 10 months ago.

With cart off the ground and motor reinstalled. see if both wheels will drive on the one wheel down test. Test one side, then the other.

Customer: replied 10 months ago.
Did each side and the motor/gears spin/wheels spin
Customer: replied 10 months ago.
My husband just jacked up the back wheels and pressed the pedal and it goes great in reverse and forward. I mean it's really spinning fast
Expert:  Curtis B. replied 10 months ago.

My thought was that it may have axle shaft spining in the drive hub on one of the wheels. sounds like it should run on the ground!

Customer: replied 10 months ago.
That's what we thought! Any other ideas? What is the black box that is next to the solenoid?
Customer: replied 10 months ago.
It like its not getting enough juice. We just checked all the batteries and they all read between 6.34v to 6.37v
Customer: replied 10 months ago.
We have one wire that is getting very hot (we changed it out and thought that would fix it) it runs from m- on the black box the the bottom post on the controller
Customer: replied 10 months ago.
With the wheels off the ground and the pedal depressed it spins the wheels fast and the WIRE DOEA NOT GET HOT! What is the world is going on?!
Customer: replied 10 months ago.
Used a voltmeter to check the bold on the black box. The 4 post read between 17-19v
Expert:  Curtis B. replied 10 months ago.

lets back up a little, what year model is this cart? I have been thinking this is late model with a Curtis controller. Sounds like you are describing a resistor cart. With resistors in a box . Year model is on plate on the passenger side glove box area, It will be letter /number combination, and the last two numbers should be year model. Example F091 would be 1991 model.

Expert:  Curtis B. replied 10 months ago.

Like the one above.

Customer: replied 10 months ago.
The plate has been removed but we think it's between a 91 & 94. The guy we bought it from didn't know
Expert:  Curtis B. replied 10 months ago.

Is speed control mechanical or electronic? Does this black box have four main battery cable connections? Pictures maybe?

Expert:  Curtis B. replied 10 months ago.

Did you look at the link i sent on the resistor control unit?

Customer: replied 10 months ago.
It doesn't look like the picture you sent.
Expert:  Curtis B. replied 10 months ago.

Electronic Curtis controller. B + on the controller should have 36 volts , you say somewhere around 17 to 19? B+ comes direct from the solenoid , which has to be 36 volts. We may be getting closer to he problem. What is voltage at the solenoid cable terminals. both sides should be close to 36 volts,

Customer: replied 10 months ago.
20.4 & -20.3
Customer: replied 10 months ago.
B+ is 20.1
Expert:  Curtis B. replied 10 months ago.

Follow cables back and find why there is only 20 volts, when solenoid has to have 36 volts, and controller has to have 36 volts!

Expert:  Curtis B. replied 10 months ago.

The positive cable from the battery pack goes to one side of the solenoid. So it has to be 36 volts, or the battery pack is hooked up wrong!

Customer: replied 10 months ago.
Ok got 39 volts to hot on selenoid but nothing on back side turned key on pressed pedal got 37 out the back side
Expert:  Curtis B. replied 10 months ago.

So do you get this to the controller?

Customer: replied 10 months ago.
With using B- as the ground with the key on and the pedal pressed getting 38v on all post on controller
Expert:  Curtis B. replied 10 months ago.

OK, now, is it getting to the drive motor?

Customer: replied 10 months ago.
Checked all 4 post on the motor and they are all 36v
Expert:  Curtis B. replied 10 months ago.

so cart should be driving! So with that said, what does it do now, does it lurch when pedal is pressed or??

Customer: replied 10 months ago.
It's a small lurch. Sometimes it actually rolls a couple feet, albite weakly.
Expert:  Curtis B. replied 10 months ago.

Des battery pack voltage drop when it trys?

Expert:  Curtis B. replied 10 months ago.

an axle shaft is not spinning in one of the wheels? Keeping unit from driving?

Expert:  Curtis B. replied 10 months ago.

Here is site showing the Ezgo troubleshooting, just scroll down the opening page past all the manual lists, which don't work , till you get to the troubleshooting guide. I have to get off here and go to bed! I will check back in the AM.