05-08-2021, 07:52 PM | #1 |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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MCOR-4 Continued
A brief introduction to this post from a previous thread:
https://buggiesgonewild.com/showthread.php?t=136148 I have had three "OEM - ITW Switches - Made in Mexico" MCOR4's on my cart in three years. These are shown below. The first failed in 6 months or so. The second lasted a year or so. The third lasted another year. So for $90 to 100.00 a pop, they all failed in a year or less. The way they failed was similar. Early on they would not give smooth operation throughout the range. There seemed to be dead spots. Later, they all needed the dreaded "pump the pedal 30 times each time you go to ride". That got old real fast. In July, 2020, the third became undriveable. I looked for options online and decided to choose the cheapest one available, somewhat as a test. The one I got, also shown below, had me a bit worried as the photo showed "MCRO 4", and made in China! But for $38.00, I decided to go for it. I installed it on August 1, 2020. I've waited 9 months before reviewing it here. Mostly because everyone says to get the Mexico ones only and not the China ones. However, the one I got might just be the rare perfect one? Maybe, but.... There have been zero dead spots, and I've never had to pump the pedal, yet! I swear it has the smoothest operation consistently of all 4. And with the lockdowns, I've been driving this a lot more than the first 3. Usually 5 to 18 miles everyday, rain or shine. I'll update this as time progresses. But for 1/3 the cost, and equal longevity I feel I'm way ahead of the game with this one. |
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05-08-2021, 09:42 PM | #2 | |
Gone Wild
Join Date: Apr 2020
Location: 1000 Oaks, SOCAL
Posts: 424
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Re: MCOR-4 Continued
Quote:
The input to the MCOR position sensor comes from the controller and the controller responds to the return. There might be a difference between controllers in the circuits. We got our 2003 last year and the MCOR looks original, but don't know for sure. It has one or two spots where the speed jumps more than it seems it should. We don't get much humidity here in SoCal which may make a difference in corrosion on the wiper. |
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05-08-2021, 10:02 PM | #3 | |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: MCOR-4 Continued
Quote:
I have read resistance of 30 to 50 ohms on the closed micro switches. This may cause enough voltage drop to cause the controller to cut in and out since it doesn't get the full 48 volts to pin 6. I'm not sure. Pumping the go pedal cycles the switch enough times to confirm a 0 ohm contact. Of course humidity could affect things. We have plenty of that here! |
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05-08-2021, 10:55 PM | #4 |
Gone Wild
Join Date: Apr 2020
Location: 1000 Oaks, SOCAL
Posts: 424
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Re: MCOR-4 Continued
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05-09-2021, 01:12 PM | #5 | |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
|
Re: MCOR-4 Continued
Quote:
When I took it apart, the switch started closing properly. I think tapping the case to open it may have improved the contact. I reassembled it but already had #2 installed which worked fine for several months. When I get the initiative to do so, I will open # 2 or 3 and check the switch replacement. It appears easy to do. Right now the switches close to 0 ohms but in the cart it was 20-50 ohms erratically. Like I mentioned, I really think the switch is the problem with these. The China ones may use a different switch than the Mexico ones. Time will tell if I am correct in this assumption. |
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05-09-2021, 02:15 PM | #6 | |
Gone Wild
Join Date: Apr 2020
Location: 1000 Oaks, SOCAL
Posts: 424
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Re: MCOR-4 Continued
Quote:
I wrote a note on my Alltrax Wiring Diagram that the 5 inputs needed for the controller to close the solenoid must be >30V, not sure where I got that. The stock MCOR4 switch is rated for 5A @ 28VDC. The 16-4044 is rated for 10A @ 28VDC and has silver contacts. Wonder what the stock switch contacts are made of? |
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05-09-2021, 05:33 PM | #7 | |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: MCOR-4 Continued
Quote:
With the switch resistance of 30 ohms, the contact would generate 1.6 amps of heat across it. But what would that heat generated do to the contact life. I just don't know. BTW, in another post Sergio located the replacement switch since the original is OEM only made for MCORs. The replacement is ITW 16-304. https://www.newark.com/itw-switches/...t-10/dp/23F182 I may check into this in the near future and try to modify one of mine. I'll start another thread if I do. But at $20 each plus shipping, I'm better off getting the MCOR for $38 that I am having good luck with. |
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05-09-2021, 11:23 PM | #8 | |
Gone Wild
Join Date: Apr 2020
Location: 1000 Oaks, SOCAL
Posts: 424
|
Re: MCOR-4 Continued
Quote:
Will that switch work with the contacts coming out the back side of the housing? |
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05-10-2021, 08:26 AM | #9 |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: MCOR-4 Continued
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