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2018 cub cadet challenger 750 over heats no one knows why


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I have a 2018 cub cadet challenger 750 I bought brand new almost 2 years ago the first month I had it the exhaust broke and burnt the spark plug wire in two that was a recall so the dealership installed the new one it had a different design and it bolted up to the bottom two plugs below the spark plug the dealership said they had to Adjust the exhaust valves I get the machine back thanking everything is good now wrong not even a week after I get it back the timing chain tensioner comes apart inside the motor I take it back to the dealership They put one on I get the machine back thanking everything is good but then just like before not even a week goes by when I was riding the Machine automatically quits going come to find out the wet clutch was burned up the primary clutch head stripped off of the splines I get that fixed and then  it overheats I take it back they bleed the air out of the coolant they bring it back to me the same day that I get it back it overheats again I take it back they temporarily fix it again just enough to let the warranty run out and now the machine has been to multiple different mechanics I have had them try to bleed the air out they have stood it up on its end I have had the water pump changed I have had the fan hooked to a switch so I could leave it on all the time but still almost 2 years later not even 200 hours on the machine and I cannot ride it The dealership will not take it back as a lemon I have tried I am at my wits end I have no clue what to try next

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  • 2 months later...
On 9/27/2021 at 7:50 PM, Jacob E freeman said:

I have a 2018 cub cadet challenger 750 I bought brand new almost 2 years ago the first month I had it the exhaust broke and burnt the spark plug wire in two that was a recall so the dealership installed the new one it had a different design and it bolted up to the bottom two plugs below the spark plug the dealership said they had to Adjust the exhaust valves I get the machine back thanking everything is good now wrong not even a week after I get it back the timing chain tensioner comes apart inside the motor I take it back to the dealership They put one on I get the machine back thanking everything is good but then just like before not even a week goes by when I was riding the Machine automatically quits going come to find out the wet clutch was burned up the primary clutch head stripped off of the splines I get that fixed and then  it overheats I take it back they bleed the air out of the coolant they bring it back to me the same day that I get it back it overheats again I take it back they temporarily fix it again just enough to let the warranty run out and now the machine has been to multiple different mechanics I have had them try to bleed the air out they have stood it up on its end I have had the water pump changed I have had the fan hooked to a switch so I could leave it on all the time but still almost 2 years later not even 200 hours on the machine and I cannot ride it The dealership will not take it back as a lemon I have tried I am at my wits end I have no clue what to try next

I’m having the same issue with a 2017 550.  It’s in the shop now awaiting a new head gasket (that’s somewhere in neverland) according to shipping info.  Also a new water pump is to be installed.  Mechanics have repeatedly bled the system but after a few hours it overheats.   It has something to do with blow back.  Once it begins to overheat, the radiator and overfill jug is filled to the brim.   One mechanic opened the radiator cap and was drenched in the pressurized fluid!   The saga will continue if I ever see the head gasket. 

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  • 4 months later...

I had the same problem. Shaved the head, new head gasket, new water pump. Nothing worked. I ended up just buying a new drop in motor. But as I thought about it, I never checked to see if the water pump was actually turning. I am guessing that the chain that drives the oil pump and water pump spun off. If I ever find the time I am going to disassemble the old motor and find out. 2018 750 challenger crew. 

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