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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

1750 Overheats

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05-21-2020 19:42:15

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Our 1750 Cockshutt has started to overheat and push steam out the radiator cap. I can see water in the radiator but it is not rolling. So I am thinking air pocket, bad water pump, or plugged radiator.

After the tractor got hot and steamed out the cap, I shut the tractor off and checked for heat. Motor is hot, hose for pump is hot, hose to bottom of radiator is not hot, bottom half or radiator is also not hot.
Could an air pocket cause these symptoms? I replaced the water pump last fall and the tractor had no indication of heat issues. Tractor does not get used from late fall to early spring. Up to now it has been used for light work without any indication of a problem. Now that I started working harder it has started to overheat.

How can I test if the water pump is working?

Thanks for your thoughts.

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05-23-2020 14:36:58

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  

Yes when pump was replaced I did rub pressure thru block and radiator. Water was discolored at first but ran clear after minute or two.

That I can stop the flow with almost no pressure says something. If I remove my hand then water come out until radiator is empty. But flow is not strong. Just full size of connector.

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05-23-2020 10:47:41

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  
Did you flush the block and the radiator when you replaced the pump? If you didn't make sure you pull the plug on the back of the block and stick on a hose with good pressure. Everything loves to settle back there. If you didn't do it, I'd just pull the hoses, pump, thermostat, etc., and start over by flushing the block and radiator. At least that will ensure every thing is crud free.

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05-23-2020 10:07:39

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  

Checked thermostat and it is working. While apart with w

ater in pump started tractor. With .my hand over outlet I could stop the water from the pump. Very little pressure felt. Bad pump?

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05-23-2020 05:20:20

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  
Should be just the opposite. Pumps up through the top hose down through the radiator through the bottom hose through the motor and repete.

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05-22-2020 19:57:56

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  

Finally had time to work on the tractor. Symptoms have changed a little. Bottom hose now has heat and bottom of radiator is same temperature as top. Very top and very bottom of radiator is hot middle is luke warm.

I can now see the fluid in the radiator moving slowly. Like being on a very casual walk.

Am I right is assuming water pump pulls water from top hose, pushes it thru the block and returns is via the bottom hose?

Thanks for the thoughts.

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05-22-2020 08:48:35

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  
the impeller might have broke as that's what happened to my 2-85 tractor this winter. bottom hose cold top hot. if it happened all of a sudden then that's what it is. the rebuilt's have a plastic impeller and split on the shaft . pull the thermostats and check for circulation.

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05-22-2020 06:00:57

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  

Thanks for the thoughts and ideas. I will see what I can find out today.

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Mitch Poindexter

05-22-2020 05:15:57

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  
Based on your description it seems like your radiator is plugged. If your water pump is good and your thermostat is good, then you might consider cleaning it in place before you go to the effort of pulling it out. Same concept as cleaning a house water heater using vinegar. Drain radiator (engine will still be full), add 1 gallon of vinegar, fill radiator with water. Run tractor hard for an hour. Drain radiator, water coming out will be an awful brown color, refill with water only (engine will still be full), run hard for another hour. Rinse and repeat until the water coming out is reasonably clean. Refill with antifreeze.
We ve had good luck with this process when our only other alternative is pulling the radiator. If the radiator has had multiple bottles of stop leak added over the years, you may find the old leaks. Don t leave the high concentration vinegar in the radiator for a long period of time, there s a reason why it s doing it s job and you only want it to do it s job and nothing extra.

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05-22-2020 03:25:53

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  
If it's not the thermostat, it's likely a plugged radiator. I had to have the one on my 2-105 and my 4040 Deere re cored because they were plugged. The one on my 2-135 was to, but I didn't have time to get that one re cored so I put a new one on it. The one on my 1550 got plugged up. I replaced that one with a better one off a 1600 parts tractor.

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Traditional Farmer

05-22-2020 02:54:36

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  
I had about the same symptoms with both my 1550 diesel and 1650 diesel,1550 had a clogged radiator,1650 had a cracked head.

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05-21-2020 23:01:48

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  
Doubtful. Removing the thermostat and ensuring the rad is clean is the easy way to check if the pump is working. Bad thermostat, pump, even slipping belts (but seems doubtful from your description). Rad could be blocked, even just the rad cap faulty. We can’t see from here.🙂

In ‘ye olde days’ when people drained their tractor cooling systems overnight, in frosty weather, and refilled with ‘less than soft’ water, the block could slowly silt up - I have knocked out liners which have left ‘a cylinder of lime sediments’ at the rear of the block, before now.

Start at the cheap/easy options and you will pinpoint the problem at minimal cost/effort. Worst fear is gasket problems but this seems a minor problem, but clearly needs sorting. Not all replacement pumps are as reliable as back in the previous century, sadly.☹️

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alberta dave

05-21-2020 22:17:55

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 Re: 1750 Overheats in reply to pcrh, 05-21-2020 19:42:15  
Sounds like a bad thermostat. Remove it and try running the tractor without it. If temp stays down that's the problem. I try to change the rad cap at the same time as the thermostat for the few extra bucks. I have run all summer without the thermostat. Not so good in the winter.

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