Cutting the wire is very concerning, because its likely over ridding either the temp sensor or it could be to allow the tractor to operate without triggering an "overheating " warning. Same for removing the thermostat as Flyweight mentioned, either to stop it getting hot or an attempt to allow it to build heat in the engine.
The best way to look up replacement parts is by using the actual Deere part number. Then use that number and look on alternative sites such as Flea Bay and Amazon, etc. I have purchased numerous parts on Non Deere sites using the Deere part number for cross reference and the tractors engine model number, as Flywheel Mentioned. When you source the parts carefully, they are usually exact fit and work just fine, for a fraction of the Deere price...
Here is the Deere site for parts, specifically for the 755. Save this link (copy it to your Bookmarks, etc.) for future use. Use this link to get the part numbers for your machine. Make sure to always double check you are selecting the correct application as the parts are listed for all of the models 655, 755, 756, 855, 856, so make sure to select the 755.....
This link opens the parts book for the 655, 755, 756, 855, 856,
so make sure you opening the correct machine for the specific parts you are searching.......
Note when you buy the water pump from Deere, you are getting all of the parts shown within the box number 26 in this illustration. You can purchase the individual parts which have an item number indicated, but often the cost is much higher for buying multiple parts and pieces, than the water pump itself complete...
Also, it's $163 retail from Deere and part number MIA880694.. This part substitutes for the EPC200687 part number shown on the previous page, it also replaces the AM878044 part number listed. That's why you ALWAYS need to "put it in your cart" on the Deere site, or click on any links for "parts updated information", to get the most recent part number.
Here is another source, using the Deere Part numbers....at the link below......
This one sells for $88 and change...double check to make sure its what you are looking for. All I did to find this was to take the correct part number and searched it in Google by inputting
John Deere MIA880694 water pump.
Numerous options appeared and this was just one of them,......since its from a "farm Parts" seller, its likely to be more accurate than some random listing on Amazon, Ebay, but you can always check.......
Buy Aftermarket for John Deere MIA880694 Water Pump Online and save. ✔ Largest Selection, ✔ Best Prices, 🚚 fast shipping available at farmpartsstore.com.
farmpartsstore.com
By the way, the thermostat gasket is part number
A-M805702 for $1.69 or part number
M805702 for $2.69 from Deere. The "A" simply designates alternative part source available.
The thermostat is either
CH15536 for the 150 degree thermostat
or
M811272 for the 180 degree thermostat. Either use the gasket listed above.
You will also probably want to replace the temp sending unit switch where the wire was cut.......Here are those numbers. CH15516 for the switch (sending unit) and CH13814 for the metal crush washer which it appears is used under the switch to prevent a leak......Prices are shown......
I would imagine the wire was cut to attempt to stop it from either sending the signal about the overheating, or perhaps it was impacting the PTO operation, if the switch indicates the engine is overheating, the PTO will shut off.
I hope that wasn't the case, that the prior owner simply cut the wire to stop the overheating signal from impacting the PTO operation, as that could mean there is a far more serious cause to the overheating and their attempt to "resolve it", so they could use the machine was to
1, - Remove the thermostat
2. - Cut the sending unit wire so it didn't shut down the PTO operation when the engine was overheating.
Make sure the coolant is flowing through the entire block and that the coolant is new, fresh and the right coolant for the machine. Make sure to check the radiator so the coolant is flowing properly and the temp being reduced. Use a Infrared Temp gun if you have one, to see the temp of the radiator at the top, middle, bottom, etc. as the coolant should cool as the coolant makes its way through the cooling system.........
My fear is the prior owner had trouble with the machine running hot and possibly stopping the PTO from operating, so the mower or whatever they were running on the PTO would shut down. They likely pulled the thermostat trying to solve the problem and when it didn't, they cut the wire to the sending unit switch. This is why I would use the infrared temp gun to check the cooling system to make sure its working.
You can even measure the surface temps of the upper and lower hoses to tell if the coolant flowing through the system is in fact, cooling down. If its not, you need to find why, which could be a plugged radiator, coolant air pocket in the block, obstruction in the cooling system from crud from years of use without service. It could be a number of things.....You will only know once you check surface temps and see how the system is functioning......
Make sure to let us know how this works out and if you need more help, just ask...........Welcome to GTT.......
