Why is getting hot after changing water pump - Bobcat 2010 3400 4x4

Are you sure the water pump has failed? Read this: sporadic heat spikes, no visual movement of water in radiator, no fan running, overheating light on and off

These are just a few, but they all boil down to no water movement, like a thermostat or water pump failure. Of course there is also the possibility of a bad thermostat switch (bottom of radiator), bad thermostat even a bad overheating switch (back of rear cylinder near water inlet.)

You can check the fan switch (bottom of radiator) by noting that it just give the fan a ground when it switches. So disconnect the line from the fan to the thermostat switch and ground it (the fan line), the fan should turn on. Thermostat can be placed in a pan with water and heated to ensure it opens. The other switches are checked by ohm meter since they close when it's overheated.

We replaced most of these parts also. Further investigation shows that we were not getting water flow. The thermostat has a hole in it for relieving the system of air. The air can cause the pump not to work and no water flow. So we found that the thermostat was put in upside down so the hole with the partial rivet was at the bottom. Drill a hole in the top of the thermostat, 1/8 inch, ensure you don't drill where the thermostat closes and seals or where it will be covered by the gasket or sealant.

Put the stuff back together, fill radiator, while filling remove the dark bolt on the intake manifold near the center and purge the air out of the system while filling the radiator.

Check for leaks after starting and as you drive it to warm it up feel the radiator for a slow warming, not fast high heat changes, this is a problem. Hopefully when it gets hot the fan will run on and off properly. This should a proper fix.

Hope this helps.

Water pump, (if it has a thermostat..remove it)...check your oil to see if there has been any water in it..it will look like lightly creamed coffee...then water pump seal is bad..
Check the water pump impeller..check the fins...see if it will spin without the engine running...(it should NOT!)..

The new pump shaft seal is no good. Get another pump.

bad water pump or thermostat would be my first guesses

air lock issue !!

Is the water pump operating?

Is the fan turning on? When you say new switch, are you referring to the fan relay? Check fan fuse(s).

Could be the coil pack going bad or fuel pump. Find the coil pack and spray water on the outside of it. Not a lot just a stream to keep it cool. It should be on top. Here is a video https://www.youtube.com/watch?v=woE4OIhCvAs

bad head gasket