CAT backhoe overheating

[Alexp08]

I have a 1993 426B backhoe that has been over heating lately. It was taken into the shop for some hydraulic work and ever since it's been over heating (I'm not insinuating they did anything, just stating that it started after). Anyways I replaced the thermostat which the old one looked good. I'm hoping the picture can give some insight. The heat gauges dont move and when the key is placed to the accessory position not all the lights turn on like they use to. The light that use to turn on was the second from the right. Any help would be appreciated. Thanks!

 

[RedNeckRacin]

What kind of hydraulic work? Could any of the coolers been damaged? Have you cleaned the radiators lately? Will it over heat sitting idling or do you have to run it hard?

 

[Alexp08]

The hydraulic pump came off the mount so they just placed that back on. The radiator has been cleaned after this starting happening. And it usually take a hour for the warning buzzer to start after running it. Never let it sit idle for that long

 

[EddieWalker]

How clean is your radiator? How many radiators do you have? I have a New Holland 555E, and I like to blow mine out with air from my compressor, but sometimes in the heat of summer, that's not enough and I really have to give it a good washing with the hose to get it clean.

 

[Alexp08]

We had it professionally cleaned and we also power washed it. And there are 2

 

[Stimw]

Is it loosing any water/coolant?
Oil OK, doesn't look like a gray milkshake?
Moisture on oil filler cap?

 

[Alexp08]

It's not losing any coolant, the oil looks good

 

[Alexp08]

No moisture on the cap

 

[ddbackhoe]

I have a 1993 426B backhoe that has been over heating lately. It was taken into the shop for some hydraulic work and ever since it's been over heating (I'm not insinuating they did anything, just stating that it started after). Anyways I replaced the thermostat which the old one looked good. I'm hoping the picture can give some insight. The heat gauges dont move and when the key is placed to the accessory position not all the lights turn on like they use to. The light that use to turn on was the second from the right. Any help would be appreciated. Thanks!View attachment 559112View attachment 559113

I'd get the guage working first. Have you checked the sending unit and wires yet? I attached a quick check method. How do you know it's overheating, just because the buzzer is sounding?

How to Test a Coolant Temperature Sensor | DoItYourself.com

 

[Alexp08]

That's my next step. I'm just going to replace them as they're the original and they're not that expensive

 

[EddieWalker]

I had an issue with my dozer's hydraulics overheating and eventually found it to be a bit of a kink on a line up under the seating area that was very hard to see. I followed each and every line to look for something, anything, that could be causing it. Sucks that all I had to do is pull the line down and use a hose clamp to keep it where it needed to be so it wouldn't kink up again.

 

[Alexp08]

Okay so I replaced the temp sensors. The light still isnt coming on and after after a hour of running I get the warning beep that its over heating, but all my gauges are in the green.