CAT backhoe overheating

Alexp08 · Jun 18, 2018

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 · Jun 18, 2018

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 · Jun 18, 2018

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 · Jun 18, 2018

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 · Jun 18, 2018

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

Stimw · Jun 18, 2018

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

Alexp08 · Jun 18, 2018

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

Alexp08 · Jun 18, 2018

No moisture on the cap

ddbackhoe · Jun 19, 2018

Alexp08 said:
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 559112 View 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