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What Temperature is Normal on a Bobcat Mini Excavator with Kubota Engine?

D

Desidero

Member
Hey everyone,

I’ve been watching the temp gauge on mine lately and noticed it seems to run warmer than I expected when digging for longer periods. Gauge still sits in what looks like the normal area, but I’m curious what people actually see in real use.

I tried searching for the operating range but most answers are all over the place. Just wondering what the normal Bobcat mini excavator with Kubota engine operating temperature range looks like in the real world.
Machine isn’t overheating or throwing warnings. Just trying to understand what’s considered normal before I start worrying about something that isn’t a problem.
 
People stress too much about exact numbers. Most Kubota diesels are designed to run hotter than older machines. Seeing around 200°F or even slightly above under load isn’t unusual as long as coolant level is good and the temp stabilizes instead of climbing nonstop. Where you need to pay attention is rapid spikes or sudden swings, not a steady warm temperature.
 
A lot depends on what you’re doing. Digging puts both engine and hydraulics under heavy load, so temps naturally rise. I’ve seen machines sit around the mid-180s doing light work and move closer to 200+ when trenching for long periods.As long as the fan is moving air and coolant isn’t boiling over, that’s usually normal behavior.

If it suddenly starts running hotter than it used to, then start checking airflow or coolant flow.
 
I went through this exact panic last year. Thought mine was overheating because it sat higher on the gauge after installing a new sender. Turned out the old one was just reading low the whole time.
 
If you want a realistic baseline for the bobcat mini excavator with kubota engine operating temperature range, don’t rely on the dash gauge alone. Use the gauge as a trend indicator, then verify with an IR temp gun like @TPierre

What I normally do is run the machine until fully warmed up, then shoot the thermostat housing and upper radiator hose. If the dash says “hot” but the thermostat housing temp is stable and consistent, you’re usually fine. Where I start to worry is when the number keeps climbing without stabilizing, or it climbs faster than usual doing the same work. Also keep in mind heavy digging raises hydraulic temps too, and that heat stacks on the cooling package. If you run any high demand attachment, overheating becomes more likely because both engine and hydraulics are dumping heat into the same cooling system.
 
I’ve seen a lot of people search bobcat mini excavator kubota engine runs hot when digging and assume something’s wrong, but digging is basically the perfect recipe for higher temps. You’re at steady RPM, high hydraulic load, and often low travel speed so the cooling package gets coated with dust and isn’t seeing clean airflow. If the temp rises under heavy trenching but drops back down within a few minutes of light work or idle, that usually points to airflow or cooler cleanliness more than a mechanical cooling failure.
 
Check the coolers from the back side. They can look clean from the outside and still be packed tight between the radiator and hydraulic cooler.
 
One thing that helped me stop guessing was learning the difference between “warm and stable” and “creeping.” A steady warm temp is normal. A temp that slowly creeps higher every 10 minutes under the same load is when I start checking coolant level, cap condition, fan operation, and cooler fins. A lot of guys also forget that pressurized coolant systems can safely operate around 200°F or a bit above without being close to boiling, assuming the system is in good shape.
 
Just wanted to add a follow-up here in case someone else ends up searching the same thing later.

After reading through the replies I decided to check the cooling stack more carefully instead of assuming something was wrong with the engine itself. From the outside the radiator looked clean, but once I pulled the side panels and looked between the radiator and hydraulic cooler there was actually a lot of packed dust and fine debris.

Spent about 20 minutes blowing everything out with compressed air and rinsing the fins from the engine side outward. After that the temperature behavior changed noticeably.

Before cleaning it would climb close to the upper part of the gauge while digging. Now the machine warms up normally and stays much more stable during trenching.

So if anyone finds this thread while searching about a bobcat mini excavator with KUBOTA engine operating temperature range, definitely check the cooler stack first. A partially blocked radiator or hydraulic cooler can make it look like the engine is running hot when digging even though the engine itself is fine.
 
That’s actually one of the most common causes. Mini excavators move a lot of dusty air through the cooling system especially when trenching or grading dry soil. Over time the radiator, hydraulic cooler and sometimes the oil cooler can get packed with debris even if the outside looks clean.
I’ve seen machines where cleaning the cooler stack alone dropped operating temps enough that the operator stopped worrying about the engine running hot.
 
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