Deere/hitachi 35d overheating issue

[673moto]

actually it’s an Airman ax40ur-5... but it’s dang near identical to a 35d...
Except for the boom.
Im having an issue with this thing getting too hot.
Usual things I checked: thermostat, cleaned radiator, fan belt tension. none of those have fixed it.

Also seems to be related to the travel motors...gets hot faster if I’m tracking around.
2 speed isn’t working, when I bought it was told there is no 2 speed but it has the switch and the travel motors have an additional line for 2 speed. So it’s stuck in low?
Motors shot and causing overheat?

 

[Landclearer]

If the machine has a fan clutch try checking that. Had the the same trouble with a cat 320d. Fan would turn enough to look like it was working then under a load it wouldn’t turn fast enough to cool the machine.

 

[mg2361]

Engine overheat or hydraulic overheat?

Radiator top top tank vs bottom tank temps?

Fan on correctly?

Was the temp at the thermostat housing checked with an infrared gun to confirm you are actually overheating (if engine overheat) and not having a sensor issue?

 

[673moto]

I don’t think it has a fan clutch. I’ll check on that tho

And of course I never grabbed my temp gun to do any detailed investigation...good call... I’ll take measurements.
Will be a day or 2 before I can get back to it and run it again.

 

[Delmer]

i think there was a yanmar diesel engine in an excavator that had pulley separation issues. Check the fan, pulley, for movement when it's hot.

 

[673moto]

Thanks Delmer, I’ll look into that.

hey, you didn’t just sell me a motor for my cat skid steer, did you?
(Or maybe there’s more than one Delmer out there)

 

[Delmer]

No, Delmer is not, in fact, my real name.

 

[HATCHEQUIP]

Some of the aftermarket travel motors don't have the 2 speed function yours might have been changed . does yours have the plastic fan customer had one and the fan blades were actually worn enough to cause a heating problem

 

[673moto]

It Does have a plastic fan...thanks!
Will look into that as well.