Don`t know about that model but recently we had some info about toyotas overheating and apparently on certain models there is different sized pulleys and fan belt also special anti freeze too. worth a phone call to toyota technical to find out (yes I know its like waking the dead but stick at it the info was good for us.)

I have had serious problems because of the pedal torque, with a toyota 5fg15 engine 5k. I tuned the engine torque to be free. the operator moved him to be arrested, said he was clutch pedal. as the torque was arrested, the engine warmed enough, the oil of torque, circulates in the radiator.

well TAILIFT
what engine it uses? have seen that the head of the engine was much lowered and the compression rate was too high? in this case must be made recess chamber valves. the cylinder block when disassembling the hill was well clear of rust? the fan is indicated? well see the mounting position, if the contrary does ventilation. torque see if the oil filter torque, it is indicated. the pump body, where the turbine works, did not suffer wear and so the pump has no power! mm see if he has to face in the back of the engine. see if the fan is near the radiator. puts a big fan of blades. pulley increases fan for this to have more spin. the radiator has the proper number of elements? the water circuit is connected? there is much that can go wrong... a hug
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the inching pedal is the source of many overheating problems. check the adjustment. it is 2 stage and the first stage lowers the pressure to about 40 psi. it allows the truck to run but allows disks to slip and trans gets very hot.

Other considerations would be ambient temperature of the operating environment, cleanliness of the operating environment (is the radiator getting plugged with debris?) as well as the operator's driving habits (are they riding the inching pedal and running the hydraulics over relief?) and any hydraulic attachments the truck may have on it such as a carton clamp or push/pull unit. How many hours are on this machine? Have the hydraulic and transmission pressures been recorded and compared to specification?

50/50 antifreeze mix? Bleed air from system? Is the coolant disappearing as it runs?