Jason B
Member
hey guys,
Have a Volvo trackhoe overheating issue. I went to the unit and ran it to diagnose the issue. Running the machine hard it takes about 15 minutes for the temp to slowly sneak up to overheat temperatures. Once the load is removed the engine cools quickly back to normal. It was around 0 C/32 F ambient outside when testing. With a laser temp gun I shot temperatures as follows. Back of head 220 F. Thermostat housing 210 F. Top rad hose at rad 200 F. Rad hose coming back to water pump 185-188 F.
I spent a good 45 minutes blowing out radiators. Got a lot of dust out but it made no difference.
Unit has a hydraulic fan. On the dash the fan speed does not register. Shows 0 rpm. The fan is spinning when it says this, but not very fast.
I feel the fan is not spinning fast enough and it is an air flow through the rad issue. The temperatures I shot indicate inadeqaute cooling through the radiator. Coolant flow seems good. Thermostat clearly opening and I don’t believe is a problem.
Any ideas or info on this fan circuit would be a huge help.
Is it a variable rate fan?
Or Fixed displacement and needs a pump or motor? (Change quite a few Deere pumps and motors for this reason)
What kind of flow rate should I see if I was to hook up a flow meter?
Have a Volvo trackhoe overheating issue. I went to the unit and ran it to diagnose the issue. Running the machine hard it takes about 15 minutes for the temp to slowly sneak up to overheat temperatures. Once the load is removed the engine cools quickly back to normal. It was around 0 C/32 F ambient outside when testing. With a laser temp gun I shot temperatures as follows. Back of head 220 F. Thermostat housing 210 F. Top rad hose at rad 200 F. Rad hose coming back to water pump 185-188 F.
I spent a good 45 minutes blowing out radiators. Got a lot of dust out but it made no difference.
Unit has a hydraulic fan. On the dash the fan speed does not register. Shows 0 rpm. The fan is spinning when it says this, but not very fast.
I feel the fan is not spinning fast enough and it is an air flow through the rad issue. The temperatures I shot indicate inadeqaute cooling through the radiator. Coolant flow seems good. Thermostat clearly opening and I don’t believe is a problem.
Any ideas or info on this fan circuit would be a huge help.
Is it a variable rate fan?
Or Fixed displacement and needs a pump or motor? (Change quite a few Deere pumps and motors for this reason)
What kind of flow rate should I see if I was to hook up a flow meter?