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Belarus 65 horse with rhino medium mower:

Problem: Gets to runnin hot after about an hour and a 1/2 shreddin milkweed and such.

coolant/water at 50/50, new wter pump, radiator cap, thermostat, keep gearboxes well lubed on mower

tried running it through different gears, doesn't make a difference

is it the mower (medium duty) thats being over worked?

mc
 
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The radiator exterior is full of chaf and the fan cannot pull air through the fins. Blow back through the radiator fins with compresssed air or if air is not available wash with a garden hose back to front.
Agmantoo
 

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Belarus tractors have the oil cooler mounted in front of the rad so it is prone to plugging as Agman says. These oil coolers tend to leak slightly and deposit a grimy film that builds up. Blow the rad out as best you can and if you can unbolt the oil cooler do so, then it will have to be degreased and power washed. If that doesn't so it check the air cleaner, change the oil in the bottom of it and the screens could need washing out too.
 

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What size is the 'medium' mower? I assume you mean medium duty, but how many feet of mower do you have?

Clean the radiator, make sure the belt is in good shape (not wore thin) and tensioned tight.

--->Paul
 
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The mower is just under 8 feet wide. It is a medium duty.

Never thought about the oil bath air cleaner....gonna get on that this weekend.

The radiator is in good shape/clean. Whoever is operating that day also gets to wash/clean the tractor before they put it up.

Thanks for the responses.

Regards from Western East Texas

mc
 

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Are you sure 50/50 mix is the correct mix ratio. Also make sure you clean the raditor fins. Back blow them out.
 

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Please define 'gets to running hot'; does the radiator blow off pressure? Does the machine get too hot to touch (other than the exhaust, ect)? Smoltering smell?

Be sure youare running the mower with the front down to cutting height and the back is raised at far as it will go.
 
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Gets to running hot: Needle at upper end of normal range, on the last bit of green before it hits the white band. Not furiously hot just hot enough to get my attention and back off and let her idle for about 20 mins before she cools back down.

Thanks

mc
 

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Air cleaner didn't do it? Could be the thermostat isn't opening up. Cheap to try anyhow.
 

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agmantoo
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If the thermnostat was not working, I doubt that it would let the tractor cool down as you mentioned. Are you having to add coolant to the radiator? If so, does the overflow pipe steam any or show evidence of coolant escaping? Can you see by looking into the radiator throught the filler neck into the openings of the flues in the inside the radiator. If you can see in there are the oval holes clean or is there corrision showing? Sounds as if the radiator needs rodded.
 

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If the neddle does not go any farther than the edge of the green, your fine. If it goes to the red there is a problem, it could be a gague or sending unit out of calirbation. Open the radiator cap when it is cool, look for water circulation when it is running, circulation indicated adequate water flow. Next time it goes to the edge keep running it to see if it goes further, just shut it down before it goes to bed in the red.
 

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I think if I remember right the 500/800 series Belarus uses a mechanical temperature guage like an old Massey. Check the line from the guage to the block. Actually unbolt the dash (the flat deck part) and open it up to see how much crud is in there.
 
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