John Deere 4720 running hot in 15 minutes.

[blanchb]

Is there a fan clutch? Is it engaging

It doesn’t have a fan clutch.

The belt wasn’t slipping and it was turning the right direction.

 

[Shimmy1]

I’m trying to follow the flow of water through the head and block when the thermostat is closed and I don’t see a port that allows the water to circulate from the discharge side of the pump then through the engine and back to the suction side of the pump. I always thought that when the thermostat is closed, the water will still circulate through the engine. But when the engine gets hot the thermostat will open then it will allow the water pump to pump through the engine then out to the radiator then back to the pump.

Is the fan installed the right direction? We had a skid steer once, Deere, not that it matters, but the fan was flipped around. It still moved air, but only about half as much as it should. The fan blades should be moving like your hand cupping air.

 

[blanchb]

Is the fan installed the right direction? We had a skid steer once, Deere, not that it matters, but the fan was flipped around. It still moved air, but only about half as much as it should. The fan blades should be moving like your hand cupping air.

Good question. Yes. It is pulling air through the radiator from front to back.
I did route the belt in the wrong direction once and the fan was going backwards. But I corrected it.

 

[Shimmy1]

Good question. Yes. It is pulling air through the radiator from front to back.
I did route the belt in the wrong direction once and the fan was going backwards. But I corrected it.

If you can route it wrong to spin the fan backwards, is it possible to spin the water pump backwards?

 

[blanchb]

If you can route it wrong to spin the fan backwards, is it possible to spin the water pump backwards?

Another good question. I did check, both belt routes and they both spun the water pump the right direction.

 

[Shimmy1]

Another good question. I did check, both belt routes and they both spun the water pump the right direction.

Is the pump driven with the flat side of the belt, or the grooved side? Sounds like there could be a couple different routing possibilities if you had a longer/shorter belt? I'm sorry if this sounds dumb, but when the water pump was off, I'd have taken a paint marker and put an arrow on the pulley showing direction.

 

[blanchb]

Is the pump driven with the flat side of the belt, or the grooved side? Sounds like there could be a couple different routing possibilities if you had a longer/shorter belt? I'm sorry if this sounds dumb, but when the water pump was off, I'd have taken a paint marker and put an arrow on the pulley showing direction.

It’s driven by the flat side.

 

[blanchb]

I’m trying to follow the flow of water through the head and block when the thermostat is closed and I don’t see a port that allows the water to circulate from the discharge side of the pump then through the engine and back to the suction side of the pump. I always thought that when the thermostat is closed, the water will still circulate through the engine. But when the engine gets hot the thermostat will open then it will allow the water pump to pump through the engine then out to the radiator then back to the pump.

I figured out the water flow. It does circulate through the engine and back to the suction side of the pump when the thermostat is closed. They have a journal molded into the timing cover that routes water back to the suction side of the pump.