Viscous fan

[acorn]

As title really, how do you test a viscous coupling on a tractor radiator fan?
Tia acorn

 

[Timbo]

Firstly it should be locked and roar at cold start for 30seconds or so with the engine at 1500rpm, then begin to subside.

Second, warm tractor fully up for a half hour, turn on the a.c. and cover the rad with a bag running at 1500rpm or so again and once the thermostat has opened and the rad hot, i.e. a high heat load, the fan should begin to roar.

Keep an eye on the temp gauge whilst testing obviously.

That's a good start, but checking if its fully locked can't really be done without an optical tachometer.

 

[pycoed]

I have no experience of tractor viscous fans, but I can't see why they should be different to car/van fans. Standard procedure is to try to stop the fan with a rolled up newspaper. It should stop the fan on a cold engine, but not on a hot one if the viscous coupling is working correctly.

 

[davidroberts30]

I have no experience of tractor viscous fans, but I can't see why they should be different to car/van fans. Standard procedure is to try to stop the fan with a rolled up newspaper. It should stop the fan on a cold engine, but not on a hot one if the viscous coupling is working correctly.

can you use your fingers if the paper wears down far enough

 

[Mur Huwcun]

can you use your fingers if the paper wears down far enough

Of course you can, if you need to visit A and E afterwards at least you’ll have the consolidation that the viscous coupling is working ish!!!

I’ve used a 2*1 baton and a floor brush handle against the centre hub aswell

 

[acorn]

.....just trying to get to the bottom of an overheating issue. Is it the radiator, fan, water pump, thermostat.
Case jxu 100, 5500 hours.

 

[goodevans]

MK Don's have the most viscous fans closely followed by Leeds Utd I think