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Old 08-12-2010, 03:12 PM   #1
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Location: Pahrump, NV and Cresbard, SD
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Foretravel 6V92 Hydraulic cooling fan

I am in need of information regarding the connection(s) involved in a 1992 or similar Foretravel hydraulic engine cooling fan system. The coach has a 6V92 engine and I believe the fan system is not correct.

My system is quite basic. Reservoir, hoses, pump, pressure relief valve and fan motor.

I am thinking there should be some means of increasing the fan rotation speed as the water temperature rises. i.e. electrical or?

In any case there is no such thing.

If you have such an installation would you please send a photo(s) and or description showing the connections between the engine switch (if there is one) and the pressure valve. Perhaps I can then make mine correct.
Respectfully,
Gary
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Old 08-18-2010, 06:24 PM   #2
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On a older motohrome with a hydraulic fan, there is a couple of lines that go to a thermo switch on the upper (hot) side of the radiator to allow more fluid to increase the fan speed as the motor heats up. my fan rotates slowly at normal temps and increases to a roar(whine) when the motor gets up to 3/4 scale on the gauge. I can only hear this if in a tunnel or block wall area.
HTH
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Old 11-06-2010, 11:00 PM   #3
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Follow up

Quote:
Originally Posted by 92hummer View Post
I am in need of information regarding the connection(s) involved in a 1992 or similar Foretravel hydraulic engine cooling fan system. The coach has a 6V92 engine and I believe the fan system is not correct.

My system is quite basic. Reservoir, hoses, pump, pressure relief valve and fan motor.

I am thinking there should be some means of increasing the fan rotation speed as the water temperature rises. i.e. electrical or?

In any case there is no such thing.

If you have such an installation would you please send a photo(s) and or description showing the connections between the engine switch (if there is one) and the pressure valve. Perhaps I can then make mine correct.
Respectfully,
Gary

I am now extremely familiar with the hydraulic fan system in our coach and have learned a lot.
#1- Foretravel no longer stocks a direct replacement hyd motor. Problems...the new motor has metric threads so the fittings from the old motor will not work. Doesn't mount the same.
#2- The new motor mounts entirely different than the original and requires (2) adapters that must be built at a machine shop and they are $$$$$$$. #3- Due to the new mounting arrangement the hoses are not appropriate and on it goes.
#4- Foretravel only provides 90 deg -10 fittings for the motor and straight fittings would work much better. Again due to the pump manuf in Italy and tapped for metric fittings.............straight fittings not readily available.
#5- After I got the adapters from the machine shop (which were in accordance with the Foretravel Engineering drawings) I got under and assembled everything only to find that the assembly was 2" too far from the radiator shroud so out it all came. I fabricated 2" spacers and put it all back together. Now the radiator clearance was o.k. but the fan blade would not clear the corners of one of the adapters. An hour with a die grinder to take care of the corners.
#6- If I had it to do again I would pitch the whole system and buy from a company that supports their products.
Gary
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