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Topic: Hydraulic fan controller (Read 2277 times) previous topic - next topic

Re: Hydraulic fan controller

Reply #20 –
Quote from: Rudy –
MisterEd,  I second the "very nice installatiion".  I do not have the equipment and ability to machine a bung.  So Bravo to you Sir.
But you do have many people you have helped over the years willing too help out if you need something. Possibly more powerful than tools and skills? I learned 40 years ago about the sprayed aluminum coating on these waterlines. Still interesting but probably easier to powdercoat. MisterEd I can't imagine the hours of cleaning and painting you have done on your coach, looks like you own a new coach. Very nice.
Scott

Re: Hydraulic fan controller

Reply #21 –
Quote from: dsd –
....MisterEd I can't imagine the hours of cleaning and painting you have done on your coach, looks like you own a new coach.
I was thinking the same thing.  Picture was just a small section of the engine bay, but looks very, very clean and pristine!

Re: Hydraulic fan controller

Reply #22 –
Quote from: MisterEd –
Thanks, Scott. IMO, the best benefit of having it there is that it's a snap to get at for the low speed adjustment, should I need to do that.

Can you post the Product number on the wax valve and explain the Low speed adjustment? I used a needle valve and adjusted it to slow the flow for low speed so thinking maybe I can remove that portion..

Re: Hydraulic fan controller

Reply #23 –
Quote from: dsd –
Okay, is this were Foretravel originally installed them? Rudy for $1000 I'll can source the bung and correct hoses without adding cheater hoses. I'd rather see the money go to you for upcoming aqua hot consultation and repairs. May have to work a deal with you. I'm currently thinking inboard of the frame support strap below my coaches current fuel filter may be more convenient, directly forward of the current controller.
Scott
That is where mine is, as shown on my photo.

Re: Hydraulic fan controller

Reply #24 –
Quote from: DavidS –
Can you post the Product number on the wax valve and explain the Low speed adjustment? I used a needle valve and adjusted it to slow the flow for low speed so thinking maybe I can remove that portion..
Part number I used is 553109857190. To adjust cold fan speed, with the engine OFF, you remove the #17 silver cap, beneath it is a hex socket adjuster screw #12. Turning it in (clockwise) should reduce flow, increasing cold fan speed. CCW should reduce cold fan speed. The attached drawing was originally posted by Chris. The explanation of the adjuster was a bit vague. I determined it's function by studying the sectional drawing. My conclusion assumes the adjuster has right hand threads. Note that this adjuster will have NO effect on closing temperature, unless it was turned in to the point of the valve never going into bypass. That would negate the reason for having the controller.  ;)

NOTE: Put the cap back on after making adjustments (in small increments) or the bypass oil will flow out of the hole, making a mess, or worse?

Greg

Re: Hydraulic fan controller

Reply #25 –
I was just out at the coach and had removed the factory control valve and installed a needle valve. Closed is 100% and opened very little dropped to zero fan speed. A 1/4 of a turn the fans stopped. This shows that my system will operate once I install the new valve. I opened up the solenoid to look for something plugging it but was clean. Greg thank you for posting. It has really helped me decide how I want to do this in the coming weeks.
Scott

Re: Hydraulic fan controller

Reply #26 –
Quote from: dsd –
I was just out at the coach and had removed the factory control valve and installed a needle valve. Closed is 100% and opened very little dropped to zero fan speed. A 1/4 of a turn the fans stopped. ...
Scott
The oil volume through the controller is to bleed off pressure. The pressure is what pilots the valve on the front fan motor. The way it's made, very little change in volume effects a sizable change in pressure at the pilot.

An FYI for those who may be concerned about IAT getting high when the fans are running slow, Blue Bird used a thermo switch that would open when the intake air temp exceeded 150F. (See attachment) The switch operates a, series plumbed, N.C. solenoid valve in the pilot circuit, prior to the wax controller. In this way, the fan speed can be increased when the IAT exceeds the temp of the thermo switch, independent of coolant temp. This is something I'm considering.

Greg

Re: Hydraulic fan controller

Reply #27 –
Quote from: MisterEd –
T
An FYI for those who may be concerned about IAT getting high when the fans are running slow, Blue Bird used a thermo switch that would open when the intake air temp exceeded 150F.

Greg
This really makes sense. That link is such a pleasure to read. Shame FT doesn't have the same. I agree that would be a good addition. Says it runs fans at 50% for cac cooling.
Thank you again.
Scott