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FC (Forward Control Unique Issues) If you have a unique issue with your FC model coach and it can't be answered in one of the other forums here, then this is where you can list it.......List your FC Parts here too.

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  #1  
Old 12-07-2019
Randy Dupree's Avatar
Randy Dupree Randy Dupree is offline
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Default FC steering,weak at rest.

I guess most of you know that the FC has always had a weak power steering system while the coach is at rest.
Slowly moving the bus forward makes the steering work so much better.
Well,thats really true on every vehicle,steering them at rest is hard on tires and suspension.


Mike H and i have talked about this issue many times through the years and hes had bigger pulleys made,with 2 belts instead of one and other mods,bigger lines and different fluids..
While some gains were made it was not perfect.


Today Mike was working on an FC that came into his shop with steering issues.
He has a new pump,new lines that were rerouted away from the heat of the manifolds and of course new belt and new fluid.
With the coach on jack stands Mike was turning the wheel back and forth to burp the system.
But the fluid would never clear up,it was always foaming,lots of air in the fluid.


We are talking on the phone about it and i said "take the filter out of the reservoir and see what happens.


He calls me back in an hour,he took the filter out and that cured it,no foaming fluid and it turns pretty good with the coach at rest.
Then i asked the question,why does the thing even have a filter?


WE both agreed that BB bought the canister and it came with a filter,so they left the filter alone and its always been a problem but we ignored it,thinking that if it has a filter it needs a filter.


I don't think it needs a filter on the power steering.
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  #2  
Old 12-08-2019
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It probably doesn't need the filter but mine is in place and as you know my coach steers well. So why? I don't really know, but here are some points: my reservoir is in the battery box, lines, box and pump all rebuilt. The lines had several odd fittings including reducers and 90's now removed. In my case I don't think it's any one thing, it's the combination of all the improvements.
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  #3  
Old 12-08-2019
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Quote:
Originally Posted by Randy Dupree View Post
I guess most of you know that the FC has always had a weak power steering system while the coach is at rest.
Slowly moving the bus forward makes the steering work so much better.
Well,thats really true on every vehicle,steering them at rest is hard on tires and suspension.


Mike H and i have talked about this issue many times through the years and hes had bigger pulleys made,with 2 belts instead of one and other mods,bigger lines and different fluids..
While some gains were made it was not perfect.


Today Mike was working on an FC that came into his shop with steering issues.
He has a new pump,new lines that were rerouted away from the heat of the manifolds and of course new belt and new fluid.
With the coach on jack stands Mike was turning the wheel back and forth to burp the system.
But the fluid would never clear up,it was always foaming,lots of air in the fluid.


We are talking on the phone about it and i said "take the filter out of the reservoir and see what happens.


He calls me back in an hour,he took the filter out and that cured it,no foaming fluid and it turns pretty good with the coach at rest.
Then i asked the question,why does the thing even have a filter?


WE both agreed that BB bought the canister and it came with a filter,so they left the filter alone and its always been a problem but we ignored it,thinking that if it has a filter it needs a filter.


I don't think it needs a filter on the power steering.
Air causes premature wear, so you probably need a filter.
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  #4  
Old 12-08-2019
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I think it has something to do with the microns of the filter too.
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  #5  
Old 12-08-2019
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Quote:
Originally Posted by Dave&Beth View Post
Air causes premature wear, so you probably need a filter.

Dave,with the filter the fluid was full of air,so bad it was foaming and blowing out of the vent.
Without the filter no foaming.
Keep the ideas coming!
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  #6  
Old 12-08-2019
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Someone, maybe Finn drilled a vent hole in the reservoir,
Although it may let air in or out???????
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  #7  
Old 12-08-2019
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Quote:
Originally Posted by Bill Pape View Post
Someone, maybe Finn drilled a vent hole in the reservoir,
Although it may let air in or out???????
I drilled a hole in Johns reservoir and put a vent in it,i think everything with moving fluids needs a vent.
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  #8  
Old 12-08-2019
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Hey Dave,i wonder what the reservoir had as an original filter?
And did it act as an air separator/remover?


Once Mike removed his filter he had no more air in the fluid.
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  #9  
Old 12-08-2019
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Major improvements were observed on my 83 when a reservoir was mounted directly behind the pump.
Most passenger car applications don't filter PS oil, not really a requirement, a cooler circuit would be beneficial, the oil gets hot, minimizing hard radii in the plumbing is helpful. Problem is getting a proper micron filter. I replaced the reservoir filter with a matching part number from NAPA, reservoir was produced in WI likely for a tractor application, not for a highway power steering application.
At any rate pulling this replacement filter was like magic, before it's blasting oil out the vent @ lock to lock cycles, no filter, no upset, obviously this filter was restricting oil significantly. Added a little STP too @ Randy's suggestion.
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  #10  
Old 12-08-2019
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My reservoir has a poorly fitting lid (not just the threaded dipstick but the entire lid) so I have never had a vacuum or pressurization issue. My reservoir is essentially behind the pump. I'll pull my filter and check the number but I think I got the number from Finn. A good friend who wrenched for BFI in the 80's said he had never seen a power steering filter on any of the trash trucks
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