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  #1  
Old 12-15-2008, 03:20 PM
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Craigwell Craigwell is offline
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Control Valve Problem - Fisher

Alright, I have this issue with my older Fisher style setup..

The blade lifts and angles perfectly, but I cannot get the lift cylinder to lower! I have recently installed this setup on my 1976 F250, and discovered the problem today.

I don't think it has anything to do with the Cylinder, as the pump does not load up whatsoever when I move the spool in the downward position on the DCV. I have verified that the cable is free, and that the adjustment is proper. The spool moves easily the full range of it's travel, at least what I can see from the exterior.

Is anyone familiar with this type of valve? Wondering how exactly to repair what I assume is something sticking inside.

Thank you for any advice. Excellent Site!



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Old 12-15-2008, 08:00 PM
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Craigwell Craigwell is offline
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it now occurs to me also that the pump wouldn't be involved with the act of retracting the lift cylinder... anyone have any ideas? The sucker hadn't even bled down an inch in 4 or so hours!! I ended up taking the tension off by jacking and blocking up the blade, just to be safe..
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Old 12-15-2008, 08:53 PM
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Could be an air pocket in the line.
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Old 12-15-2008, 08:59 PM
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Craigwell Craigwell is offline
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the lift cylinder has only one line at the bottom of it, and it did extend the piston fully when I tried it.
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Old 12-15-2008, 09:12 PM
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Crash935 Crash935 is offline
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For giggles, try loosening the hose to the lift cylinder and see if it drops, dont take the hose all the way off, just crack it enough to let some fluid trickel out.
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Old 12-15-2008, 09:16 PM
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Craigwell Craigwell is offline
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Hi there,

I will try that at each end of the hose.

Thank you for the suggetions.. I'm working away at a checklist here to put into play for the morning.
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  #7  
Old 12-15-2008, 09:38 PM
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if that doesn't work, try loosening the gland nut on the top of the cylinder.
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Old 12-15-2008, 09:50 PM
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a friend with some hydraulic experience mentioned for me to take a look at the reliefs on the valve as well.

When I was at Princess Auto for Quick Disconnects the other day; the Hydraulic guy looked at the valve and mentioned the relielfs were "set high".

I assume this means I want to back the relief for the raise / lower side of the valve out a bit. I'm still looking for a diagram or service manual that mentions how to work on these valves or at least an exploded diagram.

Thanks again
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Old 12-15-2008, 10:18 PM
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Niteman9 Niteman9 is offline
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Like Crash said crack a fitting on the hose and see if it will drop. Yes means problem in the valve no means problem in the cylinder. I have the same valve on my old dodge and was having problems. Sometimes I would have to race the motor to get the plow to raise with any speed. I took the valve apart and cleaned and lubed it up and change the fluid and have not had the issue again.
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  #10  
Old 12-16-2008, 10:44 AM
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Craigwell Craigwell is offline
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I was able to resolve the problem this morning. I cracked the cylinder line at the valve, and nothing happened. Then I backed out the relief about 1/2 a turn, and that did it! Works perfectly now.

Unsure why it was screwed in too much. I wonder if the guy who sold it to me thought it was toast, hence reason for selling..

Oh well. $600 later, and I've got a functional hyrid Fisher / Diamond Plow setup!! (Diamond 7.5' Blade, Fisher Hydraulics, Custom Mount)

Thanks for everyone's assistance.
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