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Boss V left wing slow to extend?

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BobLor

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Discussion starter · #1 ·
2005 Boss 8'2" V Plow /Smart Hitch2 and Ford 2005 F-250
Finishing up my drive today and all of a sudden the left wing will only extend from the V about 6 inches and stops. It will retract back to the V fine. I put the plow down in the V position, lower the Smart Hitch Tower and check the Hydraulic oil and the Hyd. oil is to the middle or higher in the outside fill spout.
I hooked up the plow again and the Left wing operated correctly, then slowed down and then finally only went out about 6 inches and stopped. Again it went back in to the V correctly. Right wing operates correctly.
I find no leaks on the ground under the plow.
Suggestions of what next to check?

Thanks
Bob
 
Discussion starter · #3 ·
slow left wing

Nope have not hit a thing. Only do my own drive no commercial work so the plow is pretty well babied.

Just re checked the outside battery cable connections, cleaned and re qreased again and the plug connections. Do not think this is the problem but easy to check.
Worked the left wing again after sitting for half an hour and it works very slow compared to the right wing.

Bob
 
#4 ·
BobLor said:
Nope have not hit a thing. Only do my own drive no commercial work so the plow is pretty well babied.

Just re checked the outside battery cable connections, cleaned and re qreased again and the plug connections. Do not think this is the problem but easy to check.
Worked the left wing again after sitting for half an hour and it works very slow compared to the right wing.

Bob
Click to expand...
Have you had it serviced ??? It may be that the spool that controls that function on your valve bank is sticking... I know the dealer that I use tears the hydraulic valve bank apart and cleans the internals could be as simple as a piece of crud making it stick
 
Discussion starter · #5 ·
slow left wing

Nope, have not had it serviced, but that is also what I am thinking, something is up with the left extend spool. Called the dealer and he is booked up until next week. His over the phone guess was spool or cylinder.

More lake effect snow forcast for tonight and tomorrow, but if I can get the left wing to go out and just leave it there I think I can at least muddle through the next few days until I can get to the dealer.

No real big deal as I just have to take care of my own property. And all vehicles are 4WD. But I thought maybe someone else had the same thing happen and could give a diffinative answer.

Thanks,
Bob
 
#6 ·
Do you have the Smartlock cylinders? We swelled the cylinder barrel on one a few years ago, and the result was the same as you describe. Use a c-clamp and slide it up and down the cylinder to inspect the diameter to the cylinder barrels - it does not take much to write off the cylinder, and the swelling is hard to see. It will most likely be swollen just above the base end. Solution is a new cylinder.

The same may apply to the non-Smartlock cylinders, but we've never had them, so I'm just speculating. Otherwise, there is little to bind in there.
 
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#8 ·
We never did figure that one out. I suspect on of two things. My first theory is that something failed inside the valving in the Smartlock, not allowing pressure relief. You would think that swelling would not make it more difficult to extend the cylinder, so valving failure is my number one idea.

My second theory is simpler - something was hit fast and hard enough that the cylinder could not relieve the pressure back to the tank fast enough. When I changed out the cylinder, the Grade 5 3/4" bolts were each bent. If one had of sheared, the cylinder may have not been damaged. This theory doesn't explain why swelling would make it tighter, unless the valving was damaged as a result of the impact.

We sold that plow a full season after that, and there was no hint of re-occurence. Maybe someone else has a theory.
 
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Discussion starter · #9 ·
slow left wing

well, I just went out and checked the left wing cylinder and no sign of swelling.
I still thank you for the heads up, always something to keep in mind for later.

A bulldozer operator buddy thinks it may be ice in the extend spool. I guess maybe, but I would have thought that would show up right away when the hydraulics are cold not after an hour of use. When I checked the hydraulic oil it was clear no sign of milkyness. But I did not change the oil after last season either. So I may be paying for my negligence.

Luckily so far the lake effect snow has missed my area and I am only getting squalls that drop a half inch at a time.

Thanks
Bob
 
#10 ·
OK -then take the 5 minutes it takes to swap the two angling hoses on the valve manifold. See if your problem migrates, or remains. You'll narrow down your search.
 
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#12 ·
This site is the best way to share, learn and troubleshoot. I've got to plow tonight, so it could be my turn tomorrow to seek help.
 
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#13 ·
If that doesn't work, try unbolting one end of the cylinder and move the plow manually to rule out any problem in the hinge. Doubtful, but could be an issue. I wouldn't suggest extending the cylinder while unbolted, you may be stuck there.

Good luck.
 
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#14 ·
I just had a customer bring in a plow with the same problem. There was no swelling. His right hand smart lock cylinder was bad.
 
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BobLor
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