FEL Speed: Kubota Review  -- Kubota Tractors Discussion Forum and Review FEL Speed: Kubota Review -- Kubota Tractors Discussion Forum

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 11-22-2003, 22:10 Post: 69369
sapman



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 FEL Speed

I have a Kubota 3130 with a LA723 FEL. My problem is loader speed. It is so quick on the down cycle that it becomes unstable. Also if I work it hard, the seals will leak around the cylinder rods. Have replaced 1 set of seals on one cylinder already. Is there a restictor that goes in the lines to slow down the speed?

I used to work for the dealership and assembled new Kubota's and Boomers but have never seen loader speed such as this. Dealer is telling me they have noticed the faster speeds also.






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 11-22-2003, 23:06 Post: 69372
DRankin



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 FEL Speed

Blowing seals and uncontrolable speed?

Too much system pressure? Have you put a gauge on the hydraulic system to see where the releif valve is set?






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 11-23-2003, 08:41 Post: 69390
TomG

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 FEL Speed

I guess it's the lift rather than the bucket circuit. The leaks sound like a pressure thing but the speed may be a design thing.

Put a big pump along with big valves that have larger ports then heavy loads will drop fast. Sometimes flow restrictors in cylinder lines are used to slow things down but these are some down-sides. Lower engine rpm might help some but then there's likely be some oil cavitation in the cylinders, which wouldn't be much a problem. Some more expensive cylinders have cushioned stops but that wouldn't help stopping loads mid-way.

More 3ph weight might improve stability but if the relief pressure is high then bigger loads can be picked up, which lower faster and have more stability problems. If loads, ballast weight and the relief pressure are in spec and stability remains a problem then I'd expect a factory fix before long. You don't really want to depend on feathering valves to keep from ending up on your nose.






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 11-23-2003, 11:41 Post: 69399
bnrhuffman



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 FEL Speed

The loader on my 3130 drops fast also but I dont see it as a problem. Whats wrong with feathering the valve? Will this cause damage or wear? I feather the valve almost all the time to smooth things out, curl and lift at the same time and do precise work. is this something I shouldnt do or is abnormal?






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 11-23-2003, 13:14 Post: 69400
TomG

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 FEL Speed

No problem feathering valves that I'm aware of. In fact I think of feathering as an essential skill. Especially with hoes, banging weight around on the end of long levers creates big shock loads.

The trouble with depending on feathering is not doing it. Hands jerk, controls get bumped. That sort of thing, and then a tractor may end on its nose. More 3ph ballast may be a better solution than either hydraulic system re-jigging or feathering. However, a bunch of stress to the chassis results from dropping heavy buckets when the 3ph has big weight. It's good to ease heavy buckets down even if the tractor is stable.






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 11-24-2003, 06:28 Post: 69436
Art White



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 FEL Speed

Do you have any rear ballast?






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 11-24-2003, 06:36 Post: 69438
imtools



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 FEL Speed

Since speed is a function of flow and not pressure, I don't think that is the problem. The down direction will typically be faster, not only beacuse of gravity but the volume on the rod side of the piston is smaller and the same amount of fluid entering will cause more movement-hence faster.
I assume when you are going down you are referring to lowering the bucket to the ground and not lifting the tractor with the bucket on the ground. The latter is one condition where the pressure might be too high and blowing your seals.






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 11-24-2003, 08:38 Post: 69456
TomG

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 FEL Speed

Another way to get high cylinder pressures is using the bucket like a dozer. With the spooling valves closed oil is trapped in the cylinders and lines and circuit relief valves usually provide protection. The pressure settings for these valves may be much higher than the system relief setting. Using a loader for a dozer would tend to affect the bucket cylinder pressers more than the lift cylinders but it's still an issue. It's also pretty easy to break a loader frame doing that if the bucket is extended much.






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 11-24-2003, 20:04 Post: 69530
JParker

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 FEL Speed

So I shouldn't use my 4-in-1 bucket in the open position as a dozer blade to dig / level earth?

I was just about to start leveling a driveway. Admittedly I bought the 4-in-1 for moving brush and small trees, but I thought pushing dirt was also an option.

I was even about to price adding teeth to the bucket.

Would I be better off with a box blade for heavier scraping?






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 11-25-2003, 04:31 Post: 69550
imtools



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 FEL Speed

JParker
I think what TomG was referring to is that when you PUSH with the bottom of the bucket perpendicular to the ground, the forward force will try to move the bucket cylinder out (extend). This puts an unknown (and unprotected by relief valve) amount of pressure on the rod seals. If you PULL (scrape), the force is the other way around and does directly affect the bucket cylinder rod seals.

The lift arm cylinders are loaded in the opposite direction but because of their angle, the negative effect is not nearly as pronounced.






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