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Hydraulics question.

B

Blackstack

Member
I have a loader on a 460 Farmall. When I drop my loader and it hits ground it always takes 2-3 seconds to get down pressure. I've had other hydraulics issues that I think I have resolved so I always assumed it was just air in the cylinders. But what if a vacuum is created on the down pressure side of the cylinders because the fluid doesn't flow to them fast enough on the free fall down and the 2-3 seconds is just the time it takes to fill that side of the cylinders with fluid that takes the place of the vacuum? Is that the case? If it is the case with our old obsolete tractors how do they prevent this on modern equipment?
 
To answer your question of how they avoid that on other equipment, they use anti cavitation valves in the control valves.
 
You gave the cause. The weight of the bucket forces the oil out faster than what the pump replaces it. I can ask at work tomorrow, my boss is a former IH service manager, but you should have an adjustment for this. If not you can get an external flow control. Over a period of time this causes cylinder caviation and will cause the cylinders to pit.
 
I've always assumed that's what's happening. On both of my loaders,it happens with the bucket cylinders. They dump and return OK,but it I use down pressure on the bucket itself,it will do just what you describe and takes a few seconds before it'll start to tip back up.
 
Does the average aftermarket loader control valve have them or are they normally only found on higher end equipment?
 
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