Today I picked up a 1/2 bucket of really wet 3/4 minus gravel for a project I have going on. The loader would not pick up the load more than 5' off the ground. Wondering if i'm low on fluid or my Hyd. Pump is worn out. I thought tomorrow I would add more hyd. fluid and see what it does. Also I will try bleeding the pump and see what that does. Any thoughts would be greatly appreciated
- Thread starter nashranch
- Start date
Sean in PA
Well-known Member
If it lifts higher than that when there's nothing in the bucket then the fluid level shouldn't be the problem. More likely a leaking internal seal either in the control valve or a cylinder, or possibly the pump needs to be rebuilt.
Sean in PA
Well-known Member
I was talking about an internal leak across the internal piston seal/o-ring, from one side of the cylinder to the other, so there would be no external sign of a leak.
I guess I assumed that since you only mentioned the lift being weak that the bucket curl was still strong, but you know what happens when you assume. Does the bucket curl fine with the heavy load? If the bucket curl is also weak then I would suspect the relief valve as Wayne mentioned, but if the bucket curl cylinder is still strong then I would suspect an internal leak as I first mentioned.
Sean in PA
Well-known Member
The relief valve is inside the loader control valve. Its purpose is to protect the rest of the system by opening if the pressure goes above some preset amount. The relief valve in most loader control valves are usually set to open at around 2000 to 2200 psi.
If you don't know a lot about hydraulic systems and do not have the proper tools, your best bet is to remove the entire control valve from the loader and take it to your local hydraulics shop and ask them to test it. Likewise with the individual cylinders, you can remove them and have a hydraulics shop test them as well, and they can rebuild the control valve and/or the cylinders if needed.
If you don't know a lot about hydraulic systems and do not have the proper tools, your best bet is to remove the entire control valve from the loader and take it to your local hydraulics shop and ask them to test it. Likewise with the individual cylinders, you can remove them and have a hydraulics shop test them as well, and they can rebuild the control valve and/or the cylinders if needed.
Today I finally emptied the heavy wet 3/4 minus from the bucket. Checked oil in loader. Was not prepared for the gusher of oil that came out of the drain plug. The oil looked good with no water in it. The bucket raises ok with no load but seems slow as compared to how fast it drops(Is this normal??) At one point it sounded like there was air in there. I don't see how to bleed the hyd. pump. I raised and lowered the bucket a bunch of times to see if that made any difference, saw no improvement.
Sean in PA
Well-known Member
I am not familiar with that control valve, but it looks to be made by Gresen. In looking around at other similar control valves on Google, that area where your arrow is pointing does appear to be where the relief valve is located.
The only exploded view I could find of one like that shows an adjusting screw under that cap nut, but unless you are sure of what you are doing and have the proper gauges I wouldn't attempt to adjust it, as hydraulics are very powerful and an improper adjustment could cause something to fail catastrophically and damage something or someone (likely you).
If it is the relief valve that is bypassing at too low of a pressure, the chances are good that something inside needs to be replaced rather than just be adjusted.
The only exploded view I could find of one like that shows an adjusting screw under that cap nut, but unless you are sure of what you are doing and have the proper gauges I wouldn't attempt to adjust it, as hydraulics are very powerful and an improper adjustment could cause something to fail catastrophically and damage something or someone (likely you).
If it is the relief valve that is bypassing at too low of a pressure, the chances are good that something inside needs to be replaced rather than just be adjusted.
Sean in PA
Well-known Member
If you can get the exact model number off of the control valve you might be able to find a manual for it on line. I found a few manuals for various Gresen models when i was searching. The manual should tell you how to do the adjustments for the relief valve.
As I said earlier, since the bucket curl seems strong, the relief valve isn't the most likely culprit.
As I said earlier, since the bucket curl seems strong, the relief valve isn't the most likely culprit.
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