I have bought a sr70 asv and want to ask a question about the hydrolics. I don't think I have the lifting power that I should. How do you know for sure. When I was going to pull a post out of the ground and I hooked on and lifted it seems as if it just goes so far and will not just keep lifting. Shouldn't it just either rip it right out of the ground or just raise the loader up off the ground with no problem? Can a pump be adjusted or what would be wrong? I see no leaks anywhere, the machine only had 425 hours on it. Is the pump trashed? It has all moveability by the same pump and it seems to go just fine. Any suggestions? Thanks
ASV question
- Thread starter jus4fun2
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J_J
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- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
jus4fun2 ,
If your pump is working at 100 %, and the cylinder are good, then it should either work as expected or go into relief. If it does neither, several things could cause this. A good system will lift the rear off the ground.
Weak pump, valve leaking, cylinders bypassing. Best thing I tell everybody is to get a hydraulic gage, and use it for troubleshooting.
If your pump is working at 100 %, and the cylinder are good, then it should either work as expected or go into relief. If it does neither, several things could cause this. A good system will lift the rear off the ground.
Weak pump, valve leaking, cylinders bypassing. Best thing I tell everybody is to get a hydraulic gage, and use it for troubleshooting.
J_J, It seems like if I go to tilt the bucket up when I try to pry on something it will start to come up like it should but then its just like it hits a wall and it just sits there not finishing the cylinder out the rest of the way. I don't know but it just does not seem to be working at full power. I thought if I increased the rpms to full throttle it would help the pump operate better, but it just won't lift any farther. Do you think it would be a major expense to figure out where the problem would be? It's a funny thing because it will bring the back of the skid loader up when I do some things and I think the hydro is all with the same pump so I really just don't know. It says something about maximum system pressure 3000psi. If I don't have that then what? I had everything pa rt to see if I could find a leak and I see nothing major anywhere, maybe a slight seep out of a cylinder or two. I just don't know much about hydraulics so any help is much appreciated! Thank you
J_J
Super Star Member
- Joined
- Sep 6, 2003
- Messages
- 18,952
- Location
- JACKSONVILLE, FL
- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
jus4fun2,
To find the problem will be minor.
First get a gage. With it, you can track down what the pressure is at any point. The first pressure test would be off the pump, or pumps, and you might have one or two.
With the engine running and no work happening, you will not read much pressure. You only see pressure when you throw a lever, and activate a circuit. For instance, if you put a tee fitting before the FEL valve, and put a QD on the tee, QD on the gage, you just plug in the gage, watch what is happening to the hydraulics when you activate a valve, and causing something to work.
If your pump is putting out 3000 psi, and you try and lift your max load, then the gage will read a pressure around 2800 psi, which is set by the relief valve to protect the cylinders. Other things that could cause problems is a leaky valve, and hyd cylinders that are bypassing.
When I was having trouble with the lifting, I knew it was only about half of the capability, and since the cylinders were leaking a little, I rebuilt the cylinders. Did not fix the problem. Took the valve off and took it to a hydraulic shop and had them test it, checked good. Only thing left was the pump. Bought new pump, and guess what, back to original capacity. A lot of expense fixing hydraulics is in the labor, so if you can find the the trouble, you should be able to fix it.
Rpm determines the GPM, and speed of movement. Pressure is available as soon as the pump is turning. The fluid just recirculates until a valve is activated, and then work is being done. .
To find the problem will be minor.
First get a gage. With it, you can track down what the pressure is at any point. The first pressure test would be off the pump, or pumps, and you might have one or two.
With the engine running and no work happening, you will not read much pressure. You only see pressure when you throw a lever, and activate a circuit. For instance, if you put a tee fitting before the FEL valve, and put a QD on the tee, QD on the gage, you just plug in the gage, watch what is happening to the hydraulics when you activate a valve, and causing something to work.
If your pump is putting out 3000 psi, and you try and lift your max load, then the gage will read a pressure around 2800 psi, which is set by the relief valve to protect the cylinders. Other things that could cause problems is a leaky valve, and hyd cylinders that are bypassing.
When I was having trouble with the lifting, I knew it was only about half of the capability, and since the cylinders were leaking a little, I rebuilt the cylinders. Did not fix the problem. Took the valve off and took it to a hydraulic shop and had them test it, checked good. Only thing left was the pump. Bought new pump, and guess what, back to original capacity. A lot of expense fixing hydraulics is in the labor, so if you can find the the trouble, you should be able to fix it.
Rpm determines the GPM, and speed of movement. Pressure is available as soon as the pump is turning. The fluid just recirculates until a valve is activated, and then work is being done. .