J_J
Super Star Member
- Joined
- Sep 6, 2003
- Messages
- 18,928
- Location
- JACKSONVILLE, FL
- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
I am going to have to disagree to the valve holding ability.
If they all leak down, that is the manufacturer specification and I would call that an inferior valve.
If that were used on a job regulated by OSHA, they would ban that machine.
I certainly did not purchase my PT just for an inferior valve. That is not a feature anyone would want.
Excerpt:
If the hydraulic equipment has a leak (either internal or external), the performance efficiency will be directly (and dramatically) affected. For example, if the designed cycle time of an hydraulic circuit is 3 seconds, but the leakage causes the cycle time to slow to 6 seconds, the result will be reduction in performance efficiency of 50%.
Hydraulic System Leakage - The Destructive Drip
Now, you all can say that is the way it is, but you don't have to accept that.
If for example the avg leak down rate for most hyd sys is 10 drops per minute, and most manufacturer will replace a valve that leaks more than that under the warranty.
Then along comes the valves from PT, with a leak down rate of greater than 20 drops per minute.
Under the warranty, you have to live with their specs, but after the warranty is gone, you either live with it or replace the valve with a know good quality valve.
The PT loader valve is not that special.
I am surprised that Terry would say such a thing, like that is the way PT wanted it. We want a leaky valve so the lift arms will be on the ground ready to work.
Maybe the mining machines had it that way so they would not forget and run into the mine with the loader up.
I say, if you have a loader or any hyd, that is not to your liking, then fix it.
I doubt that PT has ever replaced a loader valve.
I removed my loader valve and had it tested to eliminate the leak down, and they said it was good.
At that time I did not know about the drops per minute, so I don't know if they did that kind of test.
I have no idea of the guide lines used in hyd shops as to testing for a go or no go on hyd components.
I am not even sure they test things they fix.
Have you ever seen a tag on a piece of equipment saying tested at 100 %. Meaning the pressure was good, and there was no leakage for 5 min at max pressure.
If they all leak down, that is the manufacturer specification and I would call that an inferior valve.
If that were used on a job regulated by OSHA, they would ban that machine.
I certainly did not purchase my PT just for an inferior valve. That is not a feature anyone would want.
Excerpt:
If the hydraulic equipment has a leak (either internal or external), the performance efficiency will be directly (and dramatically) affected. For example, if the designed cycle time of an hydraulic circuit is 3 seconds, but the leakage causes the cycle time to slow to 6 seconds, the result will be reduction in performance efficiency of 50%.
Hydraulic System Leakage - The Destructive Drip
Now, you all can say that is the way it is, but you don't have to accept that.
If for example the avg leak down rate for most hyd sys is 10 drops per minute, and most manufacturer will replace a valve that leaks more than that under the warranty.
Then along comes the valves from PT, with a leak down rate of greater than 20 drops per minute.
Under the warranty, you have to live with their specs, but after the warranty is gone, you either live with it or replace the valve with a know good quality valve.
The PT loader valve is not that special.
I am surprised that Terry would say such a thing, like that is the way PT wanted it. We want a leaky valve so the lift arms will be on the ground ready to work.
Maybe the mining machines had it that way so they would not forget and run into the mine with the loader up.
I say, if you have a loader or any hyd, that is not to your liking, then fix it.
I doubt that PT has ever replaced a loader valve.
I removed my loader valve and had it tested to eliminate the leak down, and they said it was good.
At that time I did not know about the drops per minute, so I don't know if they did that kind of test.
I have no idea of the guide lines used in hyd shops as to testing for a go or no go on hyd components.
I am not even sure they test things they fix.
Have you ever seen a tag on a piece of equipment saying tested at 100 %. Meaning the pressure was good, and there was no leakage for 5 min at max pressure.