rambler
Veteran Member
- Joined
- Jul 6, 2003
- Messages
- 1,994
- Location
- MN
- Tractor
- Ford 960, 7700, TW20, 1720; IHC H, 300; Ollie S77
</font><font color="blue" class="small">( </font><font color="blueclass=small">( The maximum operating pressure spec on any hydraulic cylinder needs to be matched to the application, not blown off as insignificant. )</font>
First of all, read my posts. I never said that this wasn't true. My point was with the pin diameter and the fact that commonly available cylinders, be they 2500 psi or 3000 psi, all use the same pin diameter from 2" thru 3-1/2" bores. If pin diameter vs bore size vs PSI was really significant for this application, then don't you think the cylinder manufacturers would build cylinders with pin diameters that would get larger as the bore or psi got larger?
Pin diameter is the least of the posters problems and using either 1" or 1-1/8" has no bearing on this issue other than his backhoe uses a non-standard pin size and the fact that machining might be necessary if he chooses a standard cylinder.
)</font>
Mad, I always like your posts, learn a lot from you.
I would be concerened about shimming down to a weaker pin. I understand your point that bigger cylinders use the same pin, so this cylinder shouldn't overstress the pin.
However, a backhoe can add a _lot_ of stress to this cylinder with the bucket curl setup. That stress can go above any normal stress the cylinder could create upon itself. The fact that the cyl rod busted is evidence this cyl can recieve more stress than it normally would give itself.
I'm thinking due to the external stress from the buckt curl, perhaps in this case one should be careful on going to a smaller pin?
Does that make some sense?
As to 2500 vs 3000, the 3000 will probably be built tougher, & looking at the picture, I guess I'd want tougher. /forums/images/graemlins/smile.gif Either model should handle the tractor's psi, but tougher looks better for this use. /forums/images/graemlins/smile.gif
--->Paul
First of all, read my posts. I never said that this wasn't true. My point was with the pin diameter and the fact that commonly available cylinders, be they 2500 psi or 3000 psi, all use the same pin diameter from 2" thru 3-1/2" bores. If pin diameter vs bore size vs PSI was really significant for this application, then don't you think the cylinder manufacturers would build cylinders with pin diameters that would get larger as the bore or psi got larger?
Pin diameter is the least of the posters problems and using either 1" or 1-1/8" has no bearing on this issue other than his backhoe uses a non-standard pin size and the fact that machining might be necessary if he chooses a standard cylinder.
)</font>
Mad, I always like your posts, learn a lot from you.
I would be concerened about shimming down to a weaker pin. I understand your point that bigger cylinders use the same pin, so this cylinder shouldn't overstress the pin.
However, a backhoe can add a _lot_ of stress to this cylinder with the bucket curl setup. That stress can go above any normal stress the cylinder could create upon itself. The fact that the cyl rod busted is evidence this cyl can recieve more stress than it normally would give itself.
I'm thinking due to the external stress from the buckt curl, perhaps in this case one should be careful on going to a smaller pin?
Does that make some sense?
As to 2500 vs 3000, the 3000 will probably be built tougher, & looking at the picture, I guess I'd want tougher. /forums/images/graemlins/smile.gif Either model should handle the tractor's psi, but tougher looks better for this use. /forums/images/graemlins/smile.gif
--->Paul
