External Hydraulic on tph

Jaypat88

Member
I am curious for what purpose does this hydraulic serve (see pic) other than raising and lowering one hitch arm and what would I use it for?

My TPH was none responsive and I removed my Hydraulic lift cover for examination. I found that my Hydraulic cylinder was cracked (see pic). Does anyone know what would cause this, so I don't break the new one? I ordered a new cylinder and Hydraulic filter, is there anything else I should replace while I have the cover off? I also have drained all the fluid since it had water in it.

Thank you!
a151474.jpg

a151475.jpg
 

That extra cylinder will come in handy when using something like a grader blade or box blade when you want one side of a dirt driveway lower to accommodate water runoff. You can do it with the old hand crank style or do it on the fly with that cylinder on it. It's a good thing.
 
Nice to have when something like a box blade, had to use my grader blade last Saturday. I wished mine had a cylinder (but not that big) on it like that instead of having to crank on the adjuster. Probably what broke your lift cylinder, lucky it didn't break the lift cover.
 
(quoted from post at 00:09:35 02/14/17) Nice to have when something like a box blade, had to use my grader blade last Saturday. I wished mine had a cylinder (but not that big) on it like that instead of having to crank on the adjuster. Probably what broke your lift cylinder, lucky it didn't break the lift cover.

Does that extra cylinder somehow bypass the relief valve in the pump? Isn't the relief valve supposed to prevent cracking the cylinder like that?
 
In theory the relief valve should prevent this. They do go bad however. When you add external forces, like that external cylinder, you can cause a big spike in pressure inside the internal cylinder before the relief valve can function. As long as you are careful it "should" be ok.
 
Those lift cylinders are "blind" and fill/drain from the top. If (when) there is water in the system, the pump makes no differentiation between oil and water. Being that oil is lighter than water and the pump pulls near the bottom of the case, after a period of use, any fluid left in the lift ram is going to be mostly water. Parking it, particularly with the lift raised and having a cold night, it is entirely possible for the water to freeze and crack the cylinder.

According to the physical design of the system, the external cylinder has no bearing on the failure of the lift cylinder, though with water in the system, there may be damage to the external cylinder as well, such as swelled cylinder walls and leakage by the piston ring(s). That's my theory (puts mechanical pencil back in pocket protector and adjusts taped glasses).
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top