Hyd. problem i cant figure out

[59ih340]

Oh man ... yeah that hurts.
In my earlier post I was going to mention maybe something happened to the pump, but since it worked fine before, I figured that would not be it.
Big mistake! Sorry man.
How do you suppose THAT happened and when?

I think maybe the erratic hydraulics I thought was a worn valve may have been the pump failing.And when the system lost it's prime it just woudn't come back. It seems a little odd too, the way the pump cracked. The crack runs straight down, and divides 50/50. It almost looks like sometime in it's "history",the pump may have been apart and reassembled poorly? Like one side was tightened.then the other side? It's odd,but it's old..so who knows.

 

[SPYDERLK]

I think maybe the erratic hydraulics I thought was a worn valve may have been the pump failing.And when the system lost it's prime it just woudn't come back. [[[It seems a little odd too, the way the pump cracked. The crack runs straight down, and divides 50/50. It almost looks like sometime in it's "history",the pump may have been apart and reassembled poorly? Like one side was tightened.then the other side? It's odd,but it's old..so who knows.]]]

I looked back at your picture. That looks like the preferred failure point of the design. It is the longest chord across the face and interrupted by the shaft hole. Lots of stresses and varying thicknesses. A challenge to make it last forever with all the pressure cycling. Needs to be steel rather than die cast.
larry

 

[true temper]

Was the engin hard to start after instaling the first valve? Mabe the replacement valve wes closed centre valve and the oil had no where to go, breaking pump.

 

[59ih340]

Was the engin hard to start after instaling the first valve? Mabe the replacement valve wes closed centre valve and the oil had no where to go, breaking pump.

No hard start,but it's a "true" 50hp. class tractor. That pump is no match for that big 6 cyl.
I think age/misuse may be responsible for the pump failure.