Hi guys,
Thanks for the interesting comments, I am always learning something new. When clearing snow using both the TPH snow blower and the FEL, it is normal for both to be in the raised position when moving from one place to another. I have done that for years and don't think that is the cause of the pump blowing. Having said that, the TPH blower isn't raised any higher than needed, whereas the FEL is used as needed. Obviously when blowing snow the blower is on the ground and the FEL usually a couple of feet off the ground - high enough to clear the newly cleared snow edges of the driveway/road.
I am thinking that the cause was probably the QD's connects though I will never know for sure.
To add to my other comments, I have now installed a pressure gauge and the original Jinma QD's have the internals removed and are now open.
I will put in an extrenal relief valve along with a dedicated dump line back to the hydraulic oil tank. I still have to make up my mind on where to connect the relief v/v return at the tank - either at the drain or at the top of the tank.
Thx
Jim