BIGDAN315
Well-Known Member
- Joined
- Jan 29, 2008
- Messages
- 229
- Location
- Newark, NY
- Occupation
- Self employed in the excavating buis and have been
I just built a hydraulic thumb for my Kamatstu pc 40 excavator. The problem is I can't get it to retract on its own.It has to be pushed back by the bucket.No problem clamping though. Of course the machine has auxsillary hyd. WHen I try to retract or pull back the thumb it just sits there and sounds like the pressure reliefe valve is dumping?
Any body have any inputs on what might be wrong ? I have used it the way it is but a bit of a pain when the thumb does not stay all the way back. Otherwise it works just fine.
Any body have any inputs on what might be wrong ? I have used it the way it is but a bit of a pain when the thumb does not stay all the way back. Otherwise it works just fine.