chacho
Plastic
- Joined
- Jul 15, 2009
- Location
- Mexico, Monterrey
Good night everyone!
We need to install a drawtube on our Doosan Puma 700L. We took the original drawtube out from the chuck side; it has slots at the end face that allow it to be screwed or unscrewed to the hydraulic cylinder (Samchully SDL-30516). This original drawtube came our very easily and there were no signs of any adhesive on the thread – it is brand new and presumably factory installed.
We had an independent service tech visit and install the new drawpipe and chuck. We started machining a set of softjaws but noticed the chuck motion range to be decreasing after some clamp/unclamp cycles – the drawtube became loose from the cylinder. Fortunately, it was softjaws we were machining and not a clamped part that would have flown off.
We called the tech, and he was no help. I don’t believe he tightened it enough when installing and he admitted to not verifying if the whole thread was screwed in/engaged at any time.
Neither the Samchully hydraulic cylinder nor the chuck manual make any note of Loctite being applied at the thread and there is no locknut either. Am I missing something? How is this assembly prevented from unscrewing?
Does anyone have experience with these cylinders? Do I need to use Loctite or just make sure it is properly tightened? I would like to avoid gluing the drawtube and cylinder together if unnecessary, it could complicate disassembly in the future as this is a large machine.
Thanks for your help!
We need to install a drawtube on our Doosan Puma 700L. We took the original drawtube out from the chuck side; it has slots at the end face that allow it to be screwed or unscrewed to the hydraulic cylinder (Samchully SDL-30516). This original drawtube came our very easily and there were no signs of any adhesive on the thread – it is brand new and presumably factory installed.
We had an independent service tech visit and install the new drawpipe and chuck. We started machining a set of softjaws but noticed the chuck motion range to be decreasing after some clamp/unclamp cycles – the drawtube became loose from the cylinder. Fortunately, it was softjaws we were machining and not a clamped part that would have flown off.
We called the tech, and he was no help. I don’t believe he tightened it enough when installing and he admitted to not verifying if the whole thread was screwed in/engaged at any time.
Neither the Samchully hydraulic cylinder nor the chuck manual make any note of Loctite being applied at the thread and there is no locknut either. Am I missing something? How is this assembly prevented from unscrewing?
Does anyone have experience with these cylinders? Do I need to use Loctite or just make sure it is properly tightened? I would like to avoid gluing the drawtube and cylinder together if unnecessary, it could complicate disassembly in the future as this is a large machine.
Thanks for your help!