Yanmar B30V

[DJT]

Hi All

Im having an issue with my yanmar B30v
I have a slow main ram and bucket ram,
Checking at the valve chest get over 3k psi when the ram reaches full extension or closure,

However I notice a small pipe, see highlighted in pic , that oil seems to flow through when ram is in movement , maybe an overflow or bypass ?
Anyone have any suggestions, pump is good

 

[Mick-the-fitter]

Photo of the ram please

 

[DJT]

Photo of the ram please

Hi Mick-the-fitter, see pic of rams highlighted ram on right side seems to be the main issue, but the bucket ram is also affected,

 

[DJT]

View attachment 74927
Hi Mick-the-fitter, see pic of rams highlighted ram on right side seems to be the main issue, but the bucket ram is also affected,

So checked the valves and washed just to be sure, they seem fine, bucket curl is pretty much ok,
The ram on the right will lift, and once the handle is released it will drop maybe 300 to 400mm and stop, same if lifting or lowering

 

[DJT]

View attachment 74927
Hi Mick-the-fitter, see pic of rams highlighted ram on right side seems to be the main issue, but the bucket ram is also affected,

Swapped pipes from right hand ram with top ram, same result, in right hand ram ,
Im assuming a blown seal in the ram and am going to open the ram

 

[DJT]

So, opened ram and seal is split and damaged, going to get a set of seals and reassemble

 

[Mick-the-fitter]

Ok can you show me the other side of the rams where the pilot valve blocks are

 

[DJT]

Hi Mick
All sorted back running as normal
Thanks again