Swing Cylinders B134 New Holland Backhoe Attachment

[Rayhat]

So as long as I'm on here, I just had my two swing cylinders professionally rebuilt. When I re-installed them they work In reverse. I.E. swing left when I activate the swing right valve and visa versa, and I think they have air in them because when they each reach around 70 degrees of travel from 90 degrees (center position) they drop the rest of their travel to zero degrees, and have no power to swing back. This will occur whether I swing left or right. Since the four lines are balanced to each cylinder (left swing- right swing) I'm having trouble bleeding them. Is there some particular procedure I need to follow to bleed the swing cylinders.
It's lines 14 in the diagram
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[JamQwe56]

So as long as I'm on here, I just had my two swing cylinders professionally rebuilt. When I re-installed them they work In reverse. I.E. swing left when I activate the swing right valve and visa versa, and I think they have air in them because when they each reach around 70 degrees of travel from 90 degrees (center position) they drop the rest of their travel to zero degrees, and have no power to swing back. This will occur whether I swing left or right. Since the four lines are balanced to each cylinder (left swing- right swing) I'm having trouble bleeding them. Is there some particular procedure I need to follow to bleed the swing cylinders.
It's lines 14 in the diagram
.

View attachment 9307

Yeah, sounds like classic swapped lines + air in the system. If it’s swinging opposite, the ports are likely crossed somewhere. And that drop near the end of travel definitely points to air or cavitation.

Try slow full cycles left/right a bunch of times at low idle and make sure fluid level is good — they usually self-bleed. If it still does it after that, I’d start questioning the rebuild or a trapped air pocket