To answer your question about the lifting capacity of the 3 point hitch, the 184 Operators manual (154 should be rated the same) states that the lifting capacity is 525 pounds at 24" behind the hitch point. See attached specification page;
I believe that the system relief valve is located within the the control lever valve and is factory preset and thus is non-adjustable.
I would make sure that the hydraulic oil is clean and hy-train compatible and that the filter is clean. The best way is just to drain the system, replace the hydraulic filter and refill to the plug level that is located on the rear of the differential cover plate with new Hy-train compatible oil. (NAPA carries compatible hydraulic oil). You may have to cycle both cylinders through 5 or 10 times to get all the air out.
Hope that this helps you, NJDale
You do not have the required permissions to view the files attached to this post.