the leaking cylinder yes is single acting right side (moco 630) ...and seems to be like (11) ...am i missing a gland in (11 diagram) ? thats kinda what has me stumped no threads are showing in the gap on the leaking cylinder i guess theoreticly i could just attempt to screw the (gland?) back in ? (i am used to gland types having a set screw etc)The left side header lift cylinder(7)(the side that is leaking) is double-acting and the right side(11) is single-acting.
The left side cylinder part number AHC13777. The seal kit looks to be part number DC202990.
From the lower photo you posted, the gland seems to have loosened and backed away from the barrel, causing the leak.
You should be able to unscrew the gland(2) from the cylinder barrel(5) to replace the seals/o-rings.
trust me on the rights n lefts ...pictures sure look different...(cylinders set outside the inboard wheels)