Mine worked fine for several years and now has this issue. Only way I can make the attachment work is to hold the toggle to the left. I found a post on this site that had the same issues but unfortunatly I did not save it and cannot find it again. But it said they had one of the spools hanging up.
I have a 863 Bobcat that when I put on my hoe attachment and engage the aux hydraulics they won't stay engaged unless you hold the slider switch to the left. I talked to Bobcat dealer yesterday and the parts guy convinced me it was the switch assembly. I bought it for $450 but on the way home...