All the o-rings are easy to find, if your plunger is worn that might be a problem. Are you having a problem knowing the order to put the bolt, springs, and washers back together?
I recently uploaded to the library " Servicemen's Reference Book Caterpillar Hydraulic Controls and Equipment "
Covers a lot on No. 44 Hyd Controls
No. 46 Hyd Controls
Hyd cyl for bulldozers and implements
No. 40 Hyd Controls scrapers hyd cyl and valves
Flow diagrams
Flow diagrams for the No. 41 Hyd Controls
Hope it helps