Thank you sir.In a quick internet search I found three manuals Hope it helps.
Bobcat 873 (S/N 514115001 & Above) Service Manual, 471 pages
Bobcat 873 Turbo (S/N 514140001 & Up, 514240001 & Up, 517911001 & Up) Service Manual, 968 pages
Bobcat 873 (S/N 514114999 & Below) Service Manual, 510 pages