Hi,
Manuals for that machine may be hard to come by since it was last made 20 years ago. You can of course purchase one from Deere at:
John Deere Ag - New Equipment: Technical Publications - Publications Search
For some info see:
TractorData.com John Deere 185 tractor information
Or buy it here:
John Deere 185 Service, Repair & Owners Operators Manual Shop
Prices can vary and you may wish to try Ebay.
Peace,
Clarke