Technical Library
- R69 Parts manual (German language) (published 1956) (40.8 MB)
- R69 parts manual (German language) (published 1961) (19.5 MB)
- Drive - Fitting of drive shaft housing cover on the models R50 and R69 (English language) (published 1955) (154.7 KB)
- (Bulletin #104) Suspension - Adjustment of tapered roller bearings on R26, R50, R60, R69 (English language) (published 1956) (811.6 KB)
- (Bulletin #123) General - Oil recommendation for summer 1957 (English language) (published 1957) (221.5 KB)
- (Bulletin #166) Engine - Valve guides (English language) (published 1959) (467.0 KB)