council direct approxim law member state relat steer equip wheel agricultur forestri tractor eec council european commun regard treati establish european econom commun articl thereof regard propos commiss regard opinion european parliament regard opinion econom social committe technic requir tractor compli pursuant nation law relat inter alia steer equip requir differ member state member state adopt requir addit place exist rule order eec type approv procedur subject council direct eec march approxim law member state relat type approv wheel agricultur forestri tractor appli respect type tractor adopt direct articl quot agricultur forestri tractor quot mean motor vehicl fit wheel caterpillar track axl main function li tractiv power special design tow push carri power tool machineri trailer intend agricultur forestri equip carri load passeng direct appli tractor defin preced paragraph fit pneumat tyre axl maximum design speed kilometr hour articl member state refus grant eec type approv nation type approv tractor ground relat steer equip satisfi requir set annex articl member state refus registr prohibit sale entri servic tractor ground relat steer equip satisfi requir set annex articl amend adapt requir annex technic progress adopt accord procedur laid articl direct eec articl member state bring forc provis order compli direct month notif forthwith inform commiss thereof member state ensur text main provis nation law adopt field cover direct commun commiss articl direct address member state brussel council presid ryan oj oj oj annex definit quot steer equip quot quot steer equip quot mean equip purpos alter direct movement tractor steer equip consid includ steer control steer gear steer wheel applic special equip produc addit independ power quot steer control quot quot steer control quot mean part directli oper driver order steer tractor quot steer gear quot quot stear gear quot mean compon steer control steer wheel except special equip refer steer gear mechan hydraul pneumat electr combin quot steer wheel quot quot steer wheel quot mean wheel align alter directli indirectli relat tractor order obtain chang direct movement tractor wheel articul tractor wheel axl speed vari order obtain chang direct movement tractor track castor wheel steer wheel quot special equip quot quot special equip quot mean part steer equip addit independ power produc addit independ power produc mechan hydraul pneumat electr system combin oil pump air pump batteri quot type steer equip quot depend sourc power deflect steer wheel type steer equip identifi manual steer equip steer power provid sole muscular power driver assist steer equip steer power provid muscular power driver special equip refer steer equip steer power provid sole special equip refer event failur special equip enabl muscular power driver steer consid quot assist steer equip quot servo steer equip steer power provid sole special equip refer steer effort quot steer effort quot mean forc exert driver steer control order steer tractor construct fit inspect requir gener requir steer equip ensur easi safe handl tractor compli detail requir set detail requir steer control steer control easi grip design permit gradual deflect direct movement steer control correspond desir chang direct tractor steer effort requir achiev turn circl radiu start straight ahead posit exce dan case assist steer equip auxiliari power suppli fail steer effort requir exce dan order check complianc requir tractor describ spiral movement speed kilometr hour start straight ahead posit dry flat road surfac offer good tyre adhes steer effort steer control note reach posit tractor enter turn circl radiu durat manoeuvr time moment steer control oper moment reach posit measur exce second normal case second special equip fail manoeuvr made left test tractor load technic permiss maximum weight tyre pressur weight distribut axl conform manufactur instruct steer gear steer equip includ electr wholli pneumat steer gear steer gear design meet oper requir easili access mainten inspect case steer gear wholli hydraul drive tractor event failur hydraul pneumat compon steer gear steer gear oper pure hydraul special equip mention meet requir pressur limit devic protect part circuit excess pressur pressur limit devic set exce pressur equal maximum oper pressur state manufactur characterist dimens pipe work pipe withstand time pressur permit pressur limit devic protect place arrang risk damag impact interfer reduc minimum risk damag rub consid neglig steer wheel wheel steer wheel special equip special equip defin type steer equip defin accept circumst tractor equip assist steer equip defin drive event failur special equip state assist steer equip sourc power fit power reservoir power reservoir replac contain devic provid power suppli steer equip prioriti system link common energi sourc steer brake system common sourc energi sourc power compress air air reservoir protect return valv steer power provid sole special equip refer assist steer equip fit devic event failur special equip steer effort exce dan visual acoust signal give warn failur tractor fit servo steer equip defin provid equip wholli hydraul steer gear special devic fail carri manoeuvr special addit devic special addit devic compress air ga reservoir oil pump compressor special addit devic devic work rotat tractor wheel disconnect event failur special equip visual acoust signal give warn failur special devic pneumat fit compress air reservoir protect return valv capac compress air reservoir calcul complet turn lock lock reservoir pressur fall half oper pressur test carri steer wheel ground