USER MANUAL Tractor semitrailers PTL 28Fitting Column Wrench Wheel hole Hub centre Wheel centre IllustrationD1 (mm) mm D2 (mm) D3 (mm) D4 (mm)8 x Ø 275 M 18 x 1,5 29 21.5 220 221 510 x Ø 335 M 22 x 1,5 32 27 280 281 5Table 15. 5 illustration‘s tightening informationFitting Column Wrench Wheel hole Hub centre Wheel centre IllustrationD1 (mm) mm D2 (mm) D3 (mm) D4 (mm)8 x Ø 275 M 20 x 1,5 28 27 220.5 211 6 – 710 x Ø 225 M 22 x 1,5 32 27 175.5 176 6 – 710 x Ø 335 M 22 x 1,5 32 27 280.5 281 6 – 710 x Ø 335 M 24 x 1,5 36 27 280.5 281 6 – 7Table 16. 6 – 7 illustrations‘ tightening informationPicture 12. Wheel mounting with centring on hub can be facilitated by the introduction, at least in two columns, of theindicated centring rings, reference 1 in the illustration. This is useful especially when mounting twin wheels since the disc offset couldmake hub positioning problematic.7.1.2. Maintenance of axlesConstantly check the tightening of the hub covers. Any lost or damaged cover must be replaced inorder to protect the hub against the penetration of dirt. When replacing screw-able covers, the spacer shouldalso be replaced. The cover shall be tightened up regularly (every 3 months).Picture 11. Mount with centric on hub