Permitted wear for Towing Hitches and Drawbar eyes

Automatic couplings – bearing (turning knuckle)

Gap at turning knuckle:
between funnel and flange collar under light load on the lower tab in driving position: max. 3 mm


Non-automatic couplings – bore

Gap at turning knuckle:
between funnel and flange collar under light load on the lower tab in driving position: max. 3 mm


Automatic couplings – coupling pin


Diameter

Type Nominal dimension (mm) Wear limit min. (mm)
274 30 – 31.5 28
800 30 – 31.5 28
810 30 – 31.5 28

max. 2.5 mm


no deformation of the safety components

max. 6 mm


Wear of the coupling pin or of the bore max. 1,5 mm


Non-automatic couplings – bore

Top and bottom in drive position max. 35 mm oval


Insert pin bearing

  • Pin play in the bore max. 3 mm (nominal dimension whennew 0.5 mm)
  • Wear of the pin max. 1.5 mm
  • Wear of the bore 1 mm or vice versa

Lift bearing

  • Play in guideway in push/pulldirection max. 2.4 mm
    (nominal dimension when new 0.4 mm atan installation dimension 330 mm)
  • Wear of the groove in hitch holder max. 1.2 mm
  • Wear in the guideway of the trailerhitch 0.8 mm or vice versa

Drawbar eyes

ISO DIN b2 max. (mm) c min. (mm) e3 min. (mm)
5692-2 11026 41.5 38 22
- 11043 41.5 311 22
8755 74054 41.5 28 22
8755 74054/2 (without bush) 44.0 28 24
1102 74053 52.5 41.5 23.5
5692-1 9678 52.5 27.5 27

1 New dimension in hump area 35 mm
2 Dimension with bush
3 Dimension without bush