Jost

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

Automatic couplings – coupling pin

Diameter

Type Nominal dimension (mm) Wear limit min. (mm)
840 38.6 ± 0.1 36
850 30.6 ± 0.1 28.6
860 38.6 ± 0.1 36
873 38.6 ± 0.1 34

Vertical clearance: max. 2.5 mm

 

Clearance in the lower pin guideway max. 2.5 mm: Wear of the coupling pin or of the bore max. 1.5 mm

Non-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 – single hand 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  

Safety device: no deformation of the safety components

Permissible clearance: max. 6 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

ISODINb2 max. (mm)c min. (mm)e3 min. (mm)5692-21102641.53822-1104341.53112287557405441.52822875574054/2 (without bush)44.0282411027405352.541.523.5


CONTACT

Gümaş Otomotiv Sanayi ve Ticaret A.Ş.
Taksim Cad. No:33/A 34437,
Taksim - İstanbul

t: 0212 254 78 05
f: 0212 256 17 86 e-mail: info@gumas.com.tr