A tractor front linkage quick attach coupling system for interlocking atractor to a tool front linkage assembly. Thecoupling system comprises linkage assembly anchoring arms engagingcomplementary tractor inclined ramps. The arms have notchesengaging upper rim members and lower cam members. The cam members are movablebetween arms/ramps locking/unlocking conditions.A cam member release preventing safety device is provided, to preventaccidental release of the coupling system. This safetydevice includes sliding stops, over-center compression spring mountedconnector rod members, a transverse link, a push link and ahand lever for deactivating the safety device.
