Quick coupler / Coupler :
Device mounted on an earthmoving machine, which allows the quick interchangeability of accessories.
Coupler and quick coupler are the same devices. In this text, the term "quick coupler" will be used.

Engagement system :
The quick hitch mechanical system engages the accessory and keeps it in working position.

Locking system :
A system which ensures that the attachment is retained in its working position, in case of engagement force is lost or diminished.

There are 3 categories of prescriptions :

• General
• According to the type of engagement
• According to the location of engagement

Two families, according to the accessory :

• Universal couplers : quick couplers that take the accessories by the 2 original pins. Synonyms : adapters, non-dedicated couplers 

• Dedicated quick couplers : quick couplers that take the accessories through a compatible system, specifically designed.

 

Three categories, according to the operation :

• MIXED quick coupler : engagement and locking are ensured from the cabin but the disengagement is executed by human effort on the quick coupler.

 

• PILOTED quick coupler : the movements of any element of the engagement and locking system are made by an energy source (ex mechanic, hydraulic, electric).

• MANUAL quick coupler : the movements of the engagement and locking system are made by human effort on the quick coupler itself.

The design of a quick coupler with engagement from the operator’s station
in combination with a manual safety system (ex. a locking pin)
is prohibited !

NOTE : This prevents unexpected detachment of the accessory due to the non-use of the locking mechanism.