MASSEY FERGUSON 5400 - Operating Principle of the Dromone Retractable Hook

Massey Ferguson 5400 - Issue 1.a
06G01.9
GPA20 hitch hooks
D . Operating principle of the
Dromone retractable hook
Construction (Fig. 8)
The auto-hitch assembly comprises a main bracket (2)
attached to the centre housing and a mobile plate (1)
that can be raised or lowered via the adjustable tie-rods
(3) of the linkage system.
Operation
Plate lowered
When the system is unlocked by the lever in the cab
(Fig. 5), the mobile plate (1) can be lowered to ground
level by the linkage system. Once the tractor is in posi-
tion, the trailer can be hitched on.
Plate raised
In this configuration, the locking safety of the retract-
able hook is ensured at maximum retraction, with the
plate (1) (Fig. 8) previously raised and engaged.
The principle involves two mechanical locks located at
the rear of the main bracket. When the previously
stated conditions exist, the lock screws enter their
respective recesses in the retractable hook and
prevent any untimely movement.
N
OTE: When entering the safety position, the locks
must audibly click during maximum hook retraction.
N
OTE: When retracting of the hook, the operator in the
driving seat should check that the gear shift and hand-
brake levers are in neutral position. This facilitates the
tractor / trailer hooking manoeuvre and frees it from
any constraints.
N
OTE: Periodically grease the safety lock mechanism
and the mobile plate control cable.
Fig. 8