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8.2.12 Turret rotation game control.
According to the periodicity described in the maintenance table, check the play of the turret rotation
system. The turret rotation system used on ALMAC machines makes it possible to have no play at the base
of the rotating turret by applying horizontal forces to the platform.
To check the correct horizontal play of the turret rotation, it is therefore sufficient, with the arm
completely closed, to push horizontally on the platform to check that the base of the turret has no play
in the horizontal direction.
To check the vertical play of the turret rotation it is necessary, with the arm completely closed, to swing
the platform up / down and check that the base of the turret has no play in the vertical direction. Any
vertical oscillations are a sign of internal wear of the fifth wheel.
If the operator finds a defect that can generate dangerous situations or suspects that there may be
malfunctions, the machine must be placed in a safe condition (isolate it, apply a sign) and report the
anomaly to the employer and to contact an authorized service centre.
8.2.13 Platform rotation game control.
According to the periodicity described in the maintenance table, check the clearance of the platform
rotation system.
The platform rotation system used on the ALMAC machines allows for minimum games on the platform
rotation. The rotation actuator or the cylinder is held in position by an over-centre valve directly flanged
on the component or rigidly connected in the vicinity of the same.
If applying a horizontal force to the platform, the latter does not remain fixed in position, there may be
air in the component; it is sufficient to command two / three platform rotations at the end of the stroke
to eliminate the air present and restore the system to work properly. If the play remains even after this
last operation, the component may be defective.
If the operator finds a defect that can generate dangerous situations or suspects that there may be
malfunctions, the machine must be placed in a safe condition (isolate it, apply a sign) and report the
anomaly to the employer and to contact an authorized service centre.
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