INSTALLATION, USE AND MAINTENANCE
GBA-GBP-CBE-MBE SERIES
72
6.4 Adjusting and regulating
6.4.1 Adjusting the rotation brake of the crane arm
REMAINING RISKS IF ON THE CRANE DURING THE ADJUSTMENT OF THE BRAKE
DANGER / RISK
BAN / WARNING
OBLIGATION / PREVENTION
Risk of crushing
in case of
contact with the rotation arm
when adjustments of the brake
are being made
Warning!
Exposure to moving
parts can cause danger.
• Adjustments of the brake must
be carried out by qualified
maintenance staff.
• Use of protective gloves and, if
necessary, safety harnesses.
•
The brake of the jib crane must be adjusted so as to guarantee the stability of the arm
in any of its positions with a maximum load.
•
The braking is mechanical and is ensured by two pushed clutch plates which with
adjusting screws work on a pressure plate, in contact with the rotation tube of the
arm.
•
The clutch plates, which are asbestos-free, are subject to wear in relation to the
intensity of service and when, after a period of use, there is a tendency of the arm to
take up preferred positions putting itself in different positions to those required when
the rotation action has not happened, adjustment must be made.
To adjust the brake of the arm of the jib crane proceed as follows:
WARNING! When this operation is carried out at a height, on a scaffolding or
other mobile equipment, the use of safety harnesses is obligatory.
1. Regulate the slidability of the rotation of the arm, using the braking system by means of the adjusster
screws
1
, until you obtain the required flexing sensitivity (fig. 100).
2. Carry out the check of planarity of the arm with the help of a level. Carry out such a check rotating the
arm by 90° to the left and to the right (fig. 101).
fig. 100
fig. 101
If the adjusatment of the brake has been made several times and after the last adjustment
the stability of the arm is not guaranteed, replace the clutch plates.
