JIB CRANES WITH AN ARTICULATED ARM MANUALLY ROTATED
JIB CRANES WITH AN ARTICULATED ARM MANUALLY ROTATED
JIB CRANES WITH AN ARTICULATED ARM MANUALLY ROTATED
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DONATI SOLLEVAMENTI S.r.l. - Via Roma, 55 - 21020 Daverio (VA) - Tel. 0332 942611 - Fax. 0332 948597<br />
6.4 Adjusting and regulating<br />
6.4.1 Adjusting the rotation brake of the crane arm<br />
REMAINING RISKS IF ON THE CR<strong>AN</strong>E DURING THE ADJUSTMENT OF THE BRAKE<br />
D<strong>AN</strong>GER / RISK<br />
Risk of crushing in case of<br />
contact with the rotation arm<br />
when adjustments of the brake<br />
are being made.<br />
B<strong>AN</strong> / WARNING<br />
Warning! Exposure to moving<br />
parts can cause danger.<br />
55<br />
OBLIGATION / PREVENTION<br />
• Adjustments of the brake must be<br />
carried out by qualified<br />
maintenance staff.<br />
• Use of protective gloves and, if<br />
necessary, safety harnesses.<br />
• The brake of the jib crane must be adjusted so as to guarantee the stability of the<br />
arm in any of its positions with a maximum load.<br />
• The braking is mechanical and is ensured by two pushed clutch plates which with<br />
adjusting screws work on a pressure plate, in contact with the rotation tube of the<br />
arm.<br />
• The clutch plates, which are asbestos-free, are subject to wear in relation to the<br />
intensity of service and when, after a period of use, there is a tendency of the arm to<br />
take up preferred positions putting itself in different positions to those required<br />
when the rotation action has not happened, adjustment must be made.<br />
To adjust the brake of the arm of the jib crane proceed as follows:<br />
WARNING! When this operation is carried out at a height, on a scaffolding or<br />
other mobile equipment, the use of safety harnesses is obligatory.<br />
1. Regulate the slidability of the rotation of the arm, using the braking system by means of the<br />
adjusster screws 1 ( fig.55 ).<br />
2. Carry out the check of planarity of the arm with the help of a level. Carry out such a check rotating<br />
the arm by 90° to the left and to the right ( fig.56 ).<br />
fig.55<br />
fig.56<br />
If the adjusatment of the brake has been made several times and after the last<br />
adjustment the stability of the arm is not guaranteed, replace the clutch plates.