PREVOST BAL-F Manuel D'utilisateur page 9

Warning! For all balancers that do not have a suspension hook, make sure that it is fixed to the main
structure in such a way as not to block the movements (oscillations and rotations) which are functional
to the correct operation of the balancer itself.
Always connect the safety suspension S, using exclusively the supplied standard fittings (Fig.1),
to a suitably sized support.
The safety support MUST NOT BE the same one used for the main suspension 17 (Fig.1). If the main suspension
breaks, the max falling distance must not be more than 100 mm. Tighten the nuts of the clamps 20331 (Fig.1) at a
torque of 4 Nm.
To avoid anomalous wear, the load must be applied vertically and in any case the cable must be free to line up with
the direction of the load.
Using the balancer
Grip the tool hanging from the balancer and carry out the required operations. Then accompany the tool until it
balances, on the vertical line of the balancer, and release it.
The load to be balanced must be hung on snap-hook 31 (Fig.5). Ensure that the snap-hook is properly closed
after having hung the load.
The cable must never be unwound all the way: its work travel must end at least 100 mm before it reaches the
lower limit (balancers series F are fitted with an automatic limit stop system).
If need be, move and lock the clamp 29/30 (Fig.5) to stop the upward stroke.
When using the balancer, always don individual protective gear and closely adhere to the prevailing accident
prevention regulations.
It is strictly prohibited to:
- Abandon the load if it is not in a vertical position
- Swing/throw the hanging load to another operator
- Move the load by pulling the balancer's cable
- Hang loads that are not within the upper and lower ranges of the admissible load-bearing capacity
- Hang more than one tool on the balancer.
The sole risk linked to the use of the balancer consists in any uncontrolled rewinding of the cable. This
very dangerous event will be avoided by adhering to the following instructions:
- if you have any doubts concerning the working efficiency of the balancer, BEFORE performing any kind
of inspection be sure to hold up the hanging tool to prevent it from falling and DISCHARGE THE SPRING
COMPLETELY
- if for any reason whatsoever the balancer does not rewind the cable, DO NOT do anything on your own initiative
but contact the customer service at once
- never release the load if the cable has not been fully wound in the drum
- if the balancer's cable is unwound and no load applied to it, DO NOT do anything on your own initiative but
contact customer service at once.
Adjusting the balancer
To enable the balancer to balance heavier loads, use the specific key to turn screw 45 (Fig. 5) in the direction
indicated by symbol "+". For lighter loads, turn screw 45 (Fig. 5) in the direction indicated by symbol "-".
After having adjusted the load, check that the cable slides freely for its entire length: the movement must not be
restricted when the spring has wound all the way. Check the stroke often and at different speeds.
NOTE: should the balancer's capacity of supporting a hanging load decrease, this could mean that the
spring of the drum is about to break. DO NOT MODIFY BALANCER ADJUSTMENT TO MAKE IT HOLD
UP THE LOAD IN ALL CASES BUT CONTACT SKILLED PERSONNEL IN CHARGE OF MAINTENANCE
AT ONCE.
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