16
GB
6.5 - Brake Inspection & Adjustment
NOTE : Any brake adjustment must be performed with the hoist unloaded.
As the hoist is used, wear of the brake linings may cause the hoist to slip and not hold the load. If slipping occurs, the load should be
immediately lowered to the ground. The brake should be checked and adjusted by a qualified person or repair shop who is approved by
TRACTEL to work on the electric hoist.
Specifications:
• The normal gap between the disc support plate linings and the solenoid is between 0.5 to 1 mm (0.20 to 0.040 in.) maximum.
• In normal working conditions, the brake working time is between 1000 to 1500 hours before needing adjustment.
NOTE : For preliminary check of brake wear, you will need 0.5 mm and 1 mm (0.020 in. and 0.040 in.) spacers.
1) Insert the 0.5 mm (0.020 in.) spacer between the disc support plate(#2) and the solenoid(#1). If the spacer DOES NOT fit,
the brake gap is not wide enough. Continue to the “Brake Gap Adjustment Procedure”.
2) Insert the 1.0 mm (0.040 in.) spacer between the disc support plate(#2) and the solenoid(#1). If the spacer DOES fit, the
brake gap is too wide or the brake is worn down excessively. Continue to the “Brake Gap Adjustment Procedure”.
CAUTION
Never put oil or grease on the brake friction surface. Wipe off and clean any trace of lubricant which may be observed.
Brake Gap Adjustment
1) Disconnect the power supply from the hoist.
2) Open the hoist by removing the cover opposite to the power supply. The brake is on the right side.
3) Remove the two safety plates (#3) by unscrewing the four fixing screws and washers(#4).
4) Insert a 0.5 mm spacer between the solenoid (#1) and the support plate (#2). Tighten the four adjusting screws with nuts
item(#5) in the same way. The gap is then correctly adjusted.
5) Release the four adjusting screws (#5) by 1/6 of a turn and remove the spacer. Tighten again the four screws (#5)by 1/6 of
a turn to put them back into position.
6) Reposition the two safety plates (#3) and tighten the four fixing screws and washers(#4).
7) Replace the cover and connect the hoist to its power supply.
NOTE : Badly worn, scratched, or deformed brake discs must be replaced. Refer to the “Brake Disc. Replacement
Procedure” on the next page.
Brake Disc Replacement
1) Disconnect the power supply from the hoist
2) Put the hoist frame in vertical position in order to get the brake assembly in horizontal position.
3) Remove the two safety plates (#24.6) by unscrewing the four fixing screws and washers (#24.7/24.8).
4) Remove the four nuts (#24.9) which will allow you to slide out the solenoid (#24.10) and the eight springs (#24.4/24.5). When
you remove the solenoid, be careful not to damage the electrical wires.
5) Remove the disc support plate (#24.3) and then the brake disc (#24.2).
6) Fit the new brake disc and brake assembly.
7) Re-adjust the brake gap (refer to the “Brake Gap Adjustment Procedure”). A normal gap should be between 0.5 to 1 mm
(0.020 to 0.040 in).
8) Reposition the two safety plates (#24.6) and tighten the four fixing screws and washers (#24.7/24.8).
NOTE : If after the brake adjustment the gap between the solenoid and the disc support plate remains greater than
1mm (0.040 in.), the brake disc must be replaced.
6.6. Table of inspections and lubrication checks
The checks mentioned in the following table are additional to the periodic inspections required by National / provincial or local norms or
regulations. This table is given for information only, for use of the hoist on his normal duty factor, for normal operating conditions.
Inspections should be performed more frequently if the equipment is used for heavy or severe service, or is constantly operated at or
near maximum rated load.
See page 18
6.7. Friction clutch adjustment
It is a very serious operation who must be performed by a specialist only. The friction clutch is a safety device and it has been design
to protect the machine against overload.
The Factory set is between 110% min to 160% max of the W.L.L.. According to EN regulation.
The User of the hoist or hoist with drive trolley is not allow to use the machine to lift a load over the W.L.L.
Lifting more than the W.L.L is strictly forbidden
The user of the hoist or hoist with drive trolley must respect the W.L.L. written on the side plate.
The friction clutch adjustment should be done by a service center registered by TRACTEL GROUP
The friction clutch can only be adjusted with a special tool. (Please contact the nearest TRACTEL MAINTENANCE OFFICE).
