Electro magnetic brake – 3370 Maintenance T-code 677, 678, 679
Valid from serial number 723984-
Date 2005-10-28
Order number 222995-040
12.2 Maintenance Basically the brake is maintenance free in normal work environments. However it is recommended according to the preventive maintenance schedule to check the brake disc for wear and the gap between the magnetic coil housing and the pressure plate on a regular basis.
12.2.1 Basic Adjustment of gap 9,5 Nm
0,3
The nominal gap between the coil housing and the pressure plate, in applied position, shall be 0.3 mm. The maximum gap before readjustment is necessary is 0.8 mm.
Adjustment: • Loosen the tension of the three mounting bolts . • Turn the lock nuts anti-clockwise and tighten the bolts slightly while checking the gap on three points with a 0.3 mm feeler gauge. • Tighten the mounting bolts 9,5 Nm and recheck the gap with the feeler gauge.
12.2.2 Exchange of brake disc The brake disc shall be exchanged when its total thickness has been reduced to 6 mm. • Disconnect the electrical wires of the brake. • Loosen and remove the three mounting bolts and remove the brake coil. • Replace the brake disc on the hub and make a visual inspection of the wear of the friction plate. Replace the friction plate if the surface is worn uneven. • Unwind the lock nuts on the coil at least 6 mm to make sure there is a gap between the coil and the pressure plate when the coil is refitted. • Mount the coil on the motor end and carry out adjustment of the gap according to chapter “Basic Adjustment of gap”. • Reconnect the electrical wiring 12- 2
Service Manual
7PM18, 7PM20, 7PML20
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