Servis automatic washing machine model number M3022/M - drive belt from motor to drum rides up drum pulley and comes off. Has belt stretched and need replacing or can tension be adjusted or is there another problem?
Check that the belt still has grooves for guiding and that these are not damaged. Alternatively check that the bearings in the drum are not causing the pulley to run out of true. Be careful to isolate the machine from the power supply before undertaking any work.
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