
52
5 Design Hints, Dimensions and Tolerances
5.6 Problems, causes, remedies
Drive system problems can significantly impair the efficiency and
service life of the timing belt. After correcting any problems it is
advisable to replace the timing belt.
Table 5.14: Problems, causes, remedies
Problem
Cause
Remedy
Severe wear on the
belt tooth flanks
Incorrect belt tension
Belt geometry incorrect
Pulley geometry incorrect
Overload, drive underdimensioned
Recalculate belt tension and reset
Use correct belt(s)
Use correct pulley
Reduce load or redesign drive
Belts jumping teeth
on the pulleys
Belt tension insufficient
Overload,
drive underdimensioned
Unacceptable horizontal and/or vertical
angular deviation of shafts
Foreign matter ingress
Reset belt tension to calculated level
Reduce load or redesign drive
Realign shafts and pulleys
Remove source of contamination or
redesign guards
Excessive wear of the tops and
bottoms of the belt teeth
Excessive belt tension
Incorrect pulleys
Reset belt tension to calculated level
Replace pulley(s)
Unacceptable axial offset of pulleys,
unacceptable horizontal and/or vertical
angular alignment of shafts
Motor or machine mounting
too flexible
Defective flange
Re-align shafts and pulleys
Strengthen components and tighten
mountings
Replace flange
Unusual wear on the belt sides
Screen drive system, select different top
surface
Effects of contamination
(see Table 1.4, page 9)
Swelling of the special surface
laid on top of the belt
Protect drive, remove contamination
Effects of contamination
(see page 15 and page 42)
Belt swelling
Cracks in the special surface
laid on top of the belt
Excessive ambient temperature
(see Table 1.4, page 9)
Protect drive or remove contamination,
change to another special surface
Cracks in the belt top surface
Ambient temperature above + 80
°
C or
below – 30
°
C
Protect belt, induce cooling air flow
Use better quality pulleys
Use correct belt(s)
Use correct pulley(s)
Pulleys made from unsuitable material
Belt geometry incorrect
Pulley geometry incorrect
Unusual wear on pulley
Pulley
flanges
becoming detached
Incorrect installation of flange
Unacceptable axial offset of pulleys,
unacceptable horizontal and/or vertical
angular deviation of shafts
Install flange correctly
Realign shafts and pulleys
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