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MALFUNCTIONS, CAUSES AND REMEDIES

Service tips for the professional maintenance

V-BELTS

HARDENED, POLISHED EDGES


CAUSES
1. Pulleys do not align
2. Reinforcement damaged through improper assembly
3. Incorrect set combination

REMEDIES
1. Check drive, align non-aligned pulleys, and install a new belt set properly
2. Change belts and ensure professional assembly
3. Always replace the entire belt set

HEAVY DUTY WEAR ON EDGES, BRITTLE EDGES


CAUSES
1. Slip too great
2. Pulleys do not align
3. Rinsed pulley grooves

REMEDIES
1. Change belts, set correct tension
2. Check drive, align non-aligned pulleys, replace if necessary
3. Align or replace pulleys, change belts

BREAKAGE AND FRAYING IN THE BASE COMPOUND/PROFILE


CAUSES
1. Belt tensioning too high/low
2. Lifetime has been exceeded
3. Foreign objects

REMEDIES
1. Change belts
2. Set correct tension

RUNNING NOISE OF THE BELT


CAUSES
1. Tension too low
2. Lifetime has been exceeded

REMEDIES
1. Re-tension the belt or replace
2. Change belts

SOILING OF THE BELT


CAUSES
1. Leakage in engine or engine compartment
(e.g., escape of oil, antifreeze etc.)

REMEDIES
1. Remove leak, change belts

UNEVEN WEAR OF THE PROFILE


CAUSES
1. Pulleys do not align
2. Strong belt vibrations

REMEDIES
1. Check drive, align non-aligned pulleys, change belts if necessary
2. Check tension, re-tension the belts or replace if required

BELT CRACK AFTER SHORT RUNNING TIME


CAUSES
1. Reinforcement damaged due to improper assembly
2. Tension too high

REMEDIES
1. Change belts and ensure professional assembly
2. Change belts, set correct tension

HARDENED, POLISHED EDGES


CAUSES
1. Improper tensioning
2. Reinforcement of the belt damaged through improper assembly

REMEDIES
1. Change belts, set correct tension
2. Change belts and ensure professional assembly
3. Always replace complete set of belts

Timing belts

WEAR OF THE FABRIC OF THE BASE


CAUSES
1. Tension set too high
2. Worn timing belt pulley

REMEDIES
1. Change belts, set correct tension
2. Replace timing belt pulley, change belts and ensure professional assembly

WEAR OF THE TOOTH FLANKS /
SECTION BREAKS AND
TOOTH SHEARER


CAUSES
1. Tension too high / low
2. Foreign objects contamination
3. Fixed timing belt pulley and tension idler

REMEDIES
1. Change belts, set correct tension
2. Remove foreign objects, ensure the cover is sitting properly, change belts
3. Find causes (e. g., faulty storage) and create remedies, change belts

TEETH AND FABRIC DETACH FROM THE BASE COMPOUND


CAUSES
1. Leakage of engine or engine compartment
(e. g., escape of oil, antifreeze etc.)

REMEDIES
1. Remove leak, change belts

RUN MARKS ON THE TOOTHED SIDE


CAUSES
1. Foreign objects during timing belt operation
2. Imperfection on the toothing of the timing belt pulley caused by foreign objects or tools during assembly
3. Timing belts damaged before/during assembly

REMEDIES
1. Remove foreign objects, change belts, ensure the cover is sitting properly
2. Replace timing belt pulley, change belts and ensure professional assembly
3. Change belts and ensure professional assembly

FAULTY SYSTEM COMPONENTS


CAUSES
1. Bearing clearance
2. Damaged tread surface

REMEDIES
1. Replace guide roller, tension roller and/or guide roller
2. See REMEDY 1.

TIMING BELT RIPS


CAUSES
1. Foreign objects in the drive
2. Foreign media contamination
3. Pre-tension too high
4. Kinking the belt before or during assembly

REMEDIES
1. Remove foreign objects, change belts
2. Change belts, ensure the cover is sitting properly
3. Change belts, set correct tension
4. Change belts and ensure professional assembly

CRACKING


CAUSES
1. Ambient temperature too high/low
2. Foreign-media contamination
3. Stiff backside idler
4. Ageing

REMEDIES
1. Detect causes (e. g., cooling capacity test) and find remedies, change belts
2. Change belts, ensure the cover is sitting properly
3. Replace pulley, change belts
4. Change belts

WEAR ON EDGES


CAUSES
1. No axially parallel setting; belts run against flanged pulley
2. Wheels are not set axially or timing belt cannot run aligned
3. Flanged pulley has an imperfection bearing clearance of components
4. Clearance of component

REMEDIES
1. Check drive, align non-aligned pulleys and replace if necessary, change belts
2. See REMEDY 1.
3. Replace guide idler pulleys
4. See REMEDY 3.

NOISE


CAUSES
1. Tension too high: Belts screech, squeal
2. Tension too low: Belt hits against the cover

REMEDIES
1. Set correct tension
2. See REMEDY 1.

ribbed V-belts

HARDENED, POLISHED EDGES


CAUSES
1. Improper tensioning
2. Reinforcement of the belt damaged through improper assembly

REMEDIES
1. Change belts, set correct tension
2. Change belts and ensure professional assembly

BELT CRACK AFTER SHORT RUNNING TIME


CAUSES
1. Reinforcement of the belt damaged through improper assembly
2. Tension too high

REMEDIES
1. Change belts and ensure professional assembly
2. Change belts, set correct tension

BREAKAGE AND FRAYING BASE COMPOUND / PROFILE


CAUSES
1. Belt tensioning too high / low
2. Lifetime has been exceeded
3. Foreign objects

REMEDIES
1. Change belts, set correct tension
2. Change belts
3. See REMEDY 2.

FAULTY SYSTEM COMPONENTS


CAUSES
1. Bearing clearance
2. Damaged tread surface

REMEDIES
1. Replace tension and guide idler pulleys
2. See REMEDY 1.

UNEVEN WEAR OF THE PROFILE


CAUSES
1. Pulleys do not align
2. Strong belt vibrations

REMEDIES
1. Check drive, align non-aligned pulleys, change belts if necessary
2. Check tension, re-tesion the belts or replace if required

SOILING OF THE BELT


CAUSES
1. Leakage of engine or engine compartment
(e.g., escape of oil, antifreeze etc.)

REMEDIES
1. Remove leak, change belts

RUNNING NOISE OF THE BELT


CAUSES
1. Tension too low
2. Lifetime has been exceeded

REMEDIES
1. Re-tension the belt or replace
2. Change belts

SAFETY TIPS
  • Please observe installation regulations and safety instructions supplied by the manufacturer of the passenger vehicle.
  • Please only perform assembly of the drive belts with special tools and a minimum exertion of force! The use of screwdrivers, crowbars or the like is prohibited.
  • Do not treat the control unit components with corrosive chemicals. Belts must not come into contact with oil or similar substances.
  • Fill in the timing belt adhesive label legibly and stick it firmly in the engine compartment.
  • If individual components are faulty, the other components must also be replaced.
STORAGE
  • Store timing belts at +15 to +25 º C.
  • If stored properly, the level of quality will be maintained for years.
  • If stored improperly, e.g. through contamination of oxygen, light, extreme temperatures or moisture, the physical properties can change and the belts will become unusable.


Important
Until they are used, the drive belts should remain in their original packaging and stored free of any tension. When stacking, a height of 300 mm should not be exceeded or deformation may occur.