Hothersal Trading has a national reputation for being a leader in the sale of V belts of all sizes and sections for a wide range of industrial and manufacturing establishments. Our staff is experienced in determining the section of the belt required and in making correct the measurement. In the rare case that a customer’s belt specification is not in stock, Hothersal will source the required belts to order right away. We carry the world renowned brand, Fenner.
Installation and Maintenance
Correct design of drives using Optibelt V-Belts ensures long belt life and a high degree of safety. Premature failure can often be traced back to faulty installation or maintenance, thus the following recommendations are very important
The grooves should be in good condition, free from scores or sharp edges, and all dimensions should conform to the relevant standard
Shafts and pulleys should be correctly aligned prior to belt installation
We recommend a maximum tolerance of + 1° in both planes
- Multiple V-Belt Drives
For multiple V-belt drives it is necessary to assemble the belts in matched sets either by measurement or by examination of the manufacturer’s code numbers or other markings. It may also be necessary to remeasure the belts if they have been stored for any length of time. Optibelt V-Belts in S=C plus construction may be used in matched sets without the need for reference to codemarks, measurement, or measurement after storage.
- Installation of the V-Belts
The drive centre distance should be reduced prior to the installation of belts so that they may be fitted without undue force. The severe stresses placed upon V-Belts if they are forced over the pulley flanges can damage the cover fabric and the high quality, low stretch tension members.
- Belt Tensioning
The drive should be tensioned correctly and retensioned as advised on the opposite page to compensate for the small initial belt stretch and “bedding” into the pulley grooves.
- Idler Pulleys
Where possible the use of idler pulleys should be avoided. If for design reasons, such an arrangement is necessary, then an inside idler should be used in preference to an outside idler. For other details refer to “The Optibelt Technical Manual”.
It is recommended that V-Belt drives should be regularly inspected for loss of belt tension, unusual heat build up or wear. Retension or replace when necessary.
Should an individual belt in a matched set require replacement for any reason, a complete new set must be fitted.
Belts from different manufacturers must not be mixed on the same drive.
Adapted from Optibelt Manual p5
|Belt breaking after fitting||Forcing belt over pulley when fitting, damaging cord and cover
Ingress of a foreign body, e.g. a stone, during running
Insufficient belts, or wrong section, for driveDrive stalled
|Reduce drive centre distance to fit belt
Fit an effective guardCheck drive details and fit correct number or section of belts
Ascertain cause and put right
|Cuts and splits in the base of the belt||Outside idler pulley in use
Pulley Diameter too small
Ambient temperatures too high (above + 70 °C/+ 158 °F)
Ambient temperatures too low (below -40 °C/ -40 °F)
Abnormal belt slip
Contamination by oil or chemicals
|Replace with inside idler pulley on the slack side if the drive. Increase the size of the existing idler.Redesign using recommended minimum pulley pitch diameters.
Ensure good ventilation and protect the belts from direct heat.
Warm area surrounding drive.
Check drive design to ensure correct number of belts, redesign if necessary. Check drive tension
Protect drive from contamination
|Belts turn over in pulleys||Poor drive alignment
Incorrect pulley groove section or excessive wear in grooves
Excessive belt flapLow belt tension
Worn out belts
Ingress of foreign body
Renew PulleysUse an inside idler on drive slack side
Use a more effective drive guard
|Excessive wear on belt flanks||Incorrect pulley groove angleIncorrect pulley section
Excessive wear in pulley grooves
Poor Drive alignment
Small pulley diameter below
Belt catching on protruding parts
|Renew or remachine pulleysRenew pulleys
Renew or remachine pulleys
Redesign using correct pulley diameters.
Remove protrusions or move drive away
Adapted from Optibelt Manual pp6&7