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| | SELECTING PULLEY TYPES | Select the pulley type to fit the application. Use cast iron and machined from bar stock types for heavy duty applications. Stamped steel are commonly used with outdoor power equipment and lawn & garden equipment. Use die cast in light duty applications
Use A type pulleys with A or 4L (1/2" wide) belts; B type with B or 5L (5/8" wide) belts. Combination groove pulleys can be used in many applications, but not all. The A/B type can be used with either a B (5L) or A (4L) belt, the smaller belt will ride deeper in the groove. "O" or A/O pulleys can be used with O or 3L (3/8" wide) belts. |
| DETERMINING PULLEY SIZES | When retrofitting or designing a new pulley drive it is important that the equipment operate at the recommended speed. The ratio of the pulley outside diameters determines the speed ratio
Refer to the Speed Ratio Chart
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| USING IDLER PULLEYS | Idler pulleys are used to take up slack, change direction of transmission, or for clutching action.
Idler failure usually cccures when the bearing fails due to lack of lubrication or the presence of foreign particles. Idlers with precision ground double sealed bearings usually will last longer than other types.
Use bushings to reduce idler bores. If bushing is too tight to insert by hand GENTLY tap with hammer USING SUPPORT UNDER INNER RACE OF BEARING. Bushings are available with or without shoulders. If bushing is loose in bore, use Loctite or make a scratch mark on bushing with file. |
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| SAFETY TIPS | Before inspecting or changing belt drives turn the equipment off and lock the controls if possible.
Never try to pry or roll belts into the pulley groove because your hand could be pinched between belt and pulley.
Always install guards before operating equipment to keep hands or clothing from being caught in the drive.
Never operate belt drives above recommended speeds because serious damage to personnel or equipment bould result.
Don't operate equipment where pulleys and belts are badly out of alignment because the belt could slip off the pulley.
Wear gloves to avoid cutting your fingers on sharp metal edges when inspectngn or changing belts or pulleys. First be certain equipment is turned off. |
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| INSTALLING BELTS AND PULLEYS | The procedures outlined in your equuipment service manual should be followed carefully. The following tips may also be helpful:
Remove dust, dirt, grit, and rust. If an idler is involved make sure it turns easily.
Remove any buildup of paint or rust in the pulley grooves to prevent belt slippage and belt ware.
Replace pulleys which show wear along the sides which can result in increased slippage and shorter belt life.
Replace all old belts with new belts of the same make or brand so the loads will be equally distributed.
When changing belts move the pulleys closer together by adjusting the drive tension adjustment or more the takeup or idler pulley out of the way so the belt will simply slip into place.
Check pulley and belt alignment using straightedge against outside edges of both pulleys. All edges of both pulleys should touch the straightedge.
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