to remove and install belts without the use of force. Never use a screwdriver or other
lever to force belts onto sheaves. Check multiple belts for matching size and length. It
is not good practice to replace only one V-belt on a multiple belt assembly. Instead,
replace the complete set with a set of matching belts. After belts are installed, adjust
the tension. Recheck the tension after 8 hours of operation.
Checking Tension. Check belt tension each week and adjust, as
required, to prevent slipping or excessive wear on the belts.
Right-Angle Gear Drives. O&M procedures for right-angle gear drives
should follow manufacturer's recommendations. Immediately after starting a right-angle
gear drive, remove the inspection plate and check for proper flow of lubricant. If there
is no flow, stop the motion and check for mechanical defects. If no mechanical defect
is found, it may be necessary to change the lubricant or drain and warm the old
lubricant. Temperature or service conditions may require changing the lubricant type.
To avoid detrimental effects of possible water-oil emulsion, drain old oil and refill with
fresh recommended lubricant quarterly or about every 500 hours of operation,
whichever is more frequent. The choice of lubricant depends on prevailing air
temperatures and the manufacturer's recommendations.
O&M for Variable-Speed Drives. Variable-speed drives are commonly
used in water systems. Designs vary considerably from manufacturer to manufacturer.
Therefore, consult the manufacturer's manual to determine O&M requirements. Items
common to most variable-speed drives are listed below.
Check for Normal Operation. Observe the drive each shift and
note any abnormal conditions.
Clean Discs. Remove grease, acid, and water from the disc face
and thoroughly dry it. Use clear solvents that leave no residue.
Check Speed-Change Mechanisms. Shift drive through the entire
speed range to make sure that shafts and bearings are lubricated and discs move
freely in a lateral direction on shafts.
Check V-Belt. Make sure the belt runs level and true. If one side
rides high, a disc is sticking on the shaft because of insufficient lubrication or the wrong
lubricant. In that case, stop the drive, remove the V-belt, and clean the disc and shaft
thoroughly with kerosene until the disc moves freely.