6. Maintenance and Repair
PNEG-2116
Bucket Elevator
43
Adjustment and Repair Procedure
Boot Take-Up (Belt Tension) Adjustment
states the InterSystems position regarding proper belt tension.
of in-service belt tension
explains how to adjust a screw take-up boot or how to add
weight to a gravity take-up boot.
Drive V-Belt (If Installed)
If the drive includes V-belts, there are several methods of measuring tension.
1. Direct reading using a gauge specifically designed to read belt tension. Consult a local industrial
V-belt supplier.
2. Indirect method using a pull hook scale and a straightedge. The engineering section of many catalogs
explains the procedure. In either event, most V-belt catalogs explain proper belt tensioning
procedures and give specific tension values.
Belt Tracking
Initial belt tracking
explains the recommended method of tracking the belt.
READ THIS FIRST
If a tracking problem exists and cannot be corrected by adjusting the boot take-up but instead requires that
the head and/or boot pulley shaft pillow blocks be shimmed, there may have been a shift in the elevator
structure. Look for the following conditions, in order of probability:
1. Worn or damaged pulley
2. Uneven belt stretch. Perhaps the belt is tearing along one edge. Check the splices.
3. Prolonged uneven infeeding of elevated material along one edge of belt or off center loading on the
boot.
4. Bent head or boot pulley shaft.
5. Bending or buckling of one or more elevator sections.
6. Damage to guy cable system or deadman shifting.
Belt Splicing
.
Throat Slide Adjustment
Refer to rubber throat slide adjustment
.
Roller Chain Tension
Many roller chain catalogs include instructions for properly tensioning roller chains and give specific
values. Excessive tension can cause accelerated chain and sprocket wear, destroy bearings, and bend
shafts. In extreme cases, excessive tension can cause structural damage.
