63 HOW TO TRACK OR TRAIN A BELT Before installing belt: ALL pulleys, snubs, idlers and structure must be square for prop- er belt alignment. All foreign material should be removed from pulleys and idlers. Replace lag- ging if needed. Installbelt: Operate under tension for a minimum of two (2) hours before mak- ing adjustments (Unless there is a severe problem). This will allow tem- porary mal-distri- bution of tension in belt to even itself out. Adjust idlers only: Pulleys and snubs have very little positive effect in training. (Unless the problem is obvious.) Train by knocking ahead (2° max) the end of the idler to which the belt rides. This should be done over a rea- sonable length of the conveyor pre- ceding the problem area. If the above meth- od does not solve your problem – contact factory for further technical information. Below are some conveyor belt problems, and some of their causes and solutions. Beltservice handles many questions regarding belting problems on a daily basis. If you are having a problem, give us a call, and we’ll be happy to help. Vulcanized splice delamination or failure 1. Pulley too small — check recommended minimum for belt 2. Belt running wrong direction — check for manufacturer’s arrow or make sure leading edge of splice contacts pulley first 3. Reverse bend — use thinner belt 4. Too much tension for belt — use heavier construction Belt does not track properly 1. Pulleys and/or idlers NOT squared 2. New belt not “run in” long enough 3. Uneven loading — load off center 4. Structure not square 5. Lacing or splice not square 6. Bow in belt Cleats cracking at base 1. Pulleys too small Cleat delamination 1. Pulleys too small — check minimums for cleat type 2. Return idlers hitting cleats 3. Material conveyed affecting bond (oils, acids, etc.) 4. Product overload 5. Poor tracking — cleat edges repeatedly hitting conveyor frame Flange delamination or cracking 1. Pulley is too small — check minimum for flange height. Sipe, sipe and drill, or notch for small pulleys. V-guide delamination or cracking 1. Pulley too small — notch for small pulleys 2. Severe misalignment 3. Wrong size cross section for pulley groove Fastener pullout 1. Wrong size fastener 2. Fastener not installed properly 3. Obstruction touching splice area 4. Poor tracking — splice hitting conveyor frame Severe edge wear 1. Pulleys, idlers or structure not square 2. Worn pulley lagging 3. Offset loading conditions 4. Load off center Excessive belt stretch 1. Too much tension for belt being used — go to a stronger belt 2. Insufficient take-up 3. Overtightening of take-up Excessive belt slip 1. Tighten take-up or pulley 2. Lag or replace worn lagging 3. Pulleys too small — not enough wrap — use lighter belt or larger pulley 4. Material spillage — lag pulleys and/or install cleaning devices Elevator bolt pull-out 1. Bolt not tight — tighten monthly 2. Bucket hung up in boot 3. Belt tension too low causing elongation of holes 4. Adverse conditions — heat, oil, acids Trouble Shooting CONVEYOR BELTING TROUBLE SHOOTING