Martin Sprocket & Gear Screw Conveyor Safety - Manual (Page 17)

CEMA STANDARD NO: 352-2012
SECTION F – TROUBLESHOOTING GUIDE
13.
PROBLEM CAUSE REMEDY
FLIGHT THICKNESS TOO LIGHT
INCREASE FLIGHT THICKNESS. USE ABRASION
RESISTANT METERIALS OR HARDFACING
RPM TOO HIGH OR TROUGH LOADING
TOO HIGH
REDUCE SPEED. CONSULT CEMA 350 BOOK TO
DETERMINE RECOMMENDED SPEED AND TROUGH
LOADING.
INCORRECT ALIGNMENT
REALIGN TROUGH ASSEMBLY AND HANGERS IN
ACCORDANCE WITH ASSEMBLY SECTION OF THIS
DOCUMENT.
IMPROPER SPEED AND TROUGH
LOADING CONSULT CEMA 350 BOOK TO DETERMINE
RECOMMENDED SPEED AND TROUGH LOADING.
IMPROPER HANGER BEARING
MATERIAL CONSULT CEMA 350 BOOK TO DETERMINE
RECOMMENDED BEARING MATERIAL.
EXCESSIVE BEARING WEAR REPLACE HANGER BEARING.
TROUGH THICKNESS TOO LIGHT
INCREASE TROUGH THICKNESS.
USE ABRASION RESISTANT MATERIAL.
CONSULT CEMA 350 BOOK TO DETERMINE
RECOMMENDED TROUGH THICKNESS.
SCREW DEFLECTION
CONSULT CEMA 350 BOOK TO DETERMINE PROPER
PIPE SIZE AND SCRW LENGTH.
BENT SCREW STRAIGHTEN OR REPLACE SCREW.
INSUFFICIENT NUMBER OF COUPLING
BOLTS
INCREASE NUMBER OF COUPLING BOLTS
CONVEYOR SUBJECT TO FREQUENT
STOP/START
FREQUENT OVERLOADS
5. DRIVE SHAFT BREAKAGE EXCESSIVE TORQUE
CONSULT CEMA 350 BOOK TO DETERMINE PROPER
TORQUE RATING.
CEASE FREQUENT STOP/START. INCREASE BEARING
CAPACITY OF SHAFT AND/OR INCREASE NUMBER OF
COUPLING BOLTS
1. ACCELERATED FLIGHT WEAR
2. HANGER BEARING FAILURE
3. PREMATURE TROUGH FAILURE
4. SHAFT HOLE ELONGATION