Martin Sprocket & Gear Screw Conveyor Safety - Manual (Page 15)

CEMA STANDARD NO: 352-2012
SECTION D – MAINTENANCE
Practice good housekeeping. Keep area around conveyor clean and free of obstacles to provide easy access and to avoid
interference with the function of the conveyor.
Establish routine periodic inspection of the entire conveyor to ensure continuous maximum operating performance.
LOCKOUT/TAGOUT ALL POWER BEFORE INSPECTION OF CONVEYORS. Periodic inspections should be made of the
following:
• Bearings – Check for proper lubrication. Lubricate all bearings in accordance with manufacturer’s instructions.
Check hanger bearings for proper alignment and excessive wear. Replace hanger bearings when wear exceeds 1/8
inch.
• Gear Reducers – Check for proper lubrication. Lubricate all gear reducers in accordance with manufacturer’s
instructions.
• Drives – Check for wear on belts and proper tension. Check for lubrication on chains and proper tension. Replace
belts or chains as necessary.
• Screws – Check for damage, excessive wear and material buildup. Replace screw sections as necessary.
• Troughs – Check for damage, excessive wear and material buildup. Check trough alignment using piano wire as
described in Assembly Section of this document. Replace trough sections as necessary.
• Shafts – Check for bolt hole elongation and wear. Check for run-out. Replace shafts when wear exceeds 1/8 inch.
• Seals – Check for leakage. Adjust seal or replace packing as necessary.
• Coupling Bolts – Check for wear. Replace worn coupling bolts as necessary. It is recommended to replace
coupling bolts and lock nuts when replacing screw sections. Torque ALL coupling bolts to proper torque rating.
Over tightening of coupling bolts could result in failure in tension. CEMA recommends tightening coupling bolts
to 75-percent of the values given in the Bolt Torque Guide to eliminate over tightening of coupling bolts.
• Assembly Bolts – Check for tightness. Torque ALL assembly bolts to proper torque rating per Chart A.
• Guards – Check for clearance and bolt tightness. Check oil level on oil-tight guards.
REPLACING SCREW CONVEYOR COMPONENTS:
1. LOCKOUT/TAGOUT ALL POWER
2. Removal of a screw section must proceed from the end opposite the drive or thrust unit.
3. Remove trough end, screw sections, coupling shafts and hangers until the damaged screw section is reached and
removed.
4. Reassemble conveyor components in accordance with the Assembly Section of this document.
NOTE: Quick disconnect screws can be removed at intermediate locations without first removing adjacent sections.
11.