Not Scheduled. Disassemble pump if there is a reduction in capacity or pressure, an increase in vibration,
or other indication that a problem exists or at intervals determined by past maintenance experience. Check
for worn parts and repair or replace as required.
16. Shaft and Coupling
Weekly. Check shaft and coupling visually for excessive runout or vibration. Look for loose coupling bolts
or other damaged coupling components. Lubricate if required.
Annual. Check shaft runout with dial indicator or with proximity probes. Check shaft alignment if runout
Weekly. Check for excessive heat and for proper amount of leakage. Tighten packing as required.
Not Scheduled. Remove old packing and lantern ring and thoroughly clean packing box. Check packing
sleeve for excessive wear and repair or replace as required. Install new packing, staggering adjacent rings
so that joints do not coincide.
18. Mechanical Seals
Weekly. Check for excessive leakage. Properly installed mechanical seals should require very little
maintenance. When excessive leakage does occur, it normally is an indication that new seals are required.
Weekly. Check for vibration and for adequate lubrication. Prior to complete failure, vibration will
increase, and the bearing will usually become extremely noisy. As it is sometimes difficult to detect an
increase in noise or vibration, some sort of vibration monitoring system can be helpful. If a bearing fails
prematurely, determine cause and correct it before restarting the pump. Insufficient or excessive
lubrication, contamination of the lubricant, or misalignment of the shaft or bearings are some possible
causes of premature bearing failure.
20. Pressure Relief Valves
Annual. All positive displacement pumps, such as in hydraulic systems, must have a pressure relief valve
installed in its discharge line ahead of any valve or obstruction that could restrict flow. In some pumps, the
relief valve is an integral part of the pump. Test all relief valves for proper operation and setting.
Not Scheduled. Disassemble and clean any scale or rust build up from nozzle, eductor body, and
piping. Repair or replace nozzle if damaged by corrosion or cavitation.