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Inspection and Maintenance
AC Motors
Examine the collector rings, brushes, brush holders and studs for cleanliness and wear. Collector rings
should maintain their polished surface. Brushes should move freely within their holders, but set firmly
in contact with the collector rings. Be sure the pigtail conductors are securely fastened to the brush hold-
ers. Check the insulation for cleanliness and wear.
Check the vibration of the motor while it is coupled to the pump. The vibration should not exceed 3 mils
(0.08 m). Check the cooling passages and louvers of the motor to make sure they are clean, undamaged
and unobstructed. Check rpm of motor with mechanical or Reed type tack and compare to nameplate.
COUPLINGS
Inspect couplings between motors and/or between motors and pumps for deterioration, missing or loose
hardware and cleanliness. Refer to the Service Manual under systems noted for further information.
UNIT PIPING SYSTEMS
Oil, Water and Air
A walk around visual inspection should be made to check piping systems for leaks, loose hardware, loose
hangers, leaky gaskets, valve packing leaks, vibration of piping, vents are functioning and a general
check for security of the systems. Corrective action should be taken to correct any abnormalities found.
LUBE SYSTEMS MAINTENANCE
Lube System Oil Pumps
Check the lube oil pumps for excessive vibration. Check the thrust bearings and bearing seal for wear.
Check the clearance of the wear ring. If wear has increased this clearance to 0.016 in. (0.041 cm), the
wear ring should be replaced.
Lube Oil Tank
Check the internal tubing and piping of the lube oil tank for peeling of paint and loose fittings. Check
the pipe hangers for loose or missing hardware. Carefully inspect each pump intake screen (especially
on the main pump) for foreign material and loose hardware. Check the sludge removed from the bottom
of the tank for the presence of unusual material. Make sure the inside of the tank is thoroughly clean
before refilling.
Lube Oil Properties
For instructions on determining lube oil physical properties and periodic sampling and testing, refer to
the Fluid Specifications Tab in Volume II of the Service Manual.
Heat Exchangers
Check the heat exchanger for leakage, efficient operation and foreign matter contamination. Exchangers
are subject to fouling (scale, sludge deposits, etc.) and should be cleaned periodically, depending on spe-
Inspection and Maintenance Procedures
IMP–7
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