Installation and Maintenance Manual
GEI-M1031-B
14
V. MAINTENANCE (cont’d)
B. Insulation and Windings (cont’d)
3. Cleaning with Water and Detergent
This method is very effective in cleaning windings when used with a low-pressure steam
jenny (maximum steam flow 30 psi and 90C).
If a steam jenny is not available, the cleaning solution may be applied with warm water
by a spray gun. After the cleaning operation, the windings should be rinsed with water or
low-pressure steam.
It is advisable to dry the windings. Refer to Insulation Resistance section for instructions
on how to proceed.
4. Cleaning with Solvents
Although cleaning with water and detergent is the preferred method, solvent cleaning
may be used when heat drying facilities are not available.
Mineral spirits are recommended for use as the cleaning solvent. Solvent cleaning of
silicone-insulated windings, leads, and space heaters is not recommended.
Windings cleaned with solvent should be dried thoroughly by circulation of dry air before
voltage is applied.
5. Revarnishing Windings
After several cleanings with water and detergent, it may be necessary to revarnish the
windings. This varnish is available from the General Electric Company or a GE Authorized
Service Shop.
C. Lubrication and Bearings
1. Anti-Friction Bearing Relubrication and Maintenance
The grease used as a lubricant in grease-lubricated anti-friction ball bearings loses its
lubricating ability over a period of time. For a given bearing construction and assembly,
the lubricating ability of a grease with age depends primarily on the type of grease, the
size of the bearing, the speed at which the bearing operates, and the severity of
operating conditions. As a result, it is not possible to accurately predetermine when new
grease must be added. Good results can be obtained if the general recommendations
stated in this instruction book are followed.
To minimize possible damage to varnish and insulation, a fairly neutral non-conducting
detergent should be used.
Warning
Many cleaning fluids are flammable and/or toxic. To prevent injury to personnel and
property, care should be taken to avoid flames, sparks, etc. Safety glasses should be
used and contact with the skin should be avoided. The area should be well ventilated or
protective equipment should be used.
Warning
Mineral spirits should be used only in a well-ventilated area that is free from open
flames. Avoid prolonged exposure to vapor. Failure to observe these precautions may
result in injury to personnel.
Caution