SWITCH BOXES, CONTROL, PANELS, AND DRY CELL, BATTERIES

TM 38-260

(5) Geared head motors. Fill the lubrication reservoir with preservative oil P-10, grade 30, of table 2-1. All

parts shall be completely covered by the preservative.

(6) Generator sets. Drain all fuel and engine coolant. Drain crankcase and fill with engine preservative oil.

Tag generator to drain and refill before placing in operation. Pour preservative oil in spark plug holes and replace spark

plugs. Seal the intake of the exhaust. Leave the coolant system empty and loosen the fan belt.

d. External surfaces. Repaint or touch up external painted surfaces, where needed. Preserve external bare metal

surfaces such as shafts, and couplings with preservative compound P-2, grade 2, of table 2-1.

e. Silicone-treated windings. Silicone-treated varnish is found principally in motors with a class "H" insulation.

These motors are expensive, and as a result are used only in those applications requiring extreme moisture resistance or

high temperature requirements. In general, any motor in which the name plate lists the rise in temperature of not less

than 167F (75C) higher or than 194F (90C), can be assumed to have class "H" insulation and silicone varnish on

its windings. These motors shall be treated in accordance with (1) below. Usually the varnish will be colored, however, it

may be found with a clear coating.

NOTE

CLEANING SILICONE-TREATED WINDINGS IS A SPECIAL CASE.

STANDARD

ORGANIC SOLVENTS INCLUDING PETROLEUM DISTILLATES GENERALLY USED FOR

CLEANING ELECTRIC MOTORS MAY ATTACK THE VARNISH AND SHALL NOT BE

USED. SILICONE-TREATED VARNISH WILL DISSOLVE IN THESE SOLVENTS.

The recommended procedure for' cleaning silicone-treated windings is to use water containing a detergent. The work

should be done as rapidly as possible. Excess moisture shall be wiped off with a clean dry cloth and the apparatus dried

immediately.

4-23. SWITCH BOXES, CONTROL, PANELS, AND DRY CELL, BATTERIES

a. Switch boxes and control panels shall be cleaned in accordance with MIL-P-116 process C-1 or C-3 as

NOTE

WHEN SOLVENT CLEANING IS USED ON THE ABOVE, IT WILL NOT COME IN CONTACT WITH WINDINGS,

INSULATION, AND OTHER WIRING. ELECTRICAL CIRCUITS SHALL BE PROTECTED FROM WATER MOISTURE

AND MILDEW WITH IGNITION VARNISH CONFORMING TO MIL-V-13811.

4-19