Surface Machinery and Methods for Oil-Well Pumping Page: 101
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Mineral oils, grease, and acids destroy belt fabric and the com-
position cementing the plies together. Oil from the bearings of
the machinery sometimes gets on the belt. This should be prevented.
Burnt belts are generally caused by slipping. In leather belts a
burn shows as a hard unyielding spot; in canvas belts a burn
weakens the fabric; in balata belts it melts the inner composition
holding the plies together and thus loosens the plies.
Belts subjected to dust, sand, and dirt should be dusted or wiped
off frequently. Lumps on belts or pulleys are often caused by the
application of too much belt dressing, which mixes with dirt and
dust and solidifies. These lumps strain and injure the belt. The
improved service obtained by cleaning a
dirty belt always repays the effort.
Leather, cotton, or hair belts can be
cleaned by washing with two parts of BELT TIGHTENER
gasoline or naphtha and one part of tur-
pentine. Rubber and balata belts must
not be washed with this mixture, but
can be washed with soap and hot water. BELT CLAMP.
After the belt has been washed, any ad-
hering lumps of dirt or grease can be Clamp
scraped off with a dull knife or a flat
piece of steel. Belt
The application of a good belt dressing Rubber fillet
BELT SHOWING CLAMP CONNECTION.
recommended by the belt manufacturer
will help to keep the belt pliable, or lessen FIGURH 15.-Belt tightener and
slipping if it has stretched. A few drops belt clamp.
of castor oil is a good dressing for rubber or stitched canvas belts.
For leather belts, a melted mixture of two parts of beef tallow and
one part of cod liver oil is often used with good results. Frequent
and excessive use of castor oil will often make a belt crack. This
oil is one of the gummiest known, and as it dries, the gum forms,
hardens, cracks, and often cracks the belt fiber with it. Most manu-
facturers of belts do not advise the use of belt dressing.
A balanced load will materially increase the life of a belt. Most
operators are agreed that a belt will last much longer with motor
drive than with gas-engine drive. With the former a steady strain
is applied to the belt, whereas with the latter the belt is subjected
to a series of jerks corresponding to the explosions in the engine
INSTALLATION AND CARE OF BELTS.
When belts are applied to pulleys-especially leather belts, and
the standard 10-inch or 12-inch, five or six ply rubber, balata, and
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George, H. C. Surface Machinery and Methods for Oil-Well Pumping, report, 1925; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc12407/m1/130/: accessed May 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.