Section XIII. DRIVE BELTS, ENGINE AND STARTER-GENERATOR
SHEAVE AND LIFTING BAR
Loosen the starter generator mounting nuts and
2-41. General
slide the starter generator toward the engine until
The three drive belts used to turn the starter
the belts are loose enough for removal.
generator during operation, and to turn the engine
c. Installation.
over during starting, ride on three-groove sheaves
(1) With the four nuts (fig. 2-19) loose, and the
mounted on the engine crankshaft and the starter
starter generator moved as close to the engine as
generator drive shaft.
possible, bring the loose ends of each drive belt over
2-42. Drive Belts
the loose sheave and insert into the proper grooves.
a. Tension Check and Adjustment.
(2) Check and adjust the drive belt tension (see
(1) To check the drive belts for proper tension,
above).
press the thumb down on each belt midway between
the two sheaves. If the tension is correct, each belt
will deflect approximately inch (fig. 2-19).
a. Removal. Proceed as follows when removing
either the engine or starter generator sheave:
NOTE
( 1 ) Loosen drive belts from sheave to be
If the tension on one or two of the belts is in-
removed (para 2-42).
correct, the adjustment procedure will not correct
(2) Remove two set screws (fig. 2-19) from
the trouble and one or more of the belts will
require replacement.
bushing.
(3) Insert one set screw into third hole which
(2) To adjust drive belt tension, loosen four
did not originally contain a set screw and tighten.
nuts in the slotted generator adapter plate (fig. 2-
This will loosen bushing.
19). Using a steel bar as a prying device, shift the
(4) Drive chisel into slot in bushing and lift out
starter generator position until drive belt tension is
bushing.
correct. Holding the steel bar in position to prevent
(5) Remove sheave and square key from
movement, tighten the four nuts.
crankshaft or generator adapter shaft.
(3) Recheck drive belt tension after ad-
b. Installation. Installation procedure for the
justment.
engine or starter sheave is the reverse of the removal
b. Removal. If one or more of the drive belts are
procedure.
worn, frayed, or cracked, replace the drive belt.
