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 TM 55-1905-219-14-5
3-66.3. SYNCHRONIZING MOTOR - MAINTENANCE INSTRUCTIONS (Cont).
c. OPERATION.
(1) The synchronizing motor is used to change the engine speed when the unit is running alone, or to adjust the load when the
unit is operating in parallel with other units.
(2) When the two-way control switch on the Main Switchboard is closed, the motor shaft turns the governor speed adjusting
shaft by means of the reduction gear and friction drive. The direction of rotation (clockwise or counter-clockwise) is dependent upon the
position of the switch. When the desired engine speed is indicated on a tachometer or frequency meter on the switchboard, the switch
is returned to the OFF position by the operator.
(3) If the switch is held in the LOWER speed position too long, the synchronizing motor will continue to lower the engine speed
until it ultimately shuts the engine down. If the switch is held too long in the RAISE speed position, the motor will turn the governor
speed adjusting shaft until it strikes the maximum speed adjusting screw, after which the friction drive will slip and the motor will
continue to run at a slightly reduced speed without further effect.
d. SERVICE.
(1) The synchronizing motor is constructed to render long satisfactory service. However, if the motor is damaged or fails to
operate, replace the entire motor as an assembly.
(2) The spring washer of the friction drive or slip-clutch must be strong enough to permit the motor to carry the speed adjusting
lever up against the maximum speed adjusting screw without slipping, yet it must be loose enough to slip after the lever contacts the
screw.
3-1216
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