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 TM 55-1905-220-14-5
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.
3-1198
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